ICS 13.220.20  
C 81  
                                                         GB 
National Standard of the People’s Republic of China   
    GB15631 –– 200X  
Replaces GB15631 -1995  
_______________________________________________________________  
 
  
Special type fi re detectors  
 
 
(Revised) (Draft for Approval)  
 
 
 
 
 
 
 
Issue Date: ×××× -××-××                     Implementation Date:  ×××× -××-×× 
____________________________________________________________________  
 
 
Issued by the General Administration of Quality Supervisi on, Inspection and 
Quarantine, The People’s Republic of China  (AQSIQ) and the  
Standardisation Administration of the People's Republic of China  (SAC)  
 Contents  
 
Foreword …………………………………………………………….……………I1  
1   Scope ……………………………………………………………………….. 1  
2   Normativ e references ……………………………………………………….. 1  
3   Classification ……………………..………………………………………… 1  
4   Technical requirements ……………………………………………………… 1  
5   Test methods ………………………………………………………………… 11  
6   Inspection rules ……………...……………………………………………… 31  
7   Markings …………………… ………………………………………………. 32  
Annex A (Normative annex) Gas inspection devices …………………………….. 34  
Annex B (Normative annex) Gas sensors …………..……………………………. 35  Foreword  
      
Subsections 4, 5, 6 and 7 of this Standard are mandatory, whilst the rest are 
recommended.  
This Standard replaces GB 15631 -1995, “ Performance requirements and test 
methods for point infrared flame detectors .” The main changes to this Standard when 
compared with GB 15631 -1995  are as follows:  
––the technical requirements for aspirated smoke detec tors, image -type fire 
detectors and point -type carbon monoxide detectors have been increased;  
–– the latest version of electromagnetic compatibility requirements have been 
adopted and the appropriate severity classification for connection with the 
internat ional world has been selected.  
Annex A and Annex B to this Standard are normative annexes.  
This Standard was proposed by the Ministry of Public Security of the People’s 
Republic of China  
This Standard is under the jurisdiction of the 6th Branch Technical C ommittee 
of the National Technical Committee for Fire Protection Standardisation.  
The unit responsible for drafting this Standard is the Shengyang Fire Research 
Institute, the Ministry of Public Security . 
The units that participated in drafting this Standa rd are Anhui Fire Station, 
Xi-an Bokang Electronics Co., Ltd., Shenzhen Forsafe System Technology Co., Ltd., 
and KD Lian Safety Technology  Co., Ltd.  
The main drafters of this Standard are: Hongjun Ding, Li Qu, Baodong Dou, 
Chunlei Guo, Hongyong Yuan, Yinzo ng Zhang, Xuejun, Zhang, Chunxiang Cao, 
Wenching Wang, Liwei Song, Zhihbin Mei, Haitao Li, Ningning Li, Shuang Sun, Rui 
Li and Lihong Zheng.  
     This Standard replaces the following previously issued version of the Standard:  
     –– GB15631 -1995.  Special  Type Fire Detectors  
 
1   Scope  
 
     This Standard sets the classifications, technical requirements, test methods, 
inspection rules , markings and user manual requirements for  the special type fire 
detectors  (hereinafter referred to as “detectors”) . 
     This standard applies to special type fire detectors installed in general industry 
and civil architectures.  This Standard also applies to special type fire detectors  
requiring special installation for  use in other environments, with the exception of 
special  performances specified by other relat ed standard s. 
 
2   Normative references  
 
     The provisions of the following documents become provisions of this Standard 
after being referenced. For dated reference documents, all later amendments 
(excluding corrigen da) and revised versions do not apply to this Standard. However, 
the parties to the agreement are encouraged to study whether the latest version of 
these documents applies. For undated reference documents, the latest versions apply.  
     GB  4706.1 -1998 Safety of household and similar electrical appliances  –– Part 1:  
General requirements  (Eqv. IEC335 -1: 1991)  
     GB 9969.1 General principles for preparation of instructions for use of 
industrial products  
     GB 12978 Rules for product test of fire alarm equ ipments  
     GB 16838 Environmental test methods and severities for fire electronic 
products  
 
3   Classification  
 
3.1   According to the detection principles, special type fire detectors can be 
classified as:  
     a) point -type infrared flame detectors ; 
b) aspirated smoke detectors;  
c) image -type fire detectors;  
d) point -type carbon monoxide detectors.  
 
 3.2   According to the ways in which they are used, point -type carbon monoxide 
detectors can be classified as:  
     a) independent type;  
     b) systematic  type.  
3.3   According to the range of response threshold values, aspirated smoke detectors 
can be classified as:  
     a) general type;  
     b) sensitive type;  
     c) highly sensitive type.  
3.4   According to function formation, aspirated smoke detectors can be classified 
as: 
     a) detection type;  
     b) detection alarm type.  
 
3.5   According to sampling methods, aspirated smoke detectors can be classified as:  
     a) pipe -sampling type;  
     b) point -sampling type.  
 
4   Technical requirements  
 
4.1   Re quirements for general use  
4.1.1   Alarm confirmation light  
     The detector should possess a red alarm confirmation light. When the fire 
parameters in the zone under surveillance meet the alarm conditions, the alarm 
confirmation light of the detector sho uld be turned on and remain on until restoration.  
With regard to the displaying of other functional modes of the detector through the 
alarm confirmation light, the display of such modes should be clearly distinguishable 
from the fire alarm mode. The alarm  confirmation light of dismountable detectors 
may be installed at the probe or on the base. When the alarm confirmation light is 
turned on, there should be a clear view 6m in front of it and with an illumination of no 
more than 5001x.  
4.1.2   Connection o f auxiliary equipments  
     When the detector is to be connected to other auxiliary equipments (e.g. remote 
confirmation light, control relay, etc.), the open circuit and short circuit connecting to 
the auxiliary equipment should not affect the normal func tioning of the detector.  
4.1.3   Pre -delivery setting  
     The pre -delivery setting of the detector should not be changed unless by special 
means (e.g. special tool or code) or by breaking the seal tape.  4.1.4   On -the-spot setting of response performance  
     If the response performance of the detector can undergo on -the-spot setting of 
the detector or its connected control and indication equipment, the following 
requirements should be met:  
     a) If the manufacturer declares that all of the settings mee t the requirements set 
out in this Standard, the detector, when operating on the ‘random’ setting, should meet 
the requirements set out in this Standard, and the on -the-spot device may only be 
realised by means of separation from the base through special t ools, codes or probe.  
b) If the manufacturer declares that a certain setting does not meet the 
requirements set out in this Standard, the setting should only be able to be realised by 
means of special tools or codes. There should be clear indication on the  detector or 
related documents stating that this setting does not meet the requirements set out in 
this Standard.  
4.1.5    Prevention from invasion of foreign matter  
     The detector should be able to prevent any spherical object at a diameter of (1.3 
± 0.05) mm from invading the detection room.  
4.1.6   User manual  
     The corresponding Chinese manual should be enclosed with the detector. The 
contents of the manual should meet the requirements set out in GB9969.1, and should 
be consistent with the performa nce of the product.  
4.1.7    Climatic environment tests  
4.1.7.1   Running tests  
     The detector should be able to perform the various tests under the climatic 
environment conditions specified in Table 1. During the test period and after the tests, 
the fol lowing requirements should be met:  
     a) during the test, the detector should not send out a fire alarm signal or 
malfunction signal;  
     b) after the test, the detector should be able to operate normally. When the 
response threshold value of point -type infrared flame detectors is compared with its 
response threshold value in the consistency test, the ratio of the maximum response 
threshold value to the minimum response threshold value should not be greater than 
1.3.  When the response threshold values o f the aspirated smoke detector and 
point -type carbon monoxide detector are compared with their response threshold 
values in the consistency test, the ratio of the maximum response threshold value to 
the minimum response threshold value should not be greate r than 1.6. The response 
threshold value of the image -type fire detector should meet the requirements set out in 
Subsection 4.4.1.  
  
