COMMITTEE DRAFT STANDARD
 DUS  2141-
1:2019
First Edition
2019
Detonator — Specifications  — Part 1: Shock-tube Detonator
Reference number
                                    DUS 2141-1:2019
© UNBS 2019 DUS 2141-1:2019
Compliance with this standard does not, of itself confer immunity from legal obligations
A Uganda Standard does not purport to include all necessary provisions of a contract. Users are 
responsible for its correct application
© UNBS 2019 
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The Executive Director
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E-mail: info@unbs.go.ug
Web: www.unbs.go.ug
I © UNBS 2019 – All rights reserved                                                                                      DUS 2141-1:2019
Contents Page
Foreword........................................................................................................................................................... v
1Scope.................................................................................................................................................... 1
2Normative references .......................................................................................................................... 1
3Terms and definitions .......................................................................................................................... 1
4Classification........................................................................................................................................ 2
5Requirements....................................................................................................................................... 2
5.1General Requirements ......................................................................................................................... 2
5.2Specific Requirements ........................................................................................................................ 2
5.2.1Length of a shock-tube ........................................................................................................................ 2
5.1.2Shock resistance................................................................................................................................. 2
5.2.3Initiating power.................................................................................................................................... 2
5.2.4Water resistance.................................................................................................................................. 2
5.2.5Tensile strength.................................................................................................................................... 3
5.2.6Oil resistance....................................................................................................................................... 3
5.2.7Delay time............................................................................................................................................. 3
6 Packaging, labelling, transportation and storage ............................................................................ 4
6.2Packaging............................................................................................................................................. 4
6.3Transportation...................................................................................................................................... 4
6.1Labelling............................................................................................................................................... 5
6.4Storage.................................................................................................................................................. 5
7Sampling............................................................................................................................................... 5
7.1Batching regulation ............................................................................................................................. 5
Annex A (normative)  Method for Aluminium plate test of a commercial detonator ................................... 6
A.1Principle................................................................................................................................................ 6
A.2Apparatus............................................................................................................................................. 6
A.3Test Preparation................................................................................................................................... 7
A.3.2Commercial Plain Detonator ............................................................................................................... 8
A.3.3Shock Tube Detonator: ........................................................................................................................ 8
A.3.4Test Procedure..................................................................................................................................... 8
A.3.5Report................................................................................................................................................... 8
A.4Aluminium Plate................................................................................................................................... 9
A.5Precautions.......................................................................................................................................... 9
Annex A (normative)  Method for immersion test of a commercial detonator .......................................... 10
B.1Principle.............................................................................................................................................. 10
B.2Equipment.......................................................................................................................................... 10
B.2.1Water-Filled Container: ...................................................................................................................... 10
B.3Water Immersion Test Device ........................................................................................................... 10
B.4Test Conditions.................................................................................................................................. 11
B.5Test Procedure................................................................................................................................... 11
A.6Report Results................................................................................................................................... 12
A.7Precautions........................................................................................................................................ 12
A.1Visual inspection................................................................................................................................ 12
A.2Length of a shock-tube ...................................................................................................................... 12
A.3Shock resistance............................................................................................................................... 12
A.4Initiating power.................................................................................................................................. 12
A.5Water Resistance............................................................................................................................... 12
A.6Tensile strength.................................................................................................................................. 12
A.7Oil resistance..................................................................................................................................... 13
A.7.1Apparatus........................................................................................................................................... 13
A.7.1Test procedure................................................................................................................................... 13
A.8Delay time........................................................................................................................................... 13
© UNBS 2019 – All rights reserved IIDUS 2141-1:2019
A.2.1Test conditions are specified as follows .......................................................................................... 13
Annex A (normative)  Method for determination of delay time of a commercial detonator .....................14
A.2Apparatus........................................................................................................................................... 14
A.2.2Explosion Device............................................................................................................................... 14
A.2.3Sensor................................................................................................................................................. 14
A.3Operation Steps................................................................................................................................. 14
A.4Calculation and Processing of Results ............................................................................................ 15
A.4.1Processing of Outliers ....................................................................................................................... 15
A.5Precautions........................................................................................................................................ 15
Annex B (informative)  Supplementary rules for determination of delay time .......................................... 17
B.1Upper and lower limit of delay time .................................................................................................. 17
B.1.1Acceptance and rejection for the sample delay time ...................................................................... 17
B.1.2Misfire or incomplete explosion occurs during testing .................................................................. 18
B.2Upper and lower limit of delay time .................................................................................................. 18
B.2.1Judgment............................................................................................................................................ 18
B.2.2Disposal of extreme values ............................................................................................................... 18
Bibliography...................................................................................................................................................... 20
.
