PT2E-2721

Smart Transmitter/Gas Detector Head

SD-1DEC<ITRI Specifications>Operating Manual(PT2E-178)(PT2-178)

Operating Precautions
This detector is a gas detector that detects toxic gases in the air and triggers a gas alarm.
The gas detector is a safety unit, not an analyzer or densitometer which performs quantitative/qualitative
analysis/measurement for gases.
Please fully understand the following points before using it, so that it can be used properly.
1. The detector may be interfered by gases other than the gas to be detected, solvents, vapors etc.
Please note that the alarm may be triggered by interference. In addition, it may be fluctuated byenvironmental (temperature, humidity etc.) changes in the installation site.
2. The alarm must be set within a range where the performance of the detector can be ensured.
In facilities compliant with the High Pressure Gas Safety Act, an alarm setting below our standard alarm
setpoint (threshold limit value) may trigger a false alarm.
3. This is a safety unit, not a control unit.
The alarm contact output of the detector must be used for an external alarm lamp/buzzer, while theanalog signal output must be used for an indicator or external recorder.
4. Because the contact point of the gas detector sensor is made of porous polymeric membrane, the water
repellency of the membrane is deteriorated by solvents, thus causing an electrolyte leak from its inside.
Do not use solvents near the detector. If a solvent is used for unavoidable reasons, attach therecommended filter to the inlet of the gas detector while using the solvent and for one hour after that.
5. For maintenance of the detector, it must go through a regular maintenance, including replacement andadjustment of the regular replacement parts as specified in the operating manual. In addition, because
this is a safety unit, it is recommended that a regular maintenance and a calibration are performed every
six months in accordance with the regulations.

<Contents>
1 Outline of the Product ............................................................................................................ 2
1-1. Preface .............................................................................................................................. 2
1-2. Purpose of use .................................................................................................................. 2
1-3. Definition of DANGER, WARNING, CAUTION and NOTE ................................................ 2
1-4. Method of confirmation for Standards and Explosion proof specification .......................... 3
2 Important Notices on Safety .................................................................................................. 4
2-1. Danger cases .................................................................................................................... 4
2-2. Warning cases .................................................................................................................. 5
2-3. Precautions ....................................................................................................................... 6
2-4. Safety Information ............................................................................................................. 7
3 Product Components ............................................................................................................. 8
3-1. Main unit and standard accessories .................................................................................. 8
3-2. Names and functions for each part ................................................................................... 9
3-3. Block diagram ................................................................................................................... 10
4 How to Use ............................................................................................................................ 11
4-1. Before using the detector .................................................................................................. 11
4-2. Precautions for installation points...................................................................................... 11
4-3. Precautions for system designing ..................................................................................... 12
4-4. How to install ..................................................................................................................... 14
4-5. Installation procedure ........................................................................................................ 16
4-6. How to wire ....................................................................................................................... 18
4-7. How to tube ....................................................................................................................... 22
5 How to Operate ..................................................................................................................... 23
5-1. Preparation for start-up ..................................................................................................... 23
5-2. Basic operating procedures............................................................................................... 23
5-3. How to start the detector ................................................................................................... 24
5-4. Modes ............................................................................................................................... 25
5-5. Maintenance Mode(User) .................................................................................................. 26
5-6. How to exit ........................................................................................................................ 28
6 Operations and Functions ..................................................................................................... 29
6-1. Gas alarm activation ......................................................................................................... 29
6-2. Fault alarm activation ........................................................................................................ 30
6-3. External output operation .................................................................................................. 31
6-4. Other functions .................................................................................................................. 32
7 Maintenance .......................................................................................................................... 33
7-1. Maintenance intervals and items ....................................................................................... 33
7-2. Maintenance Mode(Regular maintenance) ....................................................................... 35
7-3. Gas Calibration method .................................................................................................... 42
7-4. Parts replacement ............................................................................................................. 45
8 Storage, Relocation and Disposal ......................................................................................... 47
8-1. Procedures to store the detector or leave it for a long time ............................................... 47
8-2. Procedures to relocate the detector or use it again ........................................................... 47
8-3. Disposal of products .......................................................................................................... 47
9 Troubleshooting ..................................................................................................................... 48
10 Product Specifications ......................................................................................................... 50
10-1. List of specifications ........................................................................................................ 50
10-2. Detection principle ........................................................................................................... 52
11 Definition of Terms ............................................................................................................... 53-1-