Table 1   Requirements for climatic environment conditions of running test  
Name of Test  Test Parameters  Test Conditions  Functional mode  
Temperature, oC 55 ± 2  High temperature 
(running) test  Duration, h  2 Normal 
surveillance mode  
Temperature, oC -10 ± 3  Low temperature 
(running) test  Duration, h  2 Normal 
surveillance mode  
Tempera ture, oC 40 ± 2  
Relative humidity, %  93 ± 3  Steady -state damp 
heat (running) test  
Duration, h  4 Normal 
surveillance mode  
4.1.7.2   Durability tests  
     The detectors should be able to perform the various tests under the climatic 
environment conditions specified in Table 2, and should m eet the following 
requirements after the tests:  
a) when normal surveillance mode resumes after the tests, the detector should 
not send out a fire alarm signal or malfunction signal;  
b) after the tests, the detector should be able to operate normally. When the 
response threshold value of the point -type infrared flame detector is compared with its 
response threshold value in the consistency test, the ratio of the maximum response 
threshold value to the minimum response threshold value should not be greater th an 
1.3. When the response threshold values of the aspirated smoke detector and 
point -type carbon monoxide detector are compared with their response threshold 
values in the consistency test, the ratio of the maximum response threshold value to 
the minimum r esponse threshold value should not be greater than 1.6. The response 
threshold value of the image -type fire detector should meet the requirements set out in 
Subsection 4.4.1.  
Table 2   Requirements for climatic environment conditions for durability test  
Name of Test  Test Parameters  Test Conditions  Functional mode  
Temperature, oC 40 ± 2  
Relative humidity, %  93 ± 3  Steady state 
damp heat 
(durability) test  Duration, d  21 Power 
disconnection 
mode  
Temperature, oC 25 ± 2  
Relative humidity, %  93 ± 3  
Duration, d  21 Corrosion test  
SO 2 concentration 10-6 25 ± 5  Power 
disconnectio n 
mode  
4.1.8   Mechanical environment tests  
4.1.8.1   Running tests  
     The detectors should be able to perform the various tests under the mechanical environment condition s specified in Table 3. During the test period and after the tests, 
the detectors should meet the following requirements:  
a) during the test period, the detectors should not send out a fire alarm signal or 
malfunction signal;  
b) after the tests, there shou ld be no mechanical damage to the detectors or 
loosening at the tightening parts;  
c) after the tests, the basic operation of the detectors should be normal. When 
the response threshold value of the point -type infrared flame detector is compared 
with its re sponse threshold value in the consistency test, the ratio of the maximum 
response threshold value to the minimum response threshold value should not be 
greater than 1.3. When the response threshold values of the aspirated smoke detector 
and point -type carb on monoxide detector are compared with their response threshold 
values in the consistency test, the ratio of the maximum response threshold value to 
the minimum response threshold value should not be greater than 1.6. The response 
threshold value of the im age-type fire detector should meet the requirements set out in 
Subsection 4.4.1.  
Table 3   Requirements for mechanic environmental conditions for running test  
Name of 
Test Test Parameters  Test Conditions  Functional 
mode  
Frequency range, Hz  10 ~ 150 ~ 10  
Acceleration, m/s2 9.8 
Frequency sweep speed, 
octave per minute  1 
No of axes  3 Vibration 
test (sine)  
(running)  
No of frequency sweeps 
per axis  20 Normal 
surveillance 
mode  
(100-20m) × 10 (mass m  
4.75 kg  inch)  Peak value acceleration, 
m/s2 0 (mass m > 4.75 kg inch)  
Pulse time, ms  6 Impact 
test 
Impact direction  6 Normal 
surveillance 
mode  
Hammer head speed, m/s  1.5 ± 0.125  
Kinetic energy of impact, J  1.9 ± 0.1  Collision 
test 
No of impacts  1 Normal 
surveillance 
mode  
4.1.8.2   Durab ility tests  
     The detectors should be able to perform the various tests under the mechanical 
environment conditions specified in Table 4. After the tests, the detectors should meet 
the following requirements:  a) when normal surveillance mode is resumed,  the detectors should not send out 
a fire alarm signal or malfunction signal;  
b) after the tests, the basic operation of the detectors should be normal. When 
the response threshold value of the point -type infrared flame detector is compared 
with its respon se threshold value in the consistency test, the ratio of the maximum 
response threshold value to the minimum response threshold value should not be 
greater than 1.3. When the response threshold values of the aspirated smoke detector 
and point -type carbon m onoxide detector are compared with their response threshold 
values in the consistence test, the ratio of the maximum response threshold value to 
the minimum response threshold value should not be greater than 1.6. The response 
threshold value of the image -type fire detector should meet the requirements of 
Subsection 4.4.1.  
Table 4   Requirements for mechanic environmental conditions of durability 
test 
Name of Test  Test Parameters  Test Conditions  Functional 
mode  
Frequency range, Hz  10 ~ 150 ~ 10  
Acceleration, m/s2 10 
Frequency sweep speed, 
octave per minute  1 
No of axes  3 Vibration test 
(sine)  
(durability)  
No of frequency sweeps per 
axis 20 Power 
disconnection 
mode  
4.1.9   Electromagnetic compatibility test  
     The detectors should be able to p erform the electromagnetic compatibility tests 
specified in Table 5. During the test period and after the tests, the detectors should 
meet the following requirements:  
a) during the test, the detectors should not send out a fire alarm signal or 
malfunction signal;  
     b) after the tests, the basic operation of the detectors should be normal. When 
the response threshold value of the point -type infrared flame detector is compared 
with its response threshold value in the consistency test, the ratio of the max imum 
response threshold value to the minimum response threshold value should not be 
greater than 1.3. When the response threshold values of the aspirated smoke detector 
and point -type carbon monoxide detector are compared with their response threshold 
values in the consistency test, the ratio of the maximum response threshold value to 
the minimum response threshold value should not be greater than 1.6. The response 
threshold value of the image -type fire detector should meet the requirements set out in Subse ction 4.4.1.  
Table 5   Requirements of electromagnetic compatibility test conditions  
Name of Test  Test Parameters  Test Conditions  Functional 
mode  
Field strength, V/m  10 
Frequency range, MHz  80 ~ 1000  
Modulation amplitude  80% (Hz, sine)  Immunity test 
of 
radio-frequency  
electromagnetic 
radiation  Frequency sweep speed, 
decuple octave per second   1.5 × 10-3 Normal 
surveillance 
mode  
Voltage, dBV  140 
Frequency range, MHz  0.15 ~ 100  
Modulation amplitude  80% (Hz, sine)  Immunity test 
of conductive 
interference of 
radio-frequency  
field sensor  Frequency sweep speed, 
decuple octave per second   1.5 × 10-3 Normal 
surveillance 
mode  
Air discharge (sample 
with insulated shell) 
8 
Discharge voltage, kV  Contact discharge 
(sample with 
conductive shell and 
coupling plate) 6  
No of discharges per point  10 
Disch arge electrode  Positive, negative  Immunity test 
of static 
discharge  
Time interval, s   1 Normal 
surveillance 
mode  
Voltage peak, kV  1 × (1 ± 0.1)  
Repetition frequency, kHz  5 × (1 ± 0.2)  
Electrode  Positive, negative  Immunity test 
of electric 
speedy 
transient pulses  Time  1 min. each time  Normal 
surveillance 
mode  
Voltage of surging impact, 
kV Wire -ground  
1 × (1 ± 0.1)  
Electrode  Positive, negative  Immunity test 
of surging 
(impact)  
No of tests taken  5 Normal 
surveillance 
mode  
4.2   Point -type infrared flame detectors  
4.2.1   Consistency of distrib ution of response threshold values  
     Measure the response threshold value of each detector under normal 
environmental conditions. The ratio of its maximum response threshold value to the 
minimum response threshold value should not be greater than 2.0.  
4.2.2   Repetitiveness       Measure the response threshold value of the same detector in a random bearing 
6 times continuously under normal environmental conditions. The ratio of its 
maximum response threshold value to the minimum response threshold value s hould 
not be greater than 1.3.  
4.2.3   Bearing  
     The angles included between the axes and optical axes of detectors are set to 0o, 
0o, 15o, 30o and 45o. Each of the response threshold values is measured once. The 
cone angle of detector should not be sma ller than 45o. The ratio of its maximum 
response threshold value to the minimum response threshold value should not be 
greater than 2.0.  
4.2.4   Power connection  
     The detectors should be able to run under normal surveillance mode for 7 
consecutive days . During the test period, the samples should not send out a fire alarm 
signal or malfunction signal. After the tests, the response threshold value should be 
compared with the response threshold value of this detector in the consistency test, 
and the ratio of the maximum response threshold value to the minimum response 
threshold value should not be greater than 1.3.  
4.2.5   Power -source parameter fluctuation  
     The voltage of the power supply to the detectors is -15% and +10% of the rated 
working voltage. Measure the response threshold value, which is compared with the 
response threshold value in the consistency test; the ratio of the maximum response 
threshold value to the minimum response threshold value should not be greater than 
1.6. 
4.2.6   Interferenc e of environmental beam  
     During the following environmental beam functioning periods, the detectors 
should not send out a fire alarm signal or malfunction signal. After the environmental 
beam interference is over, the response threshold value of detect or should measured 
under the condition that the incandescent lamp and fluorescent lamp are 
simultaneously turned on. When the response threshold value is compared with the 
response threshold value of this detector in the consistency test, the ratio of the 
maximum response threshold value to the minimum response threshold value should 
not be greater than 1.6. After the test, the ratio of the response threshold values of 
sample, Smax : Smin should not be greater than 1.3.  
a) allow two 25W incandescent lamps ( colour temperature at 2850K ± 100K) to 
be turned on for 1 second and turned off for 1 second, repeating 20 times.  
b) allow a 30W ring -shaped fluorescent lamp at a diameter 308mm to be turned 
on for 1 second and turned off for 1 second, repeating 20 times.  
c) allow the abovementioned incandescent lamps and fluorescent lamp to be turned on for 2 hours.  
4.2.7   Fire sensitivity  
     Under the fire test conditions specified in Table 6, the detectors should send out 
a fire alarm signal within 30 seconds. When se nding out a fire alarm signal, a distance 
of 25m between the sample and the centre of the test fire is regarded as Grade I 
sensitivity; a distance of 17m is regarded as Grade II sensitivity; and a distance of 
12m is regarded as Grade III sensitivity.  
Table  6   Requirements for the conditions of fire sensitivity test  
Name of 
Test Fire  Test Fire Conditions  
Fuel Heptane (analytical pure/AP grade) plus toluene at 
volume fraction 3%  
Mass  650g  
Layout  Place the fuel in a container made of steel plates of 2mm 
thickness, base dimensions 33cm×33cm, and height 5cm  Normal 
heptane 
fire 
Ignition way  Flame or electric spark  
Fuel Industrial ethanol (above 90% of ethanol content, with 
small amount of methanol)  
Mass  2000g  
Layout  Place the fuel in  a container made of steel plates of 2mm 
thickness, base dimensions 33cm×33cm, and height 5cm  Ethanol 
open fire  
Ignition way  Flame or electric spark  
4.3   Aspirated smoke detectors  
4.3.1   Performance of the main parts of pipe sampling -type aspirated smoke 
detectors  
4.3.1.1   Indicating lights  
4.3.1.1.1   There should be a yellow light on the detector to indicate malfunctions.  
When the detector sends out a malfunction signal, the indicating light should be lit 
and should remain lit until the malfunction has been resolved . When the indicating 
light is lit, objects within 3m should be clearly visible under the condition that the 
illumination of the surrounding environment is 5Lx ~500Lx  
4.3.1.1.2   There should be a green power indicating light on the detector. When the 
detector is connected to a power supply, the indicating light should be lit and remain 
lit. When the indicating light is ignited, and under the condition that the illumination 
of the surrounding environment is 5Lx ~500Lx, the things at the place of 3m from its  
front should be clearly visible.  
4.3.1.1.3   The functions of the indicating lights should be indicated. If this is in the 
form of a written indication, the text should be in Chinese.  4.3.1.2   Letter/symbol –number displayer  
     Should a letter/symbol –number displayer be attached to the detector, when the 
displayer is in display mode, and under the condition that the illumination of the 
environment is 5Lx ~500Lx, it should be readable from within 0.8m from the front of 
the detector.  
4.3.1.3   Fuse  
     T he rated current value of the fuse for power circuit or other overcurrent 
protection devices should generally not be greater than 2 times of the maximum 
working current of detector. When the maximum working current is greater than 6A, 
its 1.5 times can be taken as the current value of the fuse. The parameter values 
should be clearly indicated close to the fuse or other over -current protection devices.  
4.3.1.4   Wiring terminal  
     The number or symbols of each wiring terminal should be clearly and firmly 
indicated. Its corresponding purposes should be indicated in the related documents.  
4.3.1.5   Switch and buttons  
     The functions of the switches and buttons of the detector should be clearly 
indicated in a position above or close to them in Chinese text as a minimum.  
4.3.1.6   Aspiration pipe  
     The aspiration pipe should be firm and durable, painted in red or painted with a 
red mark at a width not smaller than 2mm along the pipe. Within 1m from the two 
ends, the following words should be indicated - aspiration pipe of detector, with the 
height of each word no greater than 5mm. The diameter of the aspiration pipe should 
not be smaller than 2mm.  
4.3.1.7   Sounding device  
     Detecting and alarm mode aspirated smoke detectors should be equipped with a 
sounding device to indicate fire alarm and malfunctions. Under normal working 
conditions, the sound pressure (weighted A) of the sounding device 1m from the front 
of the detector should be greater than 65dB and smaller than 115dB. It should be able 
to functio n under 85% of rated working voltage condition.  
4.3.2   Basic performances  
4.3.2.1   Malfunction warning  
     If a leakage or blockage of the detector aspiration pipe makes the aspiration 
flow of the detector greater than 150% of normal aspiration flow or less than 50% of 
normal aspiration flow, a malfunction signal should be sent out within 100 seconds.  
4.3.2.2   Fire alarm function  
     When the smoke parameter of fire acquired by the detector from any single 
sampling hole meets the alarm conditions, it s hould send out a fire alarm signal within 
120 seconds.  4.3.2.3   Special functions of detecting and alarm mode detectors  
4.3.2.3.1  Fire alarm function  
     The detector should be able to send out a fire alarm sound and light signal to 
indicate the place in  which the fire occurs, record the time at which the fire alarm 
sounds (the error of the clock of detector should not exceed 30 seconds per day), and 
retain it until it is turned off. The alarm sound signal should be able to be turned off 
manually. With re gard to detectors with multiple fire alarms: when another fire occurs, 
the detector should be able to send out a fire alarm sound and light signal once again. 
The fire alarm signal shall have a higher priority than the malfunction alarm signal.  
4.3.2.3.2   Malfunction alarm  
     If the detector and its connected parts malfunction, the detector should be able 
to send out malfunction sound and light signal, which are clearly different to those of 
fire alarm signal. The malfunction light signal should stay on until the malfunction 
problem is resolved. The sounding signal of the detector should be able to be turned 
off manually. If a new malfunction signal or sound signal occurs, it should be able to 
be restarted. The detector should indicate when the following kinds of malfunction 
occur:  
     a) disconnection of the main power source or insufficiency of voltage;  
     b) the disconnection or short circuit of the connection wire between the charger 
charging the reserve power and the reserve power;  
     c) disconne ction or short circuit of the connection wire between the reserve 
power and its load, or insufficient voltage for the protection of the normal working of 
detector when power is independently supplied by reserve power.  
4.3.2.3.3   Power source function  
     a) alternating current (AC) power  
     When the detector is supplied by AC power supply, it should be able to operate 
normally under the condition that the rated working voltage is between 110% and 
85% and has the function of main/reserve power switch. W hen the main power is 
disconnected, the detector should be able to switch to the reserve power automatically. 
When the main power is resumed, it should be able to switch to the main power 
automatically. The working mode of the main and reserve power supply  should be 
indicated. The main power source should have overcurrent protection measures. The 
main reserve power switch should not make the detector send out a fire alarm signal.  
     b) reserve power  
     Under the condition that the reserve power is disch arged to the end voltage and 
then charged for 24 hours, its capacity should be able to guarantee that the detector 
can work for 30 minutes under alarm mode after it has been working under normal 
surveillance mode for 8 hours.  4.3.2.3.4   Self -inspection fu nction  
     The detector should be able to manually inspect all indicating lights and 
displays on its panel. During self -inspection, not all the output joints under control of 
the detector should function. When the self -inspection time of the detector exce eds 1 
minute, or when it cannot automatically stop the self -inspection function, the 
self-inspection function of the detector should not affect the fire alarm function of the 