III © UNBS 2019 – All rights reserved                                                                                      DUS 2141-1:2019
Foreword
Uganda National Bureau of Standards (UNBS) is a parastatal under the Ministry of Trade, Industry and
Cooperatives established under Cap 327, of the Laws of Uganda, as amended.  UNBS is mandated to co-
ordinate the elaboration of standards and is 
(a)a member of International Organisation for Standardisation (ISO) and 
(b)a contact point for the WHO/FAO Codex Alimentarius Commission on Food Standards, and 
(c)the National Enquiry Point on TBT Agreement of the World Trade Organisation (WTO).
The work of preparing Uganda Standards is carried out through Technical Committees. A Technical Committee
is established to deliberate on standards in a given field or area and consists of key stakeholders including
government, academia, consumer groups, private sector and other interested parties. 
Draft Uganda Standards adopted by the Technical Committee are widely circulated to stakeholders and the
general public for comments. The committee reviews the comments before recommending the draft standards
for approval and declaration as Uganda Standards by the National Standards Council.
The committee responsible for this document is Technical Committee UNBS/TC ###,  [name of committee] ,
Subcommittee SC ##, [name of subcommittee] .
This second/third/… edition cancels and replaces the first/second/… edition (US nnn-n:yyyy), which has been
technically revised. 
US nnn consists of the following parts, under the general title Introductory element — Main element : 
 Part n: Part title 
 Part [n+1]: Part title 
 Part [n+2]: Part title
.
© UNBS 2019 – All rights reserved IVDUS 2141-1:2019
Introduction
Initiator is a term used in the explosive industry to describe any device that may be used to start a detonation
or a deflagration. There are four general classifications of initiators currently being used in blasting:
•Non-electric systems,
•Electric systems,
•Electronic systems, and
•Blasting-cap and safety-fuse systems.
Detonators are devices used to initiate high explosives.
A detonator is a complete explosive initiation device that includes the active part of the assembly (usually
enclosed in a metal shell) and the attached initiation signal transmitter (for example, leg wires, a shock tube,
or other signal-transmitting material).
A shock tube detonator is a non-electric explosive fuse or initiator in the form of small-diameter hollow plastic
tubing used to transport an initiating signal to an explosive charge by means of a percussive wave traveling
the length of the tube
Once  it  is  initiated,  the  shock  tube  transfers  a  signal  to  a  detonating  output  charge,  characteristically
incorporating an instantaneous output or a pre-determined delay.
V © UNBS 2019 – All rights reservedDRAFT UGANDA STANDARD                     DUS 2141-1:2019
 
Detonator  — Specifications  — Part  1: Shock-tube Detonator
1Scope
This draft Uganda standard specifies requirements, sampling and test methods for permitted shock-tube
detonators for commercial use.
The draft Uganda standard applies to shock-tube detonator No. 6 (surface) and No.8 (In-hole) for commercial
use.
2Normative references 
The following referenced documents referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
US EAS 124:1999, Rounding off number values  
ISO 7010:2011, Graphical symbols -- Safety colours and safety signs -- Registered safety signs
3Terms and definitions  
ISO and IEC maintain terminological databases for use in standardization at the following addresses: 
— ISO Online browsing platform: available at http://www.iso.org/obp
3.1
Permitted Detonators
detonator which is authorized by the competent authority for manufacture and commercial use
3.2
regulations
regulations promulgated under the relevant national legislation
3.3
Detonator
is device used to initiate high explosives
3.4
Shock tube 
is a non-electric explosive fuse or initiator in the form of small-diameter hollow plastic tubing used to transport
an initiating signal to an explosive charge by means of a percussive wave traveling the length of the tube
3.5
delay time of a commercial detonator
is the time it takes from in-putting excitation energy to the detonator to beginning to detonate
© UNBS  2019  – All rights reserved 1DRAFT UGANDA STANDARD                     DUS 2141-1:2019
 
4Classification
A shock tube detonator comprises of mainly a Shock-tube and Detonator(s)
Shock-tube shall be classified by strength (plain or heavy-duty)
Detonator shall be classified by delay time (millisecond, quarter second, half-second and second)
The detonators shall be of two types, namely; No. 6 (surface) and No.8 (In-hole)
5Requirements
5.1 General Requirements
The detonator shall be marked with a visible and distinguishable delay period number.