1 Outline of the Product1-1 .Preface

1

Outline of the Product1-1. Preface
Thank you for choosing our smart transmitter/gas detector head SD-1DEC. This manual is Industrial
Technology Research Institute specifications (hereinafter referred to as ITRI specifications). Please checkthat the model number of the product you purchased is included in the specifications on this manual.
This manual explains how to use the detector and its specifications. It contains information required forusing the gas detector properly. Not only the first-time users but also the users who have already used the
product must read and understand the operating manual to enhance the knowledge and experience before
using the detector.
Although the number of digits to display varies depending on the detection range, this manual provides
explanation using a detection range from 0 to 150ppm as examples (such as examples of LED display).

1-2. Purpose of use







This detector is a fixed type gas detector head that detects leak of toxic gases and performs the alarm
activation when the gas concentration is over the setting value.
The detector is a safety unit, not an analyzer or densitometer which performs quantitative/qualitative
analysis/measurement for gases. Please fully understand the features of the detector before using it,so that it can be used properly.
The detector detects abnormalities in the air caused by presence of gases or other reasons (leak) withthe built-in gas sensor. The concentrations of detected gases are displayed on the seven-segment
LED.
An external pump etc. outside the detector introduces gas to perform gas detection.
The detector has a built-in alarm contact and can be used either as a gas alarm, fault alarm or common(gas, fault) alarm.
The detector outputs gas concentration in 4 – 20 mA.

1-3. Definition of DANGER, WARNING, CAUTION andNOTE
DANGER

This message indicates that improper handling may cause serious damage on
life, health or assets.

WARNING

This message indicates that improper handling may cause serious damage on
health or assets.

CAUTION

This message indicates that improper handling may cause minor damage on
health or assets.

NOTE

This message indicates advice on handling.

-2-

1 Outline of the Product1-4 .Method of confirmation for Standards and Explosion proof specification

1-4. Method of confirmation for Standards andExplosion proof specification
This instrument has some specification depends on standard and explosion proof certificate. Pleaseconfirm the detector specification before using.

ITRI specifications name plate-3-3 Product Components

3-2. Names and functions for each part3-2. Names and functions for each part
(5) Power lamp

(6) Alarm lamp

(7) Fault lamp(1) MENU/ESC key(3) ▲ key(8) Concentration value display(2) SET key(1)

MENU/ESC key(2)

SET key

(3)
(4)

▲ key
▼ key

(5)

Power lamp

(6)

Alarm lamp

(7)

Fault lamp

(8)

Concentration value
display(4) ▼ key

Used to enter the maintenance mode.
It is also used to cancel in a specific mode.
It is used for value confirmation and so on in a specificmode.
Used to switch menus or change a value (UP).
Used to switch menus or change a value (DOWN).
Power lamp.
Detection mode: It lights up in green.
Maintenance mode: It blinks in green.
Alarm lamp. It lights up in red when the alarm setpoint value
is reached.
Fault lamp. It lights up in yellow when an abnormality isdetected in the detector.
Display the gas concentration and so on.

-9-4 How to Use

4-5. Installation procedure

NOTE
・Our company-specified grease : BARRIERTA JFE 552 (manufactured by NOK KLUBER)
If you can not prepare the specified grease, use one that meets the following requirements.
1. Material does not harden due to deterioration
2. Volatile solvent-free
3. Material does not cause corrosion at the surface
4. Silicon-free
5. Validation of suitability depends on the specifications of grease manufacturer- 17 -

6-1. Gas alarm activation

6 Operations and Functions

6

Operations and Functions
6-1. Gas alarm activation
Gas alarm: Activated when the concentration of detected gas reaches or exceeds the alarm setpoint value.
<<Auto-Reset Operation>>

NOTE
The alarm setpoint is factory-set. Although the alarm delay time (standard: 2 seconds) works in the detector
to prevent a false activation, it can be cancelled if not needed.

<Display Operation>
Gas Concentration Display
In case of over the detection range (Over Scale), "∩∩∩∩" is displayed on the LED.
Power Indicator Lamp (POWER: Green)
During operation, this lights up continuously.
Alarm Indicator Lamp (ALM: Red)This lights up when the alarm setpoint value is reached or exceeded.