parts that do not undergo self -inspection and the detector itself.  
4.3.2.3.5   Re storation  
     The restoration of the detector can only be realised by means of special tool, 
code, etc.  
4.3.2.3.6   On/off power  
     The power for turning the detector on and off can only be realised by means of 
special tool, code, etc.  
4.3.3   Response threshold values  
4.3.3.1 The response threshold values of the detector should meet the requirements set 
out in Table 7.  
Table 7   Requirements of response threshold values  
Type of detector  Response threshold value m (indicated by dim rate)  
High sensitivit y m  0.8 %  obs/m  
Sensitivity  0.8%obs/m  < m  2 % obs/m  
General  m > 2% obs/m  
     When the response threshold value of the detector is adjustable at or above two 
ranges in Table 1, the range of response threshold values should be indicated, and 
should meet the corresponding requirements.  
4.3.3.2    The response threshold value of the detector should be measured according 
to the following methods:  
4.3.3.2.1   Normal surveillance mode of test  
     If test method stipulates that the detector must work under norm al surveillance 
mode, the sample should be connected to the control and indicating equipment 
provided by the manufacturer. When there are no special stipulations in the related 
subsections, the working voltage of the detector should be guaranteed at the ra ted 
working voltage, and the working voltage during the test period should be kept stable.  
      Note:   The detection report of the detector should indicated the model numbers and 
manufacturers of the control and indicating equipment adapted to the detect or 
during the test period.  
4.3.3.2.2    Installation of detector  
     The pipe -sampling -type detectors should be installed according to normal 
installation methods with the maximum length of pipe as specified by the manufacturer. If methods for multiple ins tallations are provided in the manual, the 
installation method that would be most unfavourable to the operation of the detector 
should be used in the test, and the measurement of the response threshold value 
should be conducted at the most unfavourable sam pling hole. The 
point -sampling -type detector should be installed according to the normal installation 
method specified by the manufacturer. If multiple installation methods are provided in 
the manual, the installation method that would be most unfavourable  to the operation 
of the detector should be used in the test.  
4.3.3.3   As to the detectors with adjustable response threshold values, measurement 
should be respectively made according to the gradation of response threshold values 
specified by the manufact urer. 
4.3.4   Repetitiveness  
     Measure the response threshold value of the sample at a random sampling hole 
in a normal working position 6 times continuously. The ratio of the maximum 
response threshold value to the minimum response threshold value sho uld not be 
greater than 1.6.  
4.3.5   Consistency of distribution of response threshold values  
     Measure the response threshold value of each detector under normal 
environmental conditions. The ratio of the maximum response threshold value to the 
average  response threshold value should not be greater than 1.33. The ratio of the 
average response threshold value to the minimum response threshold value should not 
be greater than 1.5.  
4.3.6   Power -source parameter fluctuation  
     The voltage of the power su pply to detectors is -15% and +10% of the rated 
working voltage. Measure the response threshold value, which is compared with the 
response threshold value in the consistency test; the ratio of the maximum response 
threshold value to the minimum response th reshold value should not be greater than 
1.6. 
4.3.7   Insulation performance  
     The insulation resistance value between the frame and the externally charged 
terminal of the detector with insulation requirement should not be less than 20M .  
The insulation resistance value between the frame and the power input end should not 
be less than 50M . 
4.3.8   Current leakage  
     When the detector is working at 1.06 times of the rated voltage, the current 
leakage should not exceed 0.5mA.  
4.3.9   P ower transient  
     Allow the main power of the detector to be disconnected continuously 500 times according to the fixed procedures of “power connection (9 seconds) - power 
disconnection (1 second).” During the test, the detector should remain in normal 
surveillance mode. After the test, the basic operation of the detector should be normal.  
When the response threshold value of this detector is compared with its response 
threshold value of in the consistency test, the ratio of the maximum response 
thresho ld value to the minimum response threshold value should not be greater than 
1.6. 
4.3.10   Voltage fall  
     Allow the main voltage of detector to fall by 60% for 20 minutes and repeat 10 
times, after which allow the main voltage to fall by 100% for 10 minu tes, repeating 10 
times. During the test, the detector should remain in normal surveillance mode.  
After the test, the basic operation of the detector should be normal. When the response 
threshold value of this detector is compared with its response thresh old value of in the 
consistency test, the ratio of the maximum response threshold value to the minimum 
response threshold value should not be greater than 1.6.  
4.3.11   Fire sensitivity  
     Install two samples on the ceiling surface of the burning test ro om by the most 
unfavourable way according to the requirements of GB 4715.  Install the remaining 
detection pipes at the outer side of the burning test room.  The samples are situated 
at normal surveillance mode according to the requirements.  Install and a djust the 
samples according to the manual of the manufacturer.  As to the samples with 
adjustable response threshold values, their response threshold values should be preset 
at the maximum limit values.  
     Before each kind of test fire ends, the detector  should send out fire alarm signal.  
4.4   Image -type fire detector  
4.4.1   Response threshold value  
4.4.1.1   When the sample is under Grade 1 and Grade 2 fire -prevention detection 
modes, the smallest discovered flame dimensions and positioning accuracy sh ould 
meet the requirements set out Table 8.   
4.4.1.2   The response time from the time at which the fire occurs to the time the fire 
alarm signal is sent out should not be more than 20 seconds.  
Table 8   Table of Grade 1 and Grade 2 fire -prevention detect ion parameters  
Angle of field of 
view  Dimensions of burning disc  
(m × m)  Positioning accuracy  
Distance 
D (m)  Lens  
(mm)  Horizontal 
 Vertical 
 Grade 1 five 
prevention  Grade 2 five 
prevention  r X r Y 
4 64o 50o 0.020 × 0.020  0.060 × 0.060  ± 0.100  ± 0.147  5 
6 42 o 32o 0.020 × 0.020  0.040 × 0.040  ± 0.100  ± 0.142  8 32o 24o 0.020 × 0.020  0.030 × 0.030  ± 0.100  ± 0.142  
12 22o 17o 0.020 × 0.020  0.020 × 0.020  ± 0.100  ± 0.806  
4 64o 50o 0.090 × 0.090  0.400 × 0.400  ± 0.488  ± 0.754  
6 52o 32o 0.060 × 0.060  0.250 × 0.250  ± 0.300  ± 0.727  
8 32o 24o 0.040 × 0.040  0.150 × 0.150  ± 0.225  ± 0.723  25 
12 22o 17o 0.030 × 0.030  0.090 × 0.090  ± 0.1 53 ± 0.931  
6 42o 32o 0.150 × 0.150  0.550 × 0.550  ± 0.600  ± 0.643  
8 32o 24o 0.090 × 0.090  0.400 × 0.490  ± 0.450  ± 0.494  50 
12 22o 17o 0.060 × 0.060  0.260 × 0.250  ± 0.306  ± 0.360  
100 12 22o 17o 0.150 × 0.150  0.600 × 0.600  ± 0.612  ± 0.612  
4.4.2   Repet itiveness  
     Measure the response threshold value of a detector 3 times in a row. After being 
connected to a power supply for 7 days, the response threshold value of the detector 
should be re -measured 3 times in a row. Whilst connected to the power supp ly, the 
detector should not send out a fire alarm signal or malfunction signal. Its response 
threshold values should meet the requirements set out in Subsection 4.4.1.  
4.4.4   Interference of environmental beam  
     During the following environmental beam functioning periods, the detectors 
should not send out a fire alarm signal or malfunction signal. After the test, the 
response threshold value of the detector should meet the requirements set out in 
Subsection 4.4.1.  
a) Allow two 25W incandescent lamps (c olour temperature at 2850K ± 100K) 
to be turned on for 1 second and turned off for 1 second, and repeat 20 times.  
b) Allow a 30W ring -shaped fluorescent lamp at a diameter of 308mm to be 
turned on for 1 second and turned off for 1 second, and repeat 20 tim es. 
c) Allow the abovementioned incandescent lamps and fluorescent lamp to be 
turned on for 2 hours.  
4.5   Point -type carbon monoxide fire detector  
4.5.1   Measurement of fixed response threshold value  
4.5.1.1   The response threshold value of the detector  should be selected from the 
range specified in Table 9.  
4.5.1.2   The measurement of the response threshold value of the detector should be 
carried out using a gas inspection device, which should meet the requirements set out 
in Annex A, as well as the te st requirements for position, voltage fluctuation, airflow, 
high temperature, etc. The gas sensor installed at the inspection device should meet 
the requirements set out in Annex B.  
4.5.1.3    The detector should be installed in the gas inspection device. I f no special 
requirements are set out in the related subsections, the most unfavourable position should be adopted. The airflow around the detector should be (0.2 ± 0.04)m/s , and the 
airflow temperature should be (23 ± 5)oC. 
4.5.1.4    The concentration of gas is expressed as the volume fraction in percentage 
(hereinafter referred to as “ul/l”).  
4.5.1.5    Before the test, the concentration of carbon monoxide inside the air test 
device and detector should be lower than 5ul/l. If no special requirements are se t out 
in the related subsections, the detector should be able to operate stably under normal 
surveillance mode for 15 minutes.  
4.5.1.6  According to the speed of 5ul/l/min., the concentration of carbon monoxide 
inside the gas inspection device is increased  to 15ul/l, and maintained as such for 10 
minutes. The detector should not send out a fire alarm or malfunction signal.  
4.5.1.7  At the continuous speed of 5ul/l/min., carbon monoxide is added into the gas 
inspection device until the detector sends out a fi re alarm signal or until the 
concentration of carbon monoxide reaches 100ul/l. Record the concentration value of 
carbon monoxide at the time at which the detector sends out an alarm signal. Such a 
concentration value is just the response threshold value (S ) of detector.  
4.5.1.8  The response threshold value (S) of the detector should meet the requirements 
set out in Table 9. Through the detector or its connected control and indicating 
equipment, it should be able to check the preset response threshold value (S0) of 
detector.  
Table 9   Fixed response threshold values  
Response threshold 
value  Preset response 
threshold value 
(S0) Minimum response 
threshold value  Maximum 
response threshold 
value  
ul/l 26 ~ 45  0.7 S 0 1.5 S 0 
4.5.2   Measurement of adjustable respo nse threshold value  
4.5.2.1    The response threshold value of the detector should be continuously 
adjustable within the S 0 range specified in Table 10.  
4.5.2.2    The detector should be adjusted to be the preset maximum and minimum 
response threshold values . Perform the test of response threshold value according to 
Subsections 4.5.1.1 - 4.5.1.7.  
4.5.2.3    The response threshold value (S) of detector should meet the requirements 
of Table 10. Through the detector or its connected control and indicating equipme nt, it 
should be able to check the preset response threshold value of detector.  
4.5.2.4    In addition to the specified special test requirements, the response threshold 
value testing of the detector can be performed at any single specified preset value.  
 Table 10   Adjustable response threshold values  
Response threshold 
value  Preset response 
threshold value 
(S0) Minimum response 
threshold value  Maximum 
response threshold 
value  
ul/l 23 ~ 66  0.7 S 0 1.5 S 0 
4.5.3   Basic performances of independent -type detec tor 
4.5.3.1   When a fire occurs in the area under surveillance and reaches the alarm, the 
detector should send out sound and light fire alarm signals.  
4.5.3.2    At a distance of 3m from the detector, the sound pressure of the fire alarm 
signal should be g reater than 60dB (weighted A).  
4.5.3.3   The detector should possess a self -inspection function. During 
self-inspection, the detector should send out sound and light fire alarm signals.  
4.5.3.4    For detectors with multiple indicating lights, the indicatin g lights should be 
identified and marked by different colours. The fire indicating light should be red, and 
the malfunction indicating light should be yellow. Detectors which use AC power 
should have a light indicating the AC power connection. The AC power  indicating 
light is green.  
4.5.3.5    The power of the detector should meet the following requirements:  
4.5.3.6   For detectors powered by an internal battery and detectors powered by 
external battery, the capacity of the battery should be such that it gua rantees the 
normal operation of the detector for not less than 5 months. Before the battery fails to 
make the detector operate in alarm mode, it should send out a malfunction signal, 
which should sound clearly different to the fire alarm signal. The malfun ction signal 
should continuously sound at least once every minute over at least 7 consecutive days.  
Before this stage, the detector should be able to send out sound and light fire alarm 
signals. The fire alarm signal should last for at least 4 minutes.  
4.5.3.7   For detectors operating through an external power supply that are equipped 
with an internal reserve battery, when the external power cannot operate normally, the 
detector should automatically switch to the reserve battery power supply. The reserve 
battery should guarantee the detector’s operation in surveillance mode for at least 72 
hours. Before the battery fails to make the detector operate in alarm mode, it should 
send out a sounding malfunction signal that is clearly different to the fire alarm signal.  
4.5.3.8 The reverse polarity of the power of detector should not damage the detector.  
4.5.4   Interference of gas  
     Allow the detector to be exposed to gases with the concentrations specified in 
Table 11 for 1 hour. During the test period, the detector should not send out a fire 
alarm signal or malfunction signal.  
 Table 11   Interference Gas Concentrations  
Type of Gas  Concentration Value (ul/l)  
Methane  500 
Butane  300 
Heptane  500 
Ethyl acetate  200 
Isopropanol  200 
Carbon dioxide  1000  
4.5.5    Repetitiveness  
     Measure the response threshold value of the same detector in a random bearing 
and in a normal working position 6 times continuously. The ratio of its maximum 
response threshold value to the minimum response threshold value should not  be 
greater than 1.6. The minimum response threshold value should not be smaller than 
0.8 time of the preset response threshold value.  
4.5.6   Bearing  
     Allow the detector rotate 45o in the same direction around the vertical wire, 
repeating 8 times. Mea sure the response threshold value once each time. The ratio of 
the maximum response threshold value to the minimum response threshold value 
should not be greater than 1.6. The minimum response threshold value should not be 
less than 0.8 time of the preset response threshold value. In the subsequent tests, the 
corresponding bearings of the maximum response threshold value and the minimum 
response threshold value are called “the most unfavourable” and “the most 
favourable” bearings respectively.  
4.5.7   Consi stency of the distribution of response threshold values  
     Measure the response threshold value of each detector. The ratio of its 
maximum response threshold value to the average response threshold value should 
not be greater than 1.33. The ratio of the average response threshold value to the 
minimum response threshold value should not be greater than 1.5. The minimum 
response threshold value should not be less than 0.7 times the preset response 
threshold value. The maximum response threshold value should  not be greater than 
1.5 times the preset response threshold value.  
4.5.8   Long -term stability  
     Put the detector into normal surveillance mode, and maintain in the said mode 
for 3 months. The detector should not send out a malfunction signal. After th e test, 
when the response threshold value of the detector is compared with the response 
threshold value in the consistency test, the ratio of the maximum response threshold 
value to the minimum response threshold value should not be greater than 1.6.  
4.5.9    High concentration flooding       After the detector has been kept in carbon monoxide for 3 hours with its 
concentration increased to 500ul/l at a speed of 5ul/l/min., it should be kept under 
normal atmospheric conditions for 4 hours. After the test, com pare the response 
threshold value of the detector with its response threshold value in the consistency test; 
the ratio of the maximum response threshold value to the minimum response 
threshold value should not be greater than 1.6.  
4.5.10   Carbon monoxide response sensitivity  
     Keep the detector keep in an environment with carbon monoxide at the 
concentration 70ul/l and other interference gases with the concentrations specified in 
Table 12 for 1 hour. During the test, the sample should continuously send out a fire 
alarm signal.  
Table 12   Concentration of gas  
Type of Gas  Concentration of gas ul/l  
Hydrogen  20 
Nitrogen oxide  10 
4.5.11   Power source parameter fluctuation  
     The voltage of the power supply to detectors is -15% and +10% of the rated 
work ing voltage. Measure the response threshold value and compare with the 
response threshold value in the consistency test; the ratio of the maximum response 
threshold value to the minimum response threshold value should not be greater than 
1.6. The minimum r esponse threshold value should not be less than 0.8 times the 
preset response threshold value.  
4.5.12   Airflow  
     When the detector is under the surrounding airflow velocities (0.2 ± 0.04) m/s 
and (1.0 ± 0.2) m/s, the response threshold values in “the m ost unfavourable” and “the 
most favourable” bearings are respectively measured, and are expressed as S (0.2) max 
(1), S (0.2) min, S (1.0) max (2), and S (1.0) min respectively.  
Note 1:  The subscript 0.2 refers that the airflow velocity is (0.2 ± 0.04) m/ s. 
      Note 2:  The subscript 1.0 refers that the airflow velocity is (1.0 ± 0.2) m/s.  
     The response threshold value of detector should satisfy:  0.625  (S (0.2) max + S 
(0.2) min) / (S (1.0) max + S (1.0) min)  1.6.  
 