The surface of a plain detonator shall be free from obvious dust powder, rusty stains, major sand-holes,
cracks and mechanical injuries. The shock-tube shall be free from breaks, break-off of powder lining, thinning
off, water intrusion, foreign matters, poorly plasticized tube wall and un-tight sealing of tube end.
The shock-tube and detonator joint shall hold firmly and shall not become separated or loose.
5.2 Specific Requirements
5.2.1 Length of a shock-tube
The basic length of a shock-tube is 3(0/-0.1) m or as specified by the purchase contract. Measure with a ruler
that can give an accuracy of not less than 0.01m.
5.1.2 Shock resistance
Put samples into a wooden box at the center of its bottom, fill the gaps around the samples in the box, jolt for
a duration of 10 minutes with a frequency of 60 times/min. and a drop height of 150+2mm, then check to see if
any detonators explode or the structure of any detonators become loose or damaged.
5.2.3 Initiating power
The explosion of a shock-tube detonator No.6 shall break through 4mm thick aluminium-plate, while the
explosion of a shock-tube detonator No. 8 shall break through 5mm thick aluminium -plate. The hole broken
through the aluminium -plate shall not be less than the outside diameter of the detonator when tested in
accordance to annex A
5.2.4 Water resistance
5.2.4.1 Immerse a plain shock-tube detonator 1m deep into water for 8 hours, then make firing test for
determination of delay time, the detonator shall not misfire or incompletely explode.
5.2.4.2 Immerse a water-resistant shock-tube detonator 20m deep into water or into a water container, which
can produce 20m deep-water pressure, for 24 hours, then make firing test for determination of delay time, the
detonator shall not misfire or incompletely explode in accordance to annex B
© UNBS  2019  – All rights reserved 2                                                                                       DUS 2141-1:2019
5.2.5Tensile strength
5.2.5.1 For a plain shock-tube detonator, pull the shock-tube with a static force of 19.6N for one minute; it shall
not come off the rubber sleeve/plug.
5.2.5.2 For a heavy-duty shock-tube detonator, pull the shock-tube with a static force of 78.4N for one minute;
it shall not come off the rubber sleeve/plug.
5.2.6Oil resistance
Immerse heavy-duty shock-tube detonators into diesel oil with a temperature of 75±5 ℃ and a pressure of
0.3±0.02Mpa for 24 hours, then take them out for functioning reliability test, the detonators shall not misfire or
incompletely explode.
5.2.7Delay time
5.2.7.1 Time measuring instrument shall meet the following requirements:
a)For millisecond shock-tube detonators, it shall give an accuracy of not less than 0.1ms;
b)For half second or quarter second shock-tube detonators, it shall give an accuracy of not less, than
1ms;
c)For second shock-tube detonators, it shall give an accuracy of not less than 10ms.
5.2.7.2 Test conditions are specified as follows
a)The initiating end should be 1.0m~1.8m away from the target;
b)The time should be measured at the temperature range of 15 ℃~30℃;
c)For shock-tubes of products with a length of over 3 meters, cut to 3 meters for measuring the time or
take the actual length for the same purpose. For shock-tubes of products with a length of less than 3
meters, take their actual length for measuring the time.
d)Test procedure is as specified in Annex C
e)Supplementary rules for determination of delay time, please refer to Annex D.
5.2.7.3  The  delay  time  for  the  shock-tube  detonators  of  different  delay  periods  shall  conform  to  the
requirements specified in Table 1 and the detonators of additional delay trains can also be produced based
upon the actual needs and shall not exceed 10000 ms
Table 1 — Delay Time for Shock-tube Detonators of Different Delay Periods
Period
No.Delay Time in (nominal second)
MS shock-tube detonator in ms QS shock-
tube 
detonator in
sHS shock-tube
detonator in sS shock-tube detonator
in s
1st. ser 2nd ser 3rd ser 1st ser 1st ser 2nd ser 1st ser 2nd ser
1 0 0 0 0 0 0 0 0
2 25 25 25 0.25 0.50 0.50 2.5 1.0
3 50 50 50 0.50 1.00 1.00 4.0 2.0
© UNBS 2019  – All rights reserved 3DUS 2141-1:2019
4 75 75 75 0.75 1.50 1.50 6.0 3.0
5 110 100 100 1.00 2.00 2.00 8.0 4.0
6 150 125 125 1.25 2.50 2.50 10.0 5.0
7 200 150 150 1.50 3.00 3.00 _ 6.0
8 250 175 175 1.75 3.60 3.50 _ 7.0
9 310 200 200 2.00 4.50 4.00 _ 8.0
10 380 225 225 2.25 5.50 4.50 _ 9.0
11 460 250 250 _ _ _ _ _
12 550 275 275 _ _ _ _ _
13 650 300 300 _ _ _ _ _
14 760 325 325 _ _ _ _ _
15 880 350 350 _ _ _ _ _
16 1020 375 400 _ _ _ _ _
17 1200 400 450 _ _ _ _ _
18 1400 425 500 _ _ _ _ _
19 1700 450 550 _ _ _ _ _
20 2000 475 600 _ _ _ _ _
21 _ 500 650 _ _ _ _ _
22 _ _ 700 _ _ _ _ _
23 _ _ 750 _ _ _ _ _
24 _ _ 800 _ _ _ _ _
25 _ _ 850 _ _ _ _ _
26 _ _ 950 _ _ _ _ _
27 _ _ 1050 _ _ _ _ _
28 _ _ 1150 _ _ _ _ _
29 _ _ 1250 _ _ _ _ _
30 _ _ 1350 _ _ _ _ _
4 © UNBS 2019  – All rights reserved                                                                                       DUS 2141-1:2019
6 Packaging, labelling, transportation and storage
6.2Packaging
6.2.1The detonators shall be packaged as agreed to between the purchaser and the supplier and the
packaging material shall not compromise the performance of the product.
6.2.1Each packaging box shall be accompanied by an operation manual.
6.2.1Each packaging box and/or a batch shall be accompanied by a Material Safety Data sheet 
6.3Transportation
The transportation of shock-tube detonators shall conform to the requirements concerning transportation of
dangerous goods specified by the State.
6.1Labelling
 Each shock-tube detonator shall be clearly marked with visible and distinguishable delay time code. The
delay time codes for millisecond, quarter second, half second and second delay are respectively MS, QS, HS
and S. The marking on the outside packaging box of shock-tube detonators shall at least contain the following
items: 
a)The name and physical address of the manufacturer.
b)The name, grade, strength and type shock-tube (No.6 or No.8) of the product; 
c)The serial number of the production license;
d)“Explosive” marking conforming to ISO 7010;
e)Words such as “Handle with care”, “Inflammable”, “Keep dry”; 
f)Batch number;
g)Quantity;
h)Manufacturing date;
i)Expiry date
6.4Storage
The shock-tube detonators shall be in the original packing and kept in dry and well-ventilated storehouse at
room temperature. The service life is two years from the manufacturing date.
7Sampling
7.1Batching regulation
The batch submitted for inspection and test shall consist of the products, which are of similar structure, made
of similar materials and by similar process and equipment. The batch shall not exceed 35,000 pieces in size.
© UNBS 2019 – All rights reserved 5DUS 2141-1:2019
Detonators of same grade, same type and belonging to the same batch of manufacture shall be grouped
together to constitute a lot. 
Detonators constituting the sample shall be drawn from each lot separately for deciding the conformity of the
lot to the requirements of the specification
If the samples conform to the requirements as specified in clause 5 when subjected to all inspection items, the
batch of products represented by the samples should be accepted otherwise it should be rejected.