5   Test methods  
 
5.1   General rules  
5.1.1   Atmospheric conditions of test  
    In addition to the conditions specified in the related subsections, each item 
should be tested under the fo llowing atmospheric conditions:       –– Temperature:  15oC ~ 35oC; 
     –– Humidity:  25%RH ~ 75%RH;  
     –– Atmospheric pressure:  86kPa ~ 106kPa.  
5.1.2   Normal surveillance mode of test  
     If the test methods stipulate that the detector (hereinafter referred to as 
“sample”) should be connected to the control and indicating equipment provided by 
the manufacturer when in normal surveillance mode, then when there are no special 
requirements specified in the related subsections, the working voltage of the  detector 
should be guaranteed to be the rated working voltage, and the working voltage should 
remain stable during the test period.  
      Note: The detector test report should specify the details of the control and indicating equipment 
connected during th e test period, including their model numbers and manufacturers.  
5.1.3   Tolerance  
     In addition to the conditions specified in the related subsections, the tolerance 
of each test data is ± 5%, and the deviation for the parameters of environmental 
condit ions should meet the requirements set out in GB16838.  
5.1.4   Pre -test inspection  
5.1.4.1   Before testing, an appearance inspection should be carried out on the 
sample, which should meet the following requirements:  
     a) there should be no corrosion, di splaced coating and bubbling on the surface 
of the sample, and no mechanical damage, such as scratches, cracks, etc.  
     b) there should be no loosening at the tightening parts.  
5.1.4.2    Before testing, an inspection should be carried out on the sample a ccording 
to the requirements specified in Subsections 4.1.1 - 4.1.6. Testing may not be carried 
out cannot until the sample meets the requirements.  
5.1.5   Test samples (hereinafter referred to as “samples”)  
5.1.5.1    Point -type infrared flame detectors  
     10 detectors, which are given numbers before being tested.  
5.1.5.2   Aspirated smoke detectors  
     4 detectors, (composed of all the parts of the detector, including the control and 
indicating equipment required for it to be connected), which are given  numbers before 
being tested.  
5.1.5.3   Image -type fire detectors  
     4 sets of detectors, which are given numbers before being tested.  
5.1.5.4    Point -type carbon monoxide detectors  
     16 sets of detectors, which are given numbers before being tested.  
5.1.6    Installation of detectors  
     The detectors should be installed according to the normal installation methods specified by the manufacturer. If multiple methods for installation are provided in the 
manual, the installation method that is most unfav ourable to the operation of the 
detectors should be adopted in the tests.  
5.1.7   Test procedures  
     Tests should be performed according to the procedures specified in Table 13.  
Table 13   Test procedures  
Serial 
No Subsection  Test item  Point -type 
infrare d 
flame 
detector  Aspirated 
smoke 
detector  Image - 
type fire 
detector  Point -type 
carbon 
monoxide 
detector  
1 5.2~5.5  Basic performance tests of 
detector  1~10  1~4 1~4 1~16  
2 5.6 High temperature (running) 
test 2 3a 1 4 
3 5.7 Low temperature (running) 
test 3 4 2 5 
4 5.8 Steady -state damp heat 
(running) test      
5 5.9 Steady -state damp heat 
(durability) test      
6 5.10 Corrosion test      
7 5.11 Vibration (sine) (running) 
test     
8 5.12 Impact test      
9 5.13 Collision test      
10 5.14 Vibration (sine) (running) 
test     
11 5.15 Immunity test of 
radio-frequency  
electromagnetic radiation      
12 5.16 Immunity test of 
conductive interference of 
radio-frequency  field sensor      
13 5.17 Immunity test of static 
discharge      
14 5.18 Immunity test of electr ic 
speedy transient pulses      
15 5.19 Immunity test of surging     (impact)  
16 5.20 Fire sensitivity test      
Note a:  applies to point -type sampling method.  
5.2   Basic performance tests of point -type infrared flame detector  
5.2.1   Measurement of re sponse threshold values  
5.2.1.1   Purpose  
     To measure the response threshold values of detectors.  
5.2.1.2   Equipment  
     The test device of an infrared flame detector is equipment for special use. It is 
composed of an optical orbit, infrared light so urce, light dimmer, shutter, modulator, 
sample stand and other related parts (as shown in Figure 1). This equipment should 
satisfy the test requirements set out in Subsections 5.2.1 -5.2.7.  
 
 
 
 
 
 
1 – flame; 2 – methane gas burning furnace, 3 – modulator;  4 – light dimmer; 5 – shutter; 6 – sample; 
7 – sample stand; 8 – receiving surface; 9 – infrared filter; 10 – sensor; 11 – adjustable mechanism; 
12 – optical orbit; 13 – radiation meter  
Figure 1   Structural diagram of test device of infrared flame sample  
5.2.1.2.1   Optical orbit  
     Main technical parameter  
     Length: 2m  
     Flatness: less than 0.04mm  
5.2.1.2.2   Infrared light source  
     The infrared light source adopts the flame produced from burning methane with 
purity not lower than 99.9%. Durin g the test process, the volume change of the light 
source radiation energy should not be greater than ± 5%.  
5.2.1.2.3   Light dimmer  
     The light dimmer has the function of weakening the infrared radiation. The 
neutral light dimmer adopted in this test d evice can go through the infrared radiation 
with a wavelength greater than 850mm and smaller than 1050mm. Its transmittance 
depends on the concrete test requirements.  
5.2.1.2.4   Modulator (selective)  
     The modulator is composed of a chopper and direct current (DC) electric motor.  
The DC electric motor drives the chopper to rotate by the required frequency, and Image of Figure 1  modulates the radiation produced by flame burning (as shown in Figure 2).  
 
Unit: mm  
                                    Chopper  
 
                                                                 Motor  
 
 
 
Figure 2   Structural diagram of modulator  
5.2.1.2.5 Installation stand  
     The installation stand can be installed with samples of different model numbers, 
and can slide along the optical orb it. The height of the stand is adjustable. It can also 
rotate by taking the perpendicular of the axle centre of optical orbit as the axle centre. 
The stand itself should perform blackening treatment. There should be no reflection 
on the surface.  
5.2.1.3   Methods  
5.2.1.3.1   Installation of sample  
     Install the sample on the test device stand, so that it is situated on the same 
horizontal line as the light source, enabling it to receive the greatest amount of 
infrared light radiation and connect with the  control or indicating equipment. It should 
be in normal surveillance mode and should be maintained stable.  
     Use a radiation meter to measure the radiation energy of the light source at 
1500mm distance from the light source.  
5.2.1.3.2   Measurement of D value of the sample at the response point  
     Repeatedly move the installation stand of the sample along the optical obit.  
Ensure that the sample is at a position with a reliable response within 30 seconds and 
at the greatest distance from the light so urce. Measure the distance between the point 
and the light source, which is simply the D value of the sample at the response point.  
     According to the optical principles, the square of the distance K between the 
response point and light source of the s ample are inversely proportional to the 
effective power S of light source on the radiation of the sensing surface of sample, 
implying that:  
S = K / D2 (K is the transformation constant)  
     For samples with random response properties, its response thresho ld value 
should first be measured repeatedly at least 6 times until the change of the response 
threshold value of the next measurement does not exceed the average of the response 
threshold values measured in the previous several times by 10%.      For dete ctors that require a flicker frequency, the modulator should be adjusted 
to the flicker frequency provided by the manufacturer (including 0).  
5.2.1.3.3   Calculation of response threshold ratio  
     Compare the response threshold values measured 2 times, t he greater one being 
Smax and the smaller one being S min, corresponding to D max and D min respectively.  
The response threshold ratio is S max : S min = D2
max : D2
min: . 
5.2.2   Consistence test  
5.2.2.1   Purpose  
     To test the distribution consistency of r esponse threshold values of the detector.  
5.2.2.2   Methods  
     Measure the D values of 10 samples at the response points according to the 
methods specified in Subsection 5.2.1.3. Among these values, the maximum value is 
Dmax, the minimum value is D min, and the calculated response threshold ratio is S max : 
Smin. 
5.2.2.3   Requirements  
     The detector should meet the requirements set out in Subsection 4.2.1.  
5.2.2.4   Equipment  
     Test device of infrared flame sample.  
5.2.3   Repetitiveness test  
5.2.3.1    Purpose  
     To test the stability of the detector during continuous operation.  
5.2.3.2   Methods  
     According to the methods specified in Subsection 5.2.5.3, the D value of 
sample at the response point in a random bearing is measured 6 times continuo usly 
under normal operation. Among these values, the maximum value is D max, the 
minimum value is D min, and the calculated response threshold ratio is S max : S min. 
5.2.3.3   Requirements  
     The detector should meet the requirements set out in Subsection 4 .2.2. 
5.2.3.4   Test equipment  
     Test equipment of infrared flame sample.  
5.2.4   Bearing test  
5.2.4.1   Purpose  
     To confirm the visual cone angle of the detector and to test the response 
performance of a sample at different angles within the visual  cone angle.  
5.2.4.2   Methods  
     Measure the D value of the sample at the response point according to the 
methods specified in Subsection 5.2.1.3. After taking each measurement, the sample 
should be rotated at an angle, making the included angles betwee n the axes and optical axes of detectors 0o, 0o, 15o, 30o and 45o. Among these values, the maximum 
value is D max, the minimum value is D min, and the calculated response threshold ratio 
is S max : S min. 
5.2.4.3   Requirements  
     The detector should meet th e requirements set out in Subsection 4.2.3.  
5.2.4.4   Equipment  
     Test device of infrared flame sample.  
5.2.5   Electrification test  
5.2.5.1   Purpose  
     To test the stability of the continuous operation of the detector when operating 
under normal atm ospheric conditions.  
5.2.5.2   Methods  
     Allow the sample to operate under normal surveillance mode for 7 days 
continuously. After the test, the D value of the sample at the response point should be 
measured according to the methods specified in Subsect ion 5.2.1.3. This value is 
compared with the D value of this sample at the response point in the consistency test.  
The maximum value is D max, the minimum value is D min, and the calculated response 
threshold ratio is S max : S min. 
5.2.5.3   Requirements  
The detector should meet the requirements set out in Subsection 4.2.4.  
5.2.5.4   Test equipment  
     Test device of infrared flame sample.  
5.2.6   Power -source parameter fluctuation test  
5.2.6.1   Purpose  
     To test the adaptability of the detector to the c hange of power -source parameter.  
5.2.6.2   Methods  
     Allow the rated voltage of the working voltage ratio of the sample to be reduced 
by 15% and increased by 10% respectively. Measure the D value of the sample at the 
response point according to the meth ods specified in Subsection 5.2.1.3. This value is 
compared with the D value of this sample at the response point in the consistency test.  
Among these 3 values, the maximum value is D max, the minimum value is D min, and 
the calculated response threshold ra tio is S max : S min. 
5.2.6.3   Requirements  
     The detector should meet the requirements set out in Subsection 4.2.5.  
5.2.4.4   Equipment  
     Test device of infrared flame sample.  
5.2.7   Environmental beam interference test  
5.2.7.1   Purpose       To tes t the performance stability of the detector under environmental beam 
action.  
5.2.7.2   Methods  
5.2.7.2.1   Installation of sample  
     The environmental beam interference simulation device is placed between the 
sample and the light source of the test devic e of the ultraviolet flame sample (as 
shown in Figure 3), making it at a distance of 500mm from the sample.  
 