6 © UNBS 2019 – All rights reserved                                                                                       DUS 2141-1:2019
Annex A
(normative)
Method for aluminium plate test of a commercial detonator
A.1Principle 
Under  the  specified  test  conditions,  the  detonator is  erected  at  the  center of the  Aluminium plate  and
detonated. The diameter of hole perforated in the Aluminium plate indicates the strength.
A.2Apparatus
a.Detonator Resistance Checking Instrument: The maximum working current is not more than 30mA;
b.Vernier Caliper: graduation value 0.02mm;
c.Hole Sample Column: mm, 
 mm is the basic size of the outer diameter of the detonator;
d.Explosion Device: It should be able to ensure that the detonator is standing upright in the center of the
aluminium plate, and the hole diameter of aluminium plate support base is 20-25mm. There is an
explosion-proof and safety protection device, which is convenient and safe to use, and its device is as
shown as follows;
e.Fuse Cutter;
f.Crimping Machine;
g.Initiating Device: The output energy should meet the test requirements;
h.Aluminium Plate: 
i.Safety Fuse: 
© UNBS 2019 – All rights reserved 7DUS 2141-1:2019
Explosion Device Schematic
1.Safety Fuse; 
2.Detonator Tube; 
3.Aluminium Plate; 
4.Aluminium Plate Support Base; 
5.Explosion Box
A.3Test Preparation
A.3.1Take out a certain number of qualified aluminium plates for the test, and the quantity should be in
accordance with the corresponding product standards.
8 © UNBS 2019 – All rights reserved                                                                                       DUS 2141-1:2019
A.3.2Commercial plain detonator
Cut the safety fuse with a length of 70-100mm with a flat end face, put the inspected detonator into the hole of
the crimping machine one by one, insert the safety fuse and put it in place, and crimp it.
A.3.3Shock tube detonator: 
Only qualified samples after the visual inspection can be used for test.
A.3.4Test procedure
Place the aluminium plate horizontally in the explosion device, erect the test sample at the center of the
aluminium plate, and the bottom of the sample must be close to the aluminium plate.
A.3.4.1Initiate Detonator
a.Commercial Plain Detonator : Ignite the safety fuse and initiate the detonator;
b.Shock Tube Detonator : Initiate the sample with an explosion device.
A.3.4.2After the explosion of the detonator, inspect the aluminium plates in the explosion device one by one,
and record the number of non-fire and incomplete detonation (semi-explosion).
A.3.4.4Check the hole diameter of the aluminium plate one by one with the hole sample column and record.
If the diameter value of the hole is needed, measure one by one with a calliper; record the diameter value of
the  aluminium plate  hole.  Each  aluminium plate  is  measured  twice  at  the intersection  of  90º,  and  the
arithmetic mean of the two measurement results is taken as the measurement hole diameter of the perforation
of the aluminium plate. The hole sample column can also be used for the 4  measuring. The Vernier calliper is
used for checking.
A.3.5Report
A.3.5.1Evaluate the results according to the requirements of this standard.
A.3.5.2Report the arithmetic mean, maximum and minimum values of the perforation hole diameter of the
aluminium plate in each set of tests in mm, and keep a single digit after the decimal point.
Calculate the arithmetic mean according to equation (1):
n
idind1……………………………… . (i)
Where: d- in each set of tests, the arithmetic mean of the hole diameter of the aluminium plate perforation
measurement, mm;
N—the number of perforations of aluminium plates in each set of tests;
I— the series number of aluminium plate perforation aperture in each set of tests;
di— the ith aluminium plate perforation measurement hole diameter, mm.
A.3.5.3 After calculation according to formula (2), report the standard deviation of a set of test aluminium
plate perforation measurement hole diameter:
© UNBS 2019 – All rights reserved 9DUS 2141-1:2019
12)(
1


nddin
i
Where:  standard deviation of aluminium plate perforation hole diameter, mm.
A.4Aluminium plate
A.4.2The aluminium plate is made from the calendered sheet and allowed to be cast.
A.4.3The diameter and thickness of the aluminium plates should comply with the following table:
                                                                                                    Mm
No. Diameter Thickness
Basic size limit deviation
1 30-40 4.0 0.1
2 5.o5
Note: The thickness deviation within 5mm from the edge may not be within the specified deviation.