 
 
 
 
1 – incandescent lamps; 2 – ringed fluorescent lamp; 3 -- sample  
Figure 3   Structural diagram of environmental beam interference simulation 
device  
5.2.7.2.2   Test procedures:  
     a) all of the lamps should be turned off;  
b) turn on two 25W incandescent lamps (colour temperature at 2850K ± 100K) 
for 1 second and then turn off for 1 second, and repeat 20 times;  
c) allow a 30W ring -shaped fluor escent lamp with a diameter of 308mm to be 
turned on for 1 second and turned off for 1 second, and repeat 20 times;  
d) allow the abovementioned incandescent lamps and fluorescent lamp to be 
turned on for 2 hours. Measure the D value at the response point a ccording to the 
methods specified in Subsection 5.2.1.3;  
e) all of the lamps should be turned off;  
f) measure the D value at the response point according to the methods specified 
in Subsection 5.2.1.3.  
5.2.7.2.3   Calculation of response threshold ratio  
Measure the D value of sample at the response point according to the methods 
specified in Subsection 5.2.1.3. This value is compared with the D value of this 
sample at the response point in the consistency test. The maximum value is D max, the 
minimum value i s D min, and the calculated response threshold ratio is S max : S min. 
5.2.7.3   Requirements  
     The detector should meet the requirements set out in Subsection 4.2.6.  
5.2.7.4   Test equipment  
     Test device of infrared flame sample, and the environmental  beam interference 
simulation device.  
5.3   Basic performance tests of aspirated smoke detector  Image – Figure 3  5.3.1   Performance tests of main parts  
5.3.1.1   Purpose  
     To inspect the performances of the main parts of the detector.  
5.3.1.2   Methods  
5.3.1.2.1   Insp ect and record the colour identification, visibility and function of the 
indicating light and displayer.  
5.3.1.2.2   Inspect and record the parameter indication of the fuse of the sample, and 
its actual capacity value.  
5.3.1.2.3   Inspect and record the in dication of different switches and buttons on the 
sample.  
5.3.1.2.4    Inspect and record the indication of the wiring terminal of the sample.  
5.3.1.2.5   Inspect and record the marking of the aspiration pipe of the sample.  
5.3.1.2.6    Put the sample into f ire alarm mode. Measure and record the sound 
pressure grade of the sound alarm signal of the sample, and then reduce the voltage of 
power to 85% of the rated voltage. Observe and record the sound alarm signal of the 
sample.  
5.3.1.3   Requirements  
     The detector should meet the requirements set out in Subsection 4.3.1.  
5.3.2   Basic performance tests  
5.3.2.1   Purpose  
   To inspect the basic performance of the detector  
5.3.2.2   Methods  
5.3.2.2.1    Allow the smoke parameter sample of the sample acquired a t any 
sampling hole to reach the concentration with alarm turned on. Observe and record 
any changes that appear, the fire alarm situation and time interval of the sample.  
5.3.2.2.2    Allow the aspiration flow of the aspiration pipe of the detector to be 
greater than 150% of normal aspiration flow and lower than 50% of normal aspiration 
flow respectively. Observe and record the sample’s malfunction sound, light signal, 
and the time interval during malfunction.  
5.3.2.2.3    At 1m directly in front of the sampl e, the sound pressure grades 
(weighted A) of the fire alarm sound signal and malfunction sound signal should be 
measured respectively.  
5.3.2.2.4   Allow signals to be sent out by the sample. Observe and record the fire 
alarm sound and light signal sent out  by the sample, as well as timing. Manually 
disable the fire alarm sound signal. Allow the detector with multiple fire alarm 
function to send out fire alarm signal. Inspect the noise damping function and the fire 
alarm function of the sample.  
5.3.2.2.5    T est the function of each malfunction item of the sample. Observe and record the sample’s malfunction sound, light signal, the time interval during 
malfunction, and classify the types of malfunction. Manually remove the malfunction 
sound signal, and allow a nother part send out the malfunction signal. Inspect the noise 
damping function and the sample’s malfunction sound signal’s restart function.  
5.3.2.2.6    Place the sample firstly into malfunction mode, and then into fire alarm 
mode. Observe and record the alarm priority of the sample.  
5.3.2.2.7    When the sample is operating in normal surveillance mode, cut off the 
main power source of the sample. Allow the sample to be supplied with reserve power.  
Resume the main power supply again. Inspect and record the  transformation of the 
main/reserve power source of the sample, the indication of the modes, and the 
over-current protection of the main power source.  
5.3.2.2.8    Allow the reserve power of the sample to be discharged to the end 
voltage, and then charged f or 24 hours. Turn off the main power of the sample.  
After 8 hours, place the detector into fire alarm mode for 30 minutes. Observe and 
record the modes of the sample respectively.  
5.3.2.2.9    Manually operate the self -inspection mechanism of the sample.  
Observe and record the fire alarm sound, light signal and output junction action. For 
samples with self -inspection time exceeding 1 minute or that are unable to stop the 
self-inspection function automatically, place any single non -self-inspection part into  
fire alarm mode during the self -inspection period. Observe and record details about 
the fire alarm.  
5.3.2.2.10    Observe and record the operation for the restoration of the sample.  
5.3.2.2.11    Observe and record the power on/off of the sample.  
5.3.2.3   Requirements  
     The basic performance of the sample should meet the requirements set out in 
Subsection 4.3.2.  
5.3.3   Repetitiveness test  
5.3.3.1   Purpose  
     To inspect the consistence of the response threshold values of a single detector 
during multi ple alarms.  
5.3.3.2   Methods  
5.3.3.2.1    Measure the response threshold value of the sample at a random sampling 
hole of a normal operating position 6 times, one after the other.  
5.3.3.2.2   Among the 6 response threshold values, the maximum value is expr essed 
as mmax, and the minimum value is expressed as  mmin. 
5.3.3.3   Requirements  
     The detector should meet the requirements set out in Subsection 4.3.4.  
5.3.3.4   Equipment       Inspection device of the response threshold value, with its measurement r ange 
at 0.01%obs/m ~ 20%obs/m and measurement error smaller than ± 5%.  
5.3.4   General tests  
5.3.4.1   Purpose  
     To test the consistency of the response threshold values of the detector.  
5.3.4.2   Methods  
5.3.4.2.1    Sequentially measure the response th reshold values of 4 samples 
according to the requirements set out in Subsections 5.1.2 and 5.1.6.  
5.3.4.2.2    Calculate the average value of the response threshold values of the 4 
samples, and express it by mrep. 
5.3.4.2.3    Among the 4 samples, the maximu m response threshold value is 
expressed as mmax, and the minimum response threshold value is expressed as mmin. 
5.3.4.3   Requirements  
     The detector should meet the requirements set out in Subsection 4.3.5.  
5.3.4.4   Equipment  
     Inspection device of  response threshold value, with its measurement range at 
0.01%obs/m ~ 20%obs/m and measurement error smaller than ± 5%.  
5.3.5   Power -source parameter fluctuation test  
5.3.5.1   Purpose  
     To inspect the stability of the response threshold value of the d etector under the 
fluctuation condition of power -source parameter.  
5.3.5.2   Methods  
5.3.5.2.1   Test -type detector  
     Supply power to the sample according to the upper and lower limits of the 
power supply parameter as specified by the manufacturer (e.g.  if no condition is 
specified, the upper and lower limit parameters are 110% and 85% of the rated 
parameter respectively), and measure the response threshold values respectively.  
These values are compared with the response threshold value of this sample i n the 
consistency test. Among these 3 values, the maximum response threshold value is 
expressed as mmax, and the minimum response threshold value is expressed as mmin.  
5.3.5.2.2   Detect -alarm -type detector  
     Adjust the test device. Measure the respons e threshold values respectively after 
allowing the input voltages of the samples be 187V (50Hz) and 242V (50Hz), or 
according to the upper and lower limits of the rated working voltage specified by the 
manufacturer. Compare the measured response threshold values with the response 
threshold value of this sample in the consistency test. Among these 3 values, the 
maximum response threshold value is expressed as mmax, and the minimum response 
threshold value is expressed as mmin. 5.3.5.3   Requirements  
     The  detector should meet the requirements set out in Subsection 4.3.6.  
5.3.4.4   Equipment  
     Inspection device of response threshold value, with its measurement range at 
0.01%obs/m ~ 20%obs/m and measurement error smaller than ± 5%.  
5.3.6   Insulation resi stance test  
5.3.6.1   Purpose  
     To inspect the insulation performance of the detector.  
5.3.6.2   Methods  
     Apply 500V ± 50V DC voltage at the following parts of the sample respectively.  
After the situation is sustained for 60s ± 5s, measure the insu lation resistance values:  
     a.  between the frame and the externally charged terminal with insulation 
requirement;  
     b.  between the power plug (or the wiring terminal of power source) and the 
frame (the power switch is situated at the connected posi tion, but the power plug is 
not inserted in the electric network).  
5.3.6.3   Requirements  
     The detector should meet the requirements set out in Subsection 4.3.7.  
5.3.4.4   Test equipment  
     The insulation resistance test equipment should meet the fol lowing technical 
requirements:  
     –– test voltage:  DC 500V ± 50V (the earth terminal is a metal plate);  
     –– measurement range: OM  ~ 500 OM; minimum graduation: 0.1 M; 
timing: 60s ± 5s.  
5.3.7   Current leakage test  
5.3.7.1   Purpose  
     To inspect the current leakage resistance of the detector.  
5.3.7.2   Methods  
     Place the sample into normal surveillance mode. Adjust the volt age of the main 
power supply to be 1.06 times of the rated voltage. Measure and record the total 
current leakage value.  
5.3.7.3   Requirements  
     The detector should meet the requirements set out in Subsection 4.3.8.  
5.3.7.4   Test equipment  
     The cir cuit with the measured current leakage meeting the requirements set out 
in Annex G of GB4706.1.  
5.3.8   Power source transient test  
5.3.8.1   Purpose       To inspect the resistance of the detector to power source transient interference.  
5.3.8.2   Methods  
5.3.8.2.1    Connect the sample with the equivalent load according to the 
requirements in normal surveillance mode. Connect the sample to the power source 
transient test device, under normal surveillance mode.  
5.3.8.2.2    Turn on the test device. Allow the m ain power source of the detector 
perform continuous connection 500 times according to the fixed procedures of 
“connection (9s) ~ disconnection (1s).” During the test period, observe and record the 
working mode of the sample. After the test, a function test  is performed according to 
Subsection 5.2.  
5.3.8.2.3    Measure the response threshold value according to the requirements.  
The measured response threshold value is compared with the response threshold value 
of this sample in the consistency test. The grea t response threshold value is expressed 
as mmax, and the small response threshold value is expressed as mmin. 
5.3.8.3   Requirements  
     The detector should meet the requirements set out in Subsection 4.3.9.  
5.3.8.4   Test equipment  
     The power source device that can create the test conditions meeting the 
requirements set out in Subsection 5.3.8.2.  
5.3.9    Immunity tests of temporary reduction, short -term termination and voltage 
change  
5.3.9.1   Purpose  
     To inspect the immunity ability under tempor ary reduction, short -term 
termination and change of voltage to the detector (e.g. the change is caused by the 
actions of load switch and component protection in the main distribution network).  
5.3.9.2   Methods  
5.3.9.2.1   According to normal surveillance mode, the sample is connected with the 
equivalent load, and with the falling and termination test device of main voltage, 
making it operate in normal surveillance mode.  
5.3.9.2.2   Allow the main voltage to fall by 60%, and sustain for 20 minutes. 
Repeat 1 0 times. Allow the main voltage to fall by 100%, and sustain for 10 minutes.  
Repeat the action 10 times. During the test period, observe and record the working 
mode of the sample. After the test, a function test is performed according to 
Subsection 5.3.2.  
5.3.9.2.3    Measure the response threshold value according to the requirements.  
The measured response threshold value is compared with the response threshold value 
of this sample in the consistency test. Among the values, the great response threshold 
value is expressed as mmax, and the small response threshold value is expressed as mmin. 
5.3.9.3   Requirements  
     The detector should meet the requirements set out in Subsection 4.3.2.  
5.3.9.4   Test equipment  
     The test equipment should meet the relat ed requirements of GB16838.  
5.4   Basic performance tests for image -type fire detector  
5.4.1   Response threshold value test  
5.4.1.1   Purpose  
     To inspect the response time of the detector to the specified test fire, and its 
positioning accuracy.  
5.4.1 .2   Methods  
5.4.1.2.1    Take a set of samples and 4 sets of lenses of different focuses (4mm, 
6mm, 8mm and 12mm) to perform the test.  
5.4.1.2.2    Use a lens with a focus 4mm. After the sample is connected with the 
matched control and indicating equipment,  allow the system to operate in surveillance 
mode.  
5.4.1.2.3    Place the test burning plate 25m from the front end of the sample. Allow 
the test burning plate to be situated within the visual field of the video camera.  
Ignite the burning liquid. After the  height of the flame stabilises, Grade 1 fire 
prevention operation is performed. Observe and record the sound and light alarm 
situations, the alarm response time and the fire coordinates.  
5.4.1.2.4   Place the test burning plate 25m from the front end of t he sample. Allow 
the test burning plate to be situated within the visual field of the video camera.  
Ignite the burning liquid. After the height of the flame stabilises, perform Grade 2 fire 
prevention operation. Observe and record details of the sound and  light alarm, the 
alarm response time and the fire coordinates.  
5.4.1.2.5   Use lenses of different focuses (4mm, 6mm, 8mm and 12mm) and pick, 
from Table 8, the dimensions of the corresponding burning plates. Repeat the test 
procedures set out in Subsectio ns 5.4.1.2.2 ~ 5.4.1.2.4.  
5.4.1.2.6   Positioning accuracy  
     |rX| = |x1 – x2|, |rY| = |y1 – y2| 
     In the test, (x 1, y1) are the coordinates of the centre of burning plate, and (x 2, y2) 
are the coordinates of the displayed fire of the control mainfram e when the alarm is 
sent out.  
5.4.1.3   Requirements  
     The response threshold value of the detector should meet the requirements set 
out in Subsection 4.4.1.  
5.4.1.4   Test equipment       The test equipment is shown in Figure 4. It comprises the test t urning plate, 
timer, measuring scale, installation stand, etc.:  
     a) Test flame  
     The test flame adopts the burning flame of a blended fluid of kerosene and 
gasoline at a blending ratio of 10:1.  
b) Test burning plate  
The dimensions of test burning pl ate are shown in Table 8.  The depth of the 
burning plate is greater than 0.02m.  
c) Installation height  
The installation height of the sample is 4m. At the same time, the sample should 
be able to rotate at the angle of 90o upward and downward, and 180o leftward and 
rightward.  
d) Test place  
The test place is a space with a length no less than 25m, width no less than 5m, 
and height no less than 6m, as shown in Figure 4.  
 