A.4.4 Aluminium plates must be flat, corrosion, cracks, delamination, inclusions, or shape defects that affect
the explosion are not allowed. It is allowed to have mechanical flaws such as depressions and scratches
within the limit deviation of the thickness of the aluminium plate.
A.4.5 Aluminium plates melted from the same furnace form one or more batches.
A.4.6 Take 5% aluminium plates from each batch to be examined for appearance and thickness (diameter is
guaranteed by tooling). It shall comply with the requirements of 4.3 and 4.4. If one item fails, the double
inspection shall be repeated and no more fails, otherwise, the batch shall be returned.
A.4.7 Aluminium plates that have been tested or rejected are allowed to be re-melted, but the aluminium
content must not be lower than 99.5%.
A.5 Precautions
A.5.1 The initiating operation shall comply with the relevant technical safety regulations;
A.5.2 Inspection of the detonator before the test and the crimping of the safety fuse and the plain detonator
shall be carried out in the explosion-proof enclosure;
A.5.3 After detonation, it should stay for a certain period of time before entering the test site. The detonator
failed in explosion should be disposed in accordance with relevant safety regulations.
10 © UNBS 2019  – All rights reserved                                                                                       DUS 2141-1:2019
Annex B
(normative)
Method for immersion test of a  commercial detonator
B.1Principle
Immerse the commercial detonator in a water-filled container that can simulate a certain water depth, endure
for  a  specified  water  immersion  time  at  certain  temperature,  take  out  the  commercial  detonator  for
performance test to determine the water resistance of the commercial detonator.
B.2Equipment
B.2.1Water-Filled Container:
a.Cylindrical pressure-resistant container with a diameter of 500mm and an effective net height of
1000mm, whose bottom has a porous partition. Other suitable pressure vessel is also allowed to be
used;
b.Pressure resistance should meet the test requirements, and equipped with drainage and safety valve
devices.
B.2.2Sample Cage: A device for placing the commercial detonator under test.
B.2.3Pressure test pump: It should meet the test requirements. Other devices capable of maintaining a
certain water pressure are also allowed.
B.2.4Pressure Gauge: It is not less than level 1.5, and the test pressure value should be within 1/4 to 3/4 of
the full scale value of the pressure gauge.
B.2.5Thermometer: 0-100 ℃, the division value is 1 ℃.
B.3Water Immersion Test Device
The water immersion test device is shown in the figure.
© UNBS 2019 – All rights reserved 11DUS 2141-1:2019
Schematic diagram of detonator immersion test device
1.Safety Valve;
2.Pressure Gauge; 
3.Water-Filled Container; 
4.Sample Cage; 
5.Drainage Device; 
6.Porous Partition; 
7.Pressure Test Pump
B.4Test Conditions
B.4.1Ambient temperature 5-35 ℃.
B.4.2The pressure fluctuation range is not more than 5% of the test pressure.
B.5Test Procedure
B.5.1Fill  the  water  container  with  fresh  water  and  adjust  the  water  temperature  to  meet  the  test
requirements.
B.5.2Check the sealing of the water container.
B.5.3Take a certain number of commercial detonators into the sample cage, hang the sample cage on the
porous partition in the water-filled container, close the flange cover, and seal tightly.
B.5.4Gradually  apply water pressure to the water-filled container with the pressure test pump to the
specified pressure value, and start timing. 
B.5.5After the test is completed, open the pressure relief valve of the pressure test pump and take out the
commercial detonator to dry the water.
12 © UNBS 2019 – All rights reserved                                                                                       DUS 2141-1:2019
B.6Report Results
Carry out the commercial detonator performance test according to the corresponding product standard, and
report the test results.
B.7Precautions
B.7.1Commercial detonators shall be placed in the bottom of the sample cage at a height not exceeding
100mm.
B.7.2When wiping the commercial detonator, the cotton fabric must be used behind the guard to dry the
water gently.
A.1Visual inspection
. Check with naked eyes.