 
                Image -type fire detector  
 
                              Test burning  plate  
 
 Connection wire  
                                     Control mainframe system  
 
Figure 4 Schematic diagram of test equipments and place  
5.4.2   Repetitiveness test  
5.4.2.1   Purpose  
     To inspect the stability of the continuous operation of t he detector.  
5.4.2.2   Methods  
5.4.2.2.1    Connect the sample to the matched control and indicating equipment.  
5.4.2.2.2   Measure the response time 3 times according to the requirements set out 
in Subsection 5.4.1.2. The time interval between two measurem ents should not be less 
than 10 minutes, but should not be greater than 1 hour. After the last measurement, the 
mode of the sample should remain unchanged.  
5.4.2.2.3    Supply uninterrupted power to the sample for 7 days, after which time the 
response time should be measured 3 times according to the requirements set out n 
Subsection 5.4.1.2 . The time interval between two measurements should not be less 
than 10 minutes, but should not be greater than 1 hour.  5.4.2.3   Requirements  
     The detector should mee t the requirements set out in Subsection 4.4.2.  
5.4.3   Power -source parameter fluctuation test  
5.4.3.1   Purpose  
     To inspect the adaptability of the detector to the change of power -source 
parameter.  
5.4.3.2   Test methods  
5.4.3.2.1   Sample supplied with power of DC constant voltage  
     Connect the sample to the matched control and indicating equipment. Reduce 
the rated working voltage by 15% and increase by 10% respectively, or measure the 
response time of the sample according to the upper and lower  limits of the rated 
working voltage specified by the manufacturer and according to the requirements set 
out in Subsection 5.4.1.2.  
5.4.3.2.2   Sample supplied with power of pulse voltage  
     Pass the sample through a copper double twisted lead wire with a length of 
1000m and cross -section area of 1.0mm2 (or according to the conditions provided by 
the manufacturer), and connect with the matched control and indicating equipment.  
Reduce the rated working voltage by 15% and increase by 10% respectively, or 
measure the response time of sample according to the upper and lower limits of the 
rated working voltage specified by the manufacturer.  
5.4.3.3   Requirements  
     The detector should meet the requirements set out in Subsection 4.4.3.  
5.4.4   Environmental beam interference test  
5.4.4.1   Purpose  
     To test the performance stability of the detector under environmental beam 
action.  
5.4.4.2   Methods  
     Fix the sample to the fixed surface of the installation stand according to the 
normal operating position , and connect it to the control and indicating equipment, so 
it is under normal surveillance mode. Place the environmental beam interference 
simulation device (simply called beam interference device, as shown in Figure 5) at a 
distance of 500mm from the sa mple.  
Test procedures:  
     a) none of the lamps are turned on;  
b) use two 25W incandescent lamps (the colour temperature at 2850K ± 100K), 
which should be turned on for 1 second and turned off for 1 second, repeating 20 
times.  
c) turn on a 30W ring -shaped  fluorescent lamp at a diameter of 308mm for 1 second then turn off for 1 second, and repeat 20 times.  
d) turn on the abovementioned incandescent lamps and fluorescent lamp for 2 
hours. Measure the response threshold value of the sample during the test per iod. 
e) none of the lamps are turned on;  
f) measure the response threshold value of sample according to the methods 
specified in Subsection 5.4.1.2.  
5.4.4.3   Requirements  
     The detector should meet the requirements set out in Subsection 4.4.4.  
5.4.4.4   Test equipment  
a) 25W incandescent lamps are installed at the place shown in Figure 5.  
Before use, they should undergo charging for 1 hour. The accumulated time of use 
should not exceed 750 hours.  
b) 30W ring -shaped fluorescent lamp is installed at the place shown in Figure 5.  
Before use, it should undergo charging for 100 hours. The accumulated time of use 
should not exceed 2000 hours.  
Unit:  mm  
 
 
 
 
 
1 – incandescent lamps; 2 -- ring-shaped fluorescent lamp; 3 – sample  
Figure 5   Structural diagram o f environmental beam interference test 
equipment  
5.5   Basic performance tests of point -type carbon monoxide fire detector  
5.5.1   Basic performance tests of independent detector  
5.5.1.1   Purpose  
     To inspect the basic performance of independent detec tors 
5.5.1.2   Methods  
5.5.1.2.1   Place the sample in fire alarm mode. Observe and record the sound and 
light alarm signals of the sample.  
5.5.1.2.2   At 1m right in front of the sample, measure the sound pressure grade 
(weighted A) of the sound alarm sig nal. 
5.5.1.2.3    Operate the self -inspection of the sample. Observe and record the sound 
and light alarm signals of the sample.  
5.5.1.2.4    Observe and record the colour identification of the indicating light of the 
sample.  
5.5.1.2.5    For alarms that are not supplied with power from an internal battery, the Image: Figure 5  polarity of the external power wire should be reversely connected. Maintain this 
situation for 2 hours unless the alarm sends out a malfunction or fire alarm signal. If 
the alarm is interconnected durin g use, the connection wire between them should also 
undergo reverse connection.  
5.5.1.2.6    For alarms that are powered by the battery (including the reserve battery), 
if permitted by the structure of the alarm, the battery should be reversely connected 
with the connection terminal of the battery on the alarm. Maintain this situation for 2 
hours unless the alarm sends out a malfunction or fire alarm signal.  
5.5.1.2.7   Supply an alarm that is powered by battery (including reserve battery) 
with a malfunction  voltage. Observe whether the alarm sends out a malfunction 
signal.  
5.5.1.2.8   Following the above operation, the power of the alarm should be 
reconnected. Inspect the basic functions of the sample according to the requirements 
set out in Subsections 5.5. 1.2.1 - 5.5.1.2.6.  
5.5.1.3   Requirements  
     The detector should meet the requirements set out in Subsection 4.5.3.  
5.5.2   Gas interference test  
5.5.2.1   Purpose  
     To inspect the anti -misdeclaration ability of detector when exposed to 
non-carbon -monoxide gas with specific concentration.  
5.5.2.2   Methods  
5.5.2.2.1   Place the sample in normal surveillance mode and allow it to operate 
stably for at least 15 minutes according to Subsections 4.5.1.2 - 4.5.1.3. If the 
response threshold value of the samp le is adjustable, the response threshold value of 
the sample should be preset to the smallest value.  
5.5.2.2.2    Exposed the sample to the gas with concentration specified in Table 11 
for 1 hour.  
5.5.2.3   Requirements  
     The detector should meet the req uirements set out in Subsection 4.5.4.  
5.5.3   Repetitiveness test  
5.5.3.1   Purpose  
     To inspect the consistency of the response threshold values of the detector over 
several alarm signals.  
5.5.3.2   Methods  
5.5.3.2.1   Measure the response threshold v alue of a sample in a random bearing of 
a normal operating position 6 times continuously according to the requirements set 
out in Subsection 4.5.1 or 4.5.2.  
5.5.3.2.2   Among the 6 response threshold values, the maximum value is expressed as S max, and the minimum value is expressed as S min. 
5.5.3.3   Requirements  
     The detector should meet the requirements set out in Subsection 4.5.5.  
5.5.4   Bearing test  
5.5.4.1   Purpose  
     To inspect the aspiration performance of the detector in different bearings, and 
to confirm “the most favourable” and “the most unfavourable” bearings for the 
response of detector.  
5.5.4.2   Methods  
5.5.4.2.1    Measure the response threshold value according to the requirements set 
out in Subsection 4.5.1 or 4.5.2. After a test is c ompleted once, the sample should 
rotate 45o in the same direction around its vertical axis. The measurement should be 
taken 8 times.  
5.5.4.2.2    Record the corresponding bearings of the maximum response threshold 
value and the minimum response threshold va lue of the sample. In the subsequent 
tests, these two bearings are called “the most unfavourable” and “the most 
favourable” bearings respectively.  
5.5.4.3   The maximum response threshold value is expressed as S max, and the 
minimum response threshold value  is expressed as S min. 
5.5.4.4   Requirements  
     The detector should meet the requirements set out in Subsection 4.5.6.  
5.5.5   Consistency test  
5.5.5.1   Purpose  
     To inspect the consistency of the response threshold values of multiple 
detectors.  
5.5.5.2   Methods  
5.5.5.2.1    Sequentially measure the response threshold values of 16 samples 
according to the requirements set out in Subsection 4.5.1 or 4.5.2.  
5.5.5.2.2    Calculate the average value of the response threshold values of the 16 
samples, and express it by S rep. 
5.5.5.2.3   Among the 16 samples, the maximum response threshold value is 
expressed as S rmax, and the minimum response threshold value is expressed as S rmin. 
5.5.5.3   Requirements  
     The detector should meet the requirements set out in Subsection 4.5.7.  
5.5.6   Long -term stability  
5.5.6.1   Purpose  
     To inspect the long -term running stability of the detector under normal 
atmospheric conditions.  5.5.6.2   Methods  
5.5.6.2.1   Under the atmospheric conditions specified in Subsection 5 .1.1, place the 
sample in normal surveillance mode according to the requirements set out in 
Subsection 5.1.2, and maintain the situation for 3 months.  
5.5.6.2.2   Measure the response threshold value of sample according to the 
requirements set out in Subse ction 4.5.1 or 4.5.2. The value should be compared with 
the response threshold value of this sample in the consistency test. Among them, the 
maximum response threshold value is expressed as S max, and the minimum response 
threshold value is expressed as S min. 
5.5.6.3   Requirements  
     The detector should meet the requirements set out in Subsection 4.5.8.  
5.5.7   High concentration flooding test  
     To inspect the adaptability of the detector to operation under high -concentration 
carbon monoxide gas.  
5.5.7 .2   Methods  
5.5.7.2.1    The sample should be installed in the gas inspection device according to 
the requirements set out in Subsection 5.1.2.  
5.5.7.2.2    Before testing, the concentration of carbon monoxide inside the gas test 
device and the sample shoul d be lower than 5ul/l. Allow the sample to operate stably 
under normal surveillance mode for at least 15 minutes.  
5.5.7.2.3    Increase the concentration of carbon monoxide inside the gas inspection 
device to 500ul/l at a speed of 5ul/l/min., and maintain t he situation for 2 hours.  
5.5.7.2.4    After the sample has resumed to normal atmospheric conditions for 4 
hours, the response threshold value of the sample should be measured according to the 
requirements set out in Subsection 4.5.1 or 4.5.2. Measure the r esponse threshold 
value of the sample according to the requirements set out in Subsection 4.5.1 or 4.5.2.  
The value should be compared with the response threshold value of this sample in the 
consistency test. Among them, the great response threshold value  is expressed as S max, 
and the small response threshold value is expressed as S min. 
5.5.7.3   Requirements  
     The detector should meet the requirements set out in Subsection 4.5.9.  
5.5.8   Carbon monoxide response sensitivity  
5.5.8.1   Purpose  
     To i nspect the response sensitivity of the detector when coexisting with carbon 
monoxide and other gases.  
5.5.8.2   Methods  
5.5.8.2.1    Install the sample in the gas inspection device according to the 
requirements set out in Subsection 5.1.2.  5.5.8.2.2    Befor e testing, the concentration of carbon monoxide inside the gas test 
device and the sample should be lower than 5ul/l. Allow the sample to work stably 
under normal surveillance mode for at least 15 minutes.  
5.5.8.2.3   Increase the concentration of carbon m onoxide inside the gas inspection 
device to 70ul/l. Allow other interference gases keep at the concentrations given in 
Table 10 for 1 hour.  
5.5.8.3   Requirements  
     The detector should meet the requirements set out in Subsection 4.5.10.  
5.5.9   Power -source parameter fluctuation test  
5.5.9.1   Purpose  
     To inspect the stability of response threshold value of the detector under the 
fluctuation condition of power -source parameter.  
5. 5.9.2   Methods  
5.5.9.2.1   Detectors supplied with constant voltage p ower  
     Supply power to the sample according to the upper and lower limits of the 
power supply parameter specified by the manufacturer (e.g. if there is no condition 
specified, the upper and lower limit parameters are 110% and 85% of the rated 
parameter respectively), and measure the response threshold values respectively 
according to the requirements set out in Subsection 4.5.1 or 4.5.2. These values 
should be compared with the response threshold value of this sample in the 
consistency test. Among these 3 values, the maximum response threshold value is 
expressed as S max, and the minimum response threshold value is expressed as S min. 
5.5.9.2.2   Detectors supplied with power of pulse voltage  
     Allow the sample to pass the copper -made twin twisted lead w ire at a length of 
1000m and cross -section area of 1.0mm2 (or according to the conditions provided by 
the manufacturer), and connect with the matched control and indicating equipment.  
The sample should be in normal surveillance mode. Adjust the test devic e. Allow the 
input voltages of the control and indicating equipment to be 187V (50Hz) and 242V 
(50Hz) respectively. Measure the response threshold values of the sample respectively 
according to the requirements set out in Subsection 4.5.1 or 4.5.2. These v alues 
should be compared with the response threshold value of this sample in the 
consistency test. Among these 3 values, the maximum response threshold value is 
expressed as S max, and the minimum response threshold value is expressed as S min. 
5.5.9.3   Req uirements  
     The detector should meet the requirements set out in Subsection 4.5.11.  
5.5.10   Airflow test  
5.5.10.1   Purpose  
     To test the immunity of the detector to airflow interference and the stability of response threshold values under the airfl ow interference condition.  
5.5.10.2   Test methods  
     Under the condition that the airflow velocity around the sample is (0.2 ± 0.04) 
m/s, the response threshold values in “the most unfavourable” and “the most 
favourable” bearings should be respectively measured, being expressed as S (0.2) max (1), 
S (0.2) min respectively. Under the condition that the airflow velocity surrounding the 
sample is (1.0 ± 0.02) m/s, the above test should be repeated. The response threshold 
values are expressed as S (1.0) max (2), and S (1.0) min respectively.  
Note 1:  The subscript 0.2 refers that the airflow velocity is (0.2 ± 0.04) m/s.  
      Note 2:  The subscript 1.0 refers that the airflow velocity is (1.0 ± 0.2) m/s.  
5.5.10.3   Requirements  
     The detector should meet the requirements set out in Subsection 4.5.12.  
5.6   High temperature (running) test  
5.6.1   Purpose  
     To inspect the adaptability of the detector when used in high temperatures.  
5.6.2   Methods  
5.6.2.1   Place the sample and its base in the high temper ature test box. Connect to 
the control and indicating equipment, making them operate under normal surveillance 
mode.  
5.6.2.2   Under the condition that the temperature is 23oC ± 5oC, the temperature is 
increased to 55oC ± 2oC at a temperature increase spee d of no greater than 0.5oC/min.  
Maintain this condition for 2 hours. During the test period, observe and record the 
working mode of the sample.  
5.6.2.3   After the test, the sample should be removed, and placed under normal 
atmospheric conditions for 1 ho ur, after which time the response threshold value 
should be measured according to the corresponding methods specified in Subsections 
5.2.1.3, 4.3.3.2, 5.4.1.2, 4.5.1 and 4.5.2.  
5.6.3   Requirements  
     The detector should meet the requirements set out in Subsection 4.1.7.1.  
5.6.4   Test equipment  
     The test equipment should meet the related requirements set out in GB 16838.  
5.7   Low temperature (running) test  
5.7.1   Purpose  
     To inspect the adaptability of the detector when used in low temperatures . 
5.7.2   Methods  
5.7.2.1   Place the sample and its base in the low temperature test box. Connect to 
the control and indicating equipment, making them operate under normal surveillance 
mode.  . 
5.7.2.2    Retain the sample under a temperature of 15oC - 20oC with a relative 
humidity not greater than 70%, for 1 hour, after which time the temperature should be 
reduced to -10oC ± 3oC at a temperature reduction speed of no greater than 0.5oC/min.  
Retain at this condition for 2 hours (the sample should not freeze ). During the test 
period, observe and record the operation of the sample.  
5.7.2.3    When the test is complete, the sample should be removed and placed in 
normal atmospheric conditions for 1 hour, after which time the response threshold 
value should be mea sured according to the corresponding methods specified in 
Subsections 5.2.1.3, 4.3.3.2, 5.4.1.2, 4.5.1 and 4.5.2.  
5.7.3   Requirements  
     The detector should meet the requirements set out in Subsection 4.1.7.1.  
5.7.4   Test equipment  
     The test equipm ent should meet the related requirements set out in GB 16838.  
5.8   Steady -state damp heat (running) test  
5.8.1   Purpose  
     To inspect the adaptability of the detector when used in environments with high 
humidity.  
5.8.2   Methods  
5.8.2.1    Place the sam ple and its base in the damp heat test box. Connect to the 
control and indicating equipment under normal surveillance mode.  
5.8.2.2   Adjust the damp heat test box. Retain the sample under a temperature of 
40oC ± 2oC and relative humidity of 93% ± 3% for 4  days continuously. During the 
test period, observe and record the operation of the sample.  
5.8.2.3   After the test, the sample should be removed and placed under normal 
atmospheric conditions for 1 hour, after which time the response threshold value 
shou ld be measured according to the corresponding methods specified in Subsections 
5.2.1.3, 4.3.3.2, 5.4.1.2, 4.5.1 and 4.5.2.  
5.8.3   Requirements  
     The detector should meet the requirements set out in Subsection 4.1.7.1.  
5.8.4   Test equipment  
     The te st equipment should meet the related requirements set out in GB 16838.  
5.9   Steady -state damp heat (durability) test  
5.9.1   Purpose  
     To inspect the resistance of the detector when used in environments of high 
humidity.  
5.9.2   Methods  
5.9.2.1   Place  the sample and its base in the damp heat test box.  5.9.2.2    Adjust the damp heat test box. Retain the sample under a temperature of 
40oC ± 2oC and relative humidity of 93% ± 3% for 21 days continuously.  
5.9.2.3   After the test, remove the sample and pla ced under normal atmospheric 
conditions for 1 hour, after which time the response threshold value should be 
measured according to the corresponding methods specified in Subsections 5.2.1.3, 
4.3.3.2, 5.4.1.2, 4.5.1 and 4.5.2.  
5.9.3   Requirements  
     The d etector should meet the requirements set out in Subsection 4.1.7.2.  
5.9.4   Test equipment  
     The test equipment should meet the related requirements set out in GB 16838.  
5.10   Corrosion test  
5.10.1   Purpose  
To inspect the corrosion resistance of the d etector.  
5.10.2   Methods  
5.10.2.1    Place the sample and its base in the corrosion test box.  
5.10.2.2    Apply the following tests of astringent grade towards the sample:  
a) Temperature:  25oC ± 2oC; 
b) Relative humidity:  90% ~ 96%;  
c) SO 2 concentration:  (25 + 5) × 10-6 (specific volume);  
d) Test period:  21 days.  
5.10.2.3  After the test, remove the sample and placed under normal atmospheric 
conditions for 1 hour, after which time the response threshold value should be 
measured according to the correspond ing methods specified in Subsections 5.2.1.3, 
4.3.3.2, 5.4.1.2, 4.5.1 and 4.5.2.  
5.10.3   Requirements  
     The detector should meet the requirements set out in Subsection 4.1.7.2.  
5.10.4   Test equipment  
     The test equipment should meet the related req uirements set out in GB 16838.  
5.11   Vibration (sine) (running) test  
5.11.1   Purpose  
     To inspect the ability of the detector after having been under the influence of 
vibration for a long time.  
5.11.2   Methods  
5.11.2.1    Place the sample and its base  on the vibration test platform. Connect to the 
control and indicating equipment under normal surveillance mode.  
5.11.2.2    Carry out frequency scanning cycle once on 3 mutually vertical axes 
sequentially, with a frequency circulation range of 10Hz - 150Hz , an acceleration 
amplitude of 5m/s2, and at the frequency scanning speed of 1 octave/min.  5.11.2.3    After the vibration, the response threshold value is measured according to 
the corresponding methods specified in Subsections 5.2.1.3, 4.3.3.2, 5.4.1.2, 4 .5.1 and 
4.5.2.  
5.11.3   Requirements  
     The detector should meet the requirements set out in Subsection 4.1.8.1.  
5.11.4   Test equipment  
     The test equipment should meet the related requirements set out in GB 16838.  
5.12   Impact test  
5.12.1   Purpo se 
     To inspect the immunity of the detector to non -recurring mechanical impacts.  
5.12.2   Test methods  
5.12.2.1   Place the sample and its base on the impact test platform. Connect to the 
control and indicating equipment under normal surveillance mode.  
5.12.2.2   When mass m(kg), for samples when m  4.75, the peak acceleration is 
(100 – 20m) × 10 m/s2; when m > 4.75, the peak acceleration is 0, and the pulse 
duration is 6 minutes. Turn on the impact test platform and apply impact to the sample 
from 6 d irections.  
5.12.2.3    After the test, the response threshold value is measured according to the 
corresponding methods specified in Subsections 5.2.1.3, 4.3.3.2, 5.4.1.2, 4.5.1 and 
4.5.2.  
5.12.3   Requirements  
     The detector should meet the requirements set out in Subsection 4.1.8.1.  
5.12.4   Test equipment  
     The test equipment should meet the related requirements set out in GB 16838.  
5.13   Collision test  
5.13.1   Purpose  
     To inspect the reliability of the parts on the surface of the pipe -samplin g-type 
detector when collision occurs, and the adaptability of other kinds of detectors under 
mechanical impacts.  
5.13.2   Test methods  
5.13.2.1   For pipe -sampling -type detectors, place under normal surveillance mode 
according to the specified requirements . Each of the damageable parts on the surface 
of the sample (e.g. indicating lamp, displayer, etc.) should be applied with a collision 
with energy 0.5J ± 0.04J 3 times. During the test, the procedures should be carried out 
carefully, ensuring that the resu lts of the previous group (3 times) of collisions do not 
influence the results of the various subsequent groups of collision. When such 
influence is thought to be possibly caused, any discovered defects should not be 
considered. Take a new sample and carry  out a collision test at the same position once again. During the test period, observe and record the working operation of the sample.  
5.13.2.2   For other types of detector, allow them and their bases to be fixed on the 
horizontal installation plate of th e collision test platform at the normal working 
position according to the specified requirements. Connect to the control and indicating 
equipment under normal surveillance mode. Before carrying out the test, the sample 
should be electrified for at least 15  minutes.  
Adjust the collision test equipment. Allow the centre of the colliding side of 
hammerhead collide with the sample in horizontal direction, and aim at the part that 
can be most easily damaged, after which time a collision should be made with the 
sample once at the hammerhead speed of 1.5 m/s ± 0.125 m/s, and the collision 
energy 1.9J ± 0.1J. During the test period, observe and record the working mode of 
the sample.  
5.13.2.3    After the test, the response threshold value should be measured according  
to the corresponding methods specified in Subsections 5.2.1.3, 4.3.3.2, 5.4.1.2, 4.5.1 
and 4.5.2.  
5.13.3   Requirements  
     The detector should meet the requirements set out in Subsection 4.1.8.1.  
5.13.4   Test equipment  
     The collision test equipment  for pipe -sampling type aspirated smoke detector 
should meet the related requirements of National Standard GB 16838.  
     For test equipment for other types of detectors, the main body should be a 
pendulum mechanism. The hammerhead of the pendulum should b e made of hard 
aluminium alloy, AlCu 4SiMg (having gone through solid solution and ageing 
treatment). Its appearance should be a hexagon with a slanted collision surface. The 
pendulum bar of the hammerhead should be fixed on the steel wheel hub with ball 
bearing. The ball bearing should be installed on the fixed steel axle of the hard steel 
frame. The structure of the hard steel frame should guarantee that the pendulum can 
rotate freely before the sample is installed.  
     The dimensions of the hammerhead ar e: length 94mm, width 76mm, height 
50mm, and mass 0.79kg. The included angle between the slanted surface of 
hammerhead and the vertical axle should be 60o ± 1o. The pendulum bar of the 
hammerhead should have an outer diameter of 25mm ± 0.1mm and wall thick ness of 
1.6mm ± 0.1mm.  
     The radial distance between the vertical axle of hammerhead and the rotating 
axis is 305mm. It should be guaranteed that the pendulum bar axis of the hammerhead 
is vertical to the rotating axis. The steel wheel hub with outer di ameter of 102mm and 
length of 200mm should be concentrically assembled on the steel axle with diameter 
of 25mm. The accuracy of the diameter of steel axle should be determined by the dimension tolerance of the used bearing.  
     In the opposing direction o f the steel wheel hub and the pendulum bar two 
steel-made ballast arms with outer diameter of 20mm, length of 185 mm each and 
stretching length of 150mm should be installed. On the two ballast arms a ballast 
weight with adjustable positioning should be ins talled, so as to achieve a balance 
between the hammerhead and the ballast arms. On one end of the steel wheel hub an 
aluminium alloy pulley with a thickness of 12mm and a length of 150mm should be 
installed. A wire winds the pulley, with one end fixed on t he pulley and the other tied 
with the heavy working punch at a mass of around 0.55 kg.  
     The steel frame supports the horizontal installation plate of the installation 
sample. The installation plate can be adjusted upwards and downwards, so as for the 
centre of the colliding side of hammerhead to collide with the sample in horizontal 
direction.  
     When using the test equipment, the positions of the sample and the installation 
plate must firstly be adjusted according to Figure 6. After adjustment, the i nstallation 
plate is fixed on the steel frame. Remove the working heavy punch. The pendulum 
mechanism is balanced through the adjustment of the ballast weight. After it is 
adjusted and balanced, the pendulum bar is pulled to the horizontal position to tie with 
the working heaving punch. When the pendulum mechanism is released, the working 
heavy punch makes the hammerhead rotate for 270o to collide with the sample.  
Unit:  mm  
 