A.7Oil resistance
A.7.1Apparatus
a) Container, which can be used for increasing temperature and pressure and is φ400mm×500mm in size; 
b) Diesel oil 
A.7.1Test procedure
Put diesel oil not less than 300mm deep into a container, heat the container until the oil temperature reaches
75±5℃, then immerse the samples in the oil and lid the container.
Pressure the diesel oil in the container to 0.3±0.02Mpa, then stop heating and maintain the diesel oil at that
pressure and cool in the air for 24 hours, then make functioning reliability test.
Observe the post-test phenomena and record the test results.
A.8Delay time
© UNBS 2019 – All rights reserved 13DUS 2141-1:2019
Annex C
(normative)
Method for determination of delay time of a commercial detonator
C.1Principle 
The delay time determination is based on the principle of time interval determination, that is, the time between
the beginning voltage pulse signal and the cut off voltage pulse signal is measured.
C.2Apparatus
C.2.1Instrument
The  time  measuring  instrument  shall  have  a  DC  constant  current  output  power  supply, a  timing  and
electronically controlled switching device, an optoelectronic and piezoelectric signal receiving circuit.
a)Output Power Supply: The current is continuously adjustable within 0-2A, the load resistance varies
within 1-10Ω, and the relative error of the output current is not more than 5%;
b)Ammeter: range 0-2A, accuracy level 1.0;
c)Timer: It should meet the product timing accuracy requirements.
C.2.2Explosion Device
The piezoelectric sensor is mounted on the outside of the explosion chamber. The distance between the
tested detonator and the sensor is not more than 0.5m.
C.2.3Sensor
a.Photoelectric sensor: The response time of the photocell is not more than 10 -7s;
b.Piezoelectric sensor, piezoelectric crystal or piezoelectric ceramic component.
C.3Operation Steps
C.3.1Sample Preparation
Only the qualified samples in the appearance and resistance inspection can be used for the test.
C.3.2Debug the instrument and check the explosion device. T urn on the instrument power,
preheat, debug, and then check the device.
Shock Tube Detonator Time Determination: Initiate a shock tube, and start the digital tube counting. Then,
make a vibration to the hammer box with a hammer, and the digital tube stops counting. The device is good.
C.3.3Time Determination
14 © UNBS 2019 – All rights reserved                                                                                       DUS 2141-1:2019
According to the delay time of the detonator to be tested and the accuracy of the time determination, select
and turn on the time base switch, and then place the detonator in the explosion box.
C.3.3.1Shock Tube Detonator: Fix the shock tube and fix it on the photoelectric sensor socket, keep the
distance between the photocell and the detonating end not more than 1m, then press the reset button to
initiate the shock tube with a spark actuator (or other excitation device). After the detonator explodes, record
the time value displayed by the digital tube.
C.4Calculation and Processing of Results
Calculating the mean and standard deviation
Where: - the mean sample delay time, ms or s;
Xi— the delay time of the i th sample, ms or s;
n— the number of detonators tested;
S—standard deviation of sample delay time.
The number of significant digits of the calculation result is selected according to the corresponding product
standard.
C.4.1Processing of Outliers
Outliers is allowed not to be used in the calculations of mean and standard deviation. The abnormal value of
the delay time shall be regarded as a defect when it is impossible to determine the technical failure of the test
system. If it can be confirmed that the abnormal value is caused by the technical failure of the determination
system, it shall not be regarded as a unaccepted product, and the delay time shall be re-determined after
supplementing the sample size.
C.5Precautions
C.5.1In the test, if  the  detonator does not  explode  within  the specified  delay time, must  cut  off the
detonation power supply at first, stay for a certain period of time before removing the detonator from the
explosion chamber.
C.5.2If a fault occurs during the test, disconnect the detonator wire connected to the current output of the
instrument at first before eliminating the fault.
C.5.3The terminal block for current and sensor must be secure and in good contact.
© UNBS 2019 – All rights reserved 15DUS 2141-1:2019
Annex D
(informative)
Supplementary rules for determination of delay time
D.1Upper and lower limit of delay time
The upper limit (U) of a shock-tube detonator delay time is the mid-point of said delay period and its previous
delay period while the lower limit (L) is the mid-point of said delay period and its subsequent delay period.