 
 
 
a – installation plate; b – sample; c – hammerhead; d – pendulum bar; e – steel wheel hub;  
f – ball bearing; g – rotation for 270o; h – working heavy punch; j – ballast weight;  
 k – ballast arm; l – pulley  
Figure 6   Structural diagram of collision test device  
5.14   Vibration (sine) (durability) test  
5.14   Purpose  
     To inspect  the ability of the detector after having been under the vibration 
influence for a long time.  
5.14.2   Methods  
5.14.2.1    Fix the sample and its base onto the vibration test platform.   
5.14.2.2    Carry out a frequency scanning cycle 20 times on 3 mutually  vertical axes 
sequentially, with a frequency circulation range of 10Hz - 150Hz, acceleration 
amplitude of 10m/s2, and at the frequency scanning speed of 1 octave/min.  5.14.2.3    After the test, the response threshold value is measured according to the 
corresponding methods specified in Subsections 5.2.1.3, 4.3.3.2, 5.4.1.2, 4.5.1 and 
4.5.2  
5.14.3   Requirements  
     The detector should meet the requirements set out in Subsection 4.1.8.2.  
5.14.4   Test equipment  
     The test equipment should meet the relat ed requirements set out in GB 16838.  
5.15   Immunity test of r adio-frequency  electromagnetic radiation  
5.15.1   Purpose  
     To inspect the adaptability of the detector when working in an environment 
with r adio-frequency  electromagnetic radiation.  
5.15.2   Methods  
5.15.2.1   Place the sample on the non -conducting support, and connect it to a power 
supply under normal surveillance mode for 15 minutes.  
5.15.2.2   According to the requirements set out in GB 16838, electromagnetic 
interference is applied on th e sample under the conditions specified in Table 5.  
5.15.2.3   During the interference period, observe and record the working mode of 
the sample.  
5.15.2.4    After the interference environment ends, the response threshold value 
should be measured according to the corresponding methods specified in Subsections 
5.2.1.3, 4.3.3.2, 5.4.1.2, 4.5.1 and 4.5.2.  
5.15.3   Requirements  
     The detector should meet the requirements set out in Subsection 4.1.9.  
5.15.4   Test equipment  
     The test equipment should meet the related requirements of GB 16838.  
5.16   Immunity test of conductive interference of r adio-frequency  field sensor  
5.16.1   Purpose  
     To inspect the adaptability of the detector when working in an environment 
with electromagnetic interference caused  by the r adio-frequency  transmitter.  
5.16.2   Methods  
5.16.2.1   Place the sample on the insulation platform, and connect it to a power 
supply under normal surveillance mode for 15 minutes.  
5.16.2.2    According to the requirements set out in GB 16838, elec tromagnetic 
interference is applied on the sample under the conditions specified in Table 5.  
5.16.2.3    During the interference period, observe and record the working mode of 
the sample.  
5.16.2.4    After the interference ends, the response threshold value should be 
measured according to the corresponding methods specified in Subsections 5.2.1.3, 4.3.3.2, 5.4.1.2, 4.5.1 and 4.5.2.  
5.16.3   Requirements  
     The detector should meet the requirements set out in Subsection 4.1.9.  
5.16.4   Test equipment  
     Th e test equipment should meet the related requirements of GB 16838.  
5.17   Immunity test of static discharge  
5.17.1   Purpose  
     To inspect the adaptability of the detector to the static discharge caused by the 
staff or objects carrying static electricit y.  
5.17.2   Methods  
5.17.2.1    Place the sample on the support frame at a distance of 0.8m from the 
grounding referential plane, and connect it to a power supply under normal 
surveillance mode for 15 minutes.  
5.17.2.2  Implement air discharge towards the s ample with insulated shell.  
Implement contact discharge towards the sample with conductive shell.  
5.17.2.3    According to the requirements set out in GB 16838, electromagnetic 
interference is applied on the sample under the conditions specified in Table 5 . 
5.17.2.4    During the interference period, observe and record the working operation 
of the sample.  
5.17.2.5    After the interference ends, the response threshold value should be 
measured according to the corresponding methods specified in Subsections 5.2 .1.3, 
4.3.3.2, 5.4.1.2, 4.5.1 and 4.5.2.  
5.17.3   Requirements  
     The detector should meet the requirements set out in Subsection 4.1.9.  
5.17.4   Test equipment  
     The test equipment should meet the related requirements set out in GB 16838.  
5.18   Imm unity test of electric speedy transient pulses  
5.18.1   Purpose  
     To inspect the immunity ability of detector to electric speedy transient pulses.  
5.18.2   Methods  
5.18.2.1   Place the sample on the insulation platform, and connect it to a power 
supply  under normal surveillance mode for 15 minutes.  
5.18.2.2   According to the requirements set out in GB 16838, electromagnetic 
interference is applied on the sample under the conditions specified in Table 5.  
5.18.2.3   During the interference period, observ e and record the working mode of 
the sample.  
5.18.2.4    After the interference ends, the response threshold value is measured 
according to the corresponding methods specified in Subsections 5.2.1.3, 4.3.3.2, 5.4.1.2, 4.5.1 and 4.5.2.  
5.18.3   Requirements  
     The detector should meet the requirements set out in Subsection 4.1.9.  
5.18.4   Test equipment  
     The test equipment should meet the related requirements set out in GB 16838.  
5.19   Immunity test of surging (impact)  
5.19.1   Purpose  
     To inspect  the adaptability of the detector to the lightning nearby or the power 
switch of power supply system and low -voltage network, including the voltage 
transient (electric surging) inference caused by the large -capacity load switch.  
5.19.2   Methods  
5.19.2.1   Place the sample on the insulation platform, and connect it to a power 
supply under normal surveillance mode for 15 minutes.  
5.19.2.2   According to the requirements set out in GB 16838, electromagnetic 
interference is applied on the sample under the con ditions specified in Table 5.  
5.19.2.3    During the interference period, observe and record the working operation 
of the sample.  
5.19.2.4   After the interference ends, the response threshold value should be 
measured according to the corresponding methods specified in Subsections 5.2.1.3, 
4.3.3.2, 5.4.1.2, 4.5.1 and 4.5.2.  
5.19.3   Requirements  
     The detector should meet the requirements set out in Subsection 4.1.9.  
5.19.4   Test equipment  
     The test equipment should meet the related requirements of G B 16838.  
5.20   Fire sensitivity test  
5.20.1   Purpose  
     To inspect the response performance of the detector when subjected to test fire.  
5.20.2   Methods  
5.20.2.1   Point -type infrared flame detector  
5.20.2.1.1   Fix 4 samples in parallel direction a t a high place of 1.5m ± 0.1m, and 
separate them from fire. Connect to the control and indicating equipment, under 
normal surveillance mode.  
     Ignite the test fire. After a certain period of time, the radiation becomes stable.  
Remove the separating obj ect, and start timekeeping.  
     During the test, the distance between the samples and the centres of test fires 
are 12m, 17m and 25m respectively.  
5.20.2.1.2   Heptane fire  
a) Fuel:  Heptane (analytical pure / AP grade), plus toluene at volume fraction 3%; 
b) Weight:  650g;  
c) Layout:  Place the fuel in a container made of steel plates with a thickness 
2mm, base dimensions 33cm×33cm, and height 5cm;  
d) Ignition method: flame or electric spark.  
5.20.2.1.3   Ethanol open fire:  
a) Fuel: industrial ethanol (ab ove 90% of ethanol content, with small amount of 
methanol);  
b) Mass: 2000g;  
c) Layout: place the fuel in a container made of steel plates with a thickness of 
2mm, base dimensions 33cm×33cm, and height 5cm;  
d) Ignition way: flame or electric spark.  
5.20.2.2    Aspirated smoke detector  
5.20.2.2.1    Install two samples on the ceiling surface of the burning test room by 
the most unfavourable method according to the requirements set out in GB 4715. The 
samples are under normal surveillance mode according to the r equirements. For 
samples with adjustable response threshold values, the response threshold values 
should be preset at the maximum limit values.  
5.20.2.2.2    According to the requirements set out in GB 4715, place the sample in 
an area with clean air, and a llow it to operate stably for 30 minutes.  
5.20.2.2.3    Ignite each test fire according to the requirements set out in GB 4715. 
After ignition, the test staff should leave the test room immediately. Prevent airflow 
from influencing the test fire. All the do ors, windows or other openings should be 
closed. During the test period, the fire parameters, such as rT, m, y, etc., should be 
measured at all times.  
5.20.3   Requirements  
     Point -type infrared flame detectors should meet the requirements set out in 
Subsection 4.2.7. Aspirated smoke detectors should meet the requirements set out in 
Subsection 4.3.11.  
 
6   Inspection rules  
 
6.1   Pre -delivery inspection of products  
6.1.1    Pre -delivery inspection of point -type infrared flame detectors  
     Before the pro ducts are delivered from the factory, the enterprise concerned 
should inspect the detectors for the following test items:  
a) consistency test;  
b) bearing test;  c) repetitiveness test;  
d) low temperature (running) test.  
The manufacturer should specify the s ampling methods, inspection and 
determination rules.  
6.1.2   Pre-delivery inspection of aspirated smoke detectors  
     Before the products are delivered from the factory, enterprise concerned should 
inspect the detectors for the following test items:  
a) functional test of detect -alarm -type detector;  
b) repetitiveness test;  
c) consistency test;  
d) insulation resistance test;  
d) current leakage test.  
The manufacturer should specify the sampling methods, inspection and 
determination rules.  
6.1.3    Pre -delive ry inspection of image -type fire detectors  
     Before the products are delivered from the factory, the enterprise concerned 
should inspect the detectors for the following test items:  
a) response threshold value test;  
b) repetitiveness test;  
c) high temper ature test;  
d) environmental beam interference test.  
The manufacturer should specify the sampling methods, inspection and 
determination rules.  
6.1.4 Pre -delivery inspection of point -type carbon monoxide fire detectors  
     Before the products are delivered  from the factory, the enterprise concerned 
should inspect the detectors for the following test items:  
a) consistency test;  
b) repetitiveness test;  
c) collision test;  
d) low temperature (running) test;  
e) steady -state damp heat (running) test;  
f) power -source parameter fluctuation test.  
The manufacturer should specify the sampling methods, inspection and 
determination rules.  
6.2   Type inspection  
6.2.1    The type inspection items are the test items specified in Subsection 5 of this 
Standard. The inspection samples are selected from products that have passed the 
pre-delivery inspection.  6.2.2   Type inspection should be performed under one of the following 
circumstances:  
a) appraisal of sample of trial product when a new product is produced or an 
old product is produced in another factory;  
b) after official production, changes are made to the structure, main parts or 
components, production technology, etc. of the product that may influence the 
performance of the product; or after the product has officially bee n in production for 4 
years;  
c) a product resumes production after the termination of production for over 1 
year;  
d) the pre -delivery inspection results differ greatly to the previous type 
inspection results;  
e) a significant mass or quantity event occurs.  
6.2.3    The determination of the inspection results should be made according to the 
determination methods for type inspection results specified in GB12978.  
 
7   Markings  
 
7.1   General rules  
7.1.1   The markings on products should be clearly visible in th e installation and 
maintenance processes of the detector.  
7.1.2    The markings on products should not be attached to the screw or other parts 
that may be easily dismantled.  
7.2   Markings  
7.2.1    Product markings for point -type infrared flame detectors  
7.2.1.1   The following information should be clearly marked on each detector:  
a) Product name;  
b) Implementation standard;  
c) Name or trademark of manufacturer;  
d) Model number;  
e) Binding post indication;  
f) Manufacturing date, product code, country of orig in, and version number of 
the software inside the detector;  
g) Main technical parameters of the product (including the radiation spectrum 
range of the response flame of sample, sensitivity of sample).  
7.2.1.2    With regard to dismountable detectors, the co ntents of the markings on the 
sonde should include the content of the abovementioned items a), b), c), d), f) and g).  
The content of the markings of the base should include the content of items d) and e) as a minimum.  
7.2.1.3   If uncommon symbols or shor t-form terms are used in the product 
markings, a further explanation should be specified in the detector user manual.  
7.2.2    Product markings for aspirated smoke detectors  
Clear and durable product markings should be visible on each detector. The 
product markings should include the following:  
a) Name and address of manufacturer;  
b) Product name;  
c) Model number of product;  
d) Main technical parameters of product;  
e) Manufacturing date and product code;  
f) Implementation standard.  
7.2.3 Product markings for  image -type fire detectors  
7.2.3.1  The following information should be clearly marked on each detector:  
a) Name and model number of product;  
b) Name and address of manufacturer;  
c) Implementation standard;  
d) Binding post indication;  
e) Manufacturing date , product code, and version number of the software inside 
the sample;  
f) Main technical parameters of the product (including the smallest flame 
dimensions, angle of field of view).  
7.2.3.2  For dismountable detectors, the contents of the markings on the so nde should 
include the contents of the abovementioned items a), b), c), d), e) and f). The contents 
of the markings on the base should include the contents of item d) as a minimum.  
7.2.3.3    If uncommon symbols or short -form terms are used in the product 
markings, a detailed explanation should be specified in the related detector user 
manual.  
7.2.4    Markings of the products of point -type carbon monoxide fire detectors  
7.2.4.1   The following information should be marked on each detector:  
a) Name of product ; 
b) Model number;  
c) Name or trademark of manufacturer; Implementation standard;  
d) Standard number relating to this Part;  
e) Binding post indication;  
f) Manufacturing date, product code, country of origin and version number of 
the software inside the de tector;  
  For dismountable detectors, the contents of the markings on the sonde should include the abovementioned items a), b), c), d) and f). The contents of the markings 
on the base should include the contents of items b) and e) as a minimum  
7.2.4.2 If uncommon symbols or short -form terms are used in the product markings, a 
further explanation should be provided in the user manual together with the detector.  
7.3   Mass inspection marking  
     Each detector should obtain a passed mark of mass inspection.  Annex A  
(Normative Annex)   
Gas inspection devices  
 
A.1   Test equipment  
A.1.1    The layout of measurement zone, test instruments and detector is shown in 
Figure A.1:  
 
 
 
 
Remarks:  1 – Measurement working zone; 2 – Measurement platform; 3 – Detector;  
4 – Temperature sensor; 5 – Damping screen;  
6 – Connecting place of control and indicating equipment;  
7 – Connecting place of control and indicating equipment of gas inspection device;  
8 – airflow; 9 – gas sensor.  
Figure A.1   Layout diagram of detector a nd test instruments  
 
A.1.2    Gas inspection devices should guarantee that the measurement of the airflow 
velocity inside the working zone meets the test requirements of airflow velocity.  
A.1.3    Gas inspection devices should be able to measure the temperat ure rise to 55 
± 2oC inside the working zone at a temperature rise velocity of no greater than 
1oC/min.  
 Annex B  
(Normative Annex)   
Gas Sensors  
 
B.1.1   The measurement -use sensor attached to gas inspection device should be 
able to measure the concentrat ion of the gases of oxygen, carbon monoxide, methane, 
butane, heptane, ethyl acetate, isopropanol, carbon dioxide, hydrogen, nitrogen 
monoxide, etc.  
B.1.2   The measurement accuracy of the sensor should be 5ul/l as a minimum.  
 
 
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