When an instantaneous shock-tube detonator is used together with shock-tube detonators for arranging delay
periods, the lower limit of said detonator delay period should be zero. The upper limit of the last shock-tube
detonator delay period can be calculated by adding the previous delay period to the difference between the
last delay period and its lower limit.
Example:
First delay period of HS detonator: L=0; U= (0+0.50)/2=0.25.
Tenth delay period of HS detonator: L= (4.00+4.50)/2=4.25; 
     U= (4.50-4.25) +4.50=4.75
D.1.1Acceptance and rejection for the sample delay time
A.2.1 After testing for determination of delay time, use formulas (A.1) and (A.2) to calculate the values of
abscissa (x) and ordinate (y) of the acceptance curve as shown in Fig. A. 1.
LUSx………………………………… . (A. 1)
LULXy………………………………… . (A. 2)
Where:
S—— Standard deviation value of the sample delay time in second or millisecond; 
U—— Upper limit of the sample delay time in second or in millisecond;
L—— Lower limit of the sample delay time in second or in millisecond;
X—— Average value of the sample delay time in second or in millisecond.
When recorded and calculated, the effective digits for the delay time and its average value, and standard
deviation value should be same as those given in Table 1. For calculating values of abscissa and ordinate (x,
y), three effective digits should remain, the subsequent digit should be rounded off in accordance with the
requirements specified in US EAS 124. 
A.2.2 Place a point (x, y) on a corresponding acceptance curve. If the point falls within the 
acceptance curve (or on the curve), the tested sample will be considered satisfactory; otherwise it should be
considered unsatisfactory  
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B.1.2Misfire or incomplete explosion occurs during testing
During testing for determination of delay time, if one shock-tube detonator misfires or incompletely explodes
not because of water intrusion, record the misfired detonator for investigation, then take one round at random
for retest from samples satisfactorily passing the visual check, and use newly determined value of re-tested
detonator and other values of tested detonators for calculation. If two or more than two shock-tube detonators
misfire or incompletely explode not because of water intrusion, the delay time of the batch represented by the
samples should be directly considered unsatisfactory, no retest will be made.  
B.2Upper and lower limit of delay time
B.2.1Judgment
During testing for determination of delay time, if one extreme value occurs, accept or reject it or calculate
statistical values (nG ) and ('nG ) of the maximum and minimum values of the sample delay time by using
formulas (A.3) and (A.4)
)(1maxXXSGn
………………………………… . (A. 3)
)(1min'XXSGn
    ………………………………… . (A. 4)
Where:
 S   —— Standard deviation value of the sample delay time in second or in millisecond;
X    —— Average value of the sample delay time in second or in millisecond;
maxX  —— Maximum value of the sample delay time in second or in millisecond;
minX  —— Minimum value of the sample delay time in second or in millisecond.
If nG  or 'nG  is more than critical value, the extreme value is considered abnormal and rejected, otherwise
it is considered normal and no value is rejected.
 Example:
At an inspection level value of l5%, find that the critical value is 95.0G  (20) 
=2.557 (n=20). If  20G or '20G  is more than 2.557, the extreme value is considered abnormal and rejected,
otherwise it is considered normal and no value is rejected.  
B.2.2Disposal of extreme values
During testing if one extreme value occurs and is considered abnormal, reject the value and record it for
investigation, then take one shock-tube detonator at random for retest from samples satisfactorily passing the
static pull test to obtain a new value. During testing if two or more than two extreme values occur or after
retest extreme value still occurs, no judgment will be made and the calculation will be made directly by using
the values obtained.
© UNBS 2019 – All rights reserved 17DUS 2141-1:2019
    
Fig.A.1    Delay Time Acceptance Curve
(The batch size is 3,201 pieces ~ 10,000 pieces.)
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Reduced                                                                                       DUS 2141-1:2019
Bibliography
[1]GB 19417: 2003, Shock-tube Detonator
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Products that conform to Uganda standards may be marked with Uganda National Bureau of Standards
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The use of the UNBS Certification Mark is governed by the Standards Act, and the Regulations made
thereunder. This mark can be used only by those licensed under the certification mark scheme operated by
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Further particulars of the terms and conditions of licensing may be obtained from the Director, Uganda
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