<Contact Activation>
The contact is activated when the gas concentration reaches or exceeds the alarm setpoint value (onlywhen the alarm is used).
The contact activation is reset automatically when the gas concentration drops below the alarm setpointvalue.

Concentration

Alarm setpoint

0

Time

Alarm lamp (ALM)
Alarm contact (terminal plate 4, 5)

Alarm delay time (2 seconds)- 29 -

6 Operations and Functions

6-2. Fault alarm activation<Response to Gas Alarm>
A gas concentration value exceeds the alarm setpoint
When a gas alarm is triggered, take actions in accordance with your management rules of gas alarm.
Normally, take the following actions.


Check the reading of the detector.

NOTE
If a gas leak is momentary, the reading may already have dropped when checking it. In addition, when thealarm is triggered by noise or other incidental conditions other than a gas, the reading may have already
dropped.


Based on your management rules of gas alarm, no one can be allowed to access the monitored
zone to ensure safety.
If the gas concentration display continues to be displayed, close the main valve of the gas, and thencheck that the gas concentration reading dropped.
Access the gas leak point, equipped with a protective gear to avoid dangers caused by possibly
remaining gases, and check whether gases remain or not by using a portable gas detector.
Check that the point is free from dangers, and take actions to fix the gas leak.

6-2. Fault alarm activation
A fault alarm is triggered when the detector detects abnormalities. After a fault alarm is triggered, the fault
lamp (yellow) lights up and an error message is displayed on the LED. Determine the causes and takeappropriate actions.
After the detector is successfully returned from the fault, it restarts with the process normally performed rightafter it is turned on (initial clear).
If the detector has problems and is repeatedly malfunctioning, contact RIKEN KEIKI immediately.

<Display Operation>
Fault Detail Display
Display a message indicating the fault detail.
Fault Lamp (FAULT: Yellow)
This lights up when a failure occurs.

NOTE
For information on malfunctions (error messages), see "9. Troubleshooting".

- 30 -

7-1. Maintenance intervals and items

7 Maintenance

7

Maintenance
The gas detector is an important instrument for the purpose of safety.
To maintain the performance of the gas detector and improve the reliability of safety, perform a regular
maintenance.

7-1. Maintenance intervals and items

Daily maintenance: Perform maintenance before beginning to work.
Monthly maintenance: Perform maintenance on the alarm circuit (alarm test) once a month.
Regular maintenance: Perform maintenance once or more for every six months to maintain theperformance as a safety unit.
Maintenance
itemPower Supply
Check
Concentration
Display Check
Flow rate
check
Filter check
Alarm Test
Span
Adjustment
Gas Alarm
Check

Maintenance content
Check that the power lamp lights up.
Check that the concentration display value is zero. Whenthe reading is incorrect, perform the zero adjustment after
ensuring that no interference gases exist around it.
Check the flow rate to find abnormalities.
Check the dust filter for dust or clogging.
Inspect the alarm circuit by using the alarm test function.
Perform the span adjustment by using the calibration
gas.
Check the gas alarm by using the calibration gas.

Daily
maintenance

Monthly
maintenanceRegularmaintenance




















－







－

－



－

－



<About Maintenance Services>

We provide services on regular maintenance including span adjustment, other adjustments andmaintenance.
To make the calibration gas, dedicated tools, such as a gas cylinder of the specified concentrationand gas sampling bag must be used.
Our qualified service engineers have expertise and knowledge on the dedicated tools used forservices, along with other products. To maintain the safety operation of the detector, please use ourmaintenance service.
The followings are typical maintenance services. For more information, please contact RIKEN
KEIKI.

- 33 -

7 Maintenance7-1. Maintenance intervals and items

Main Services
Power Supply
Check

:

Concentration
Display Check:

Flow Rate
Check:

Filter Check:

Alarm Test:

Span
Adjustment
Gas Alarm
Check:Cleaning andRepair of
Device(VisualDiagnosis)
DeviceOperation
Check
Replacementof Consumable
Parts

:

:

Checks the power supply voltage.
Verifies that the power lamp lights up.
(Verifies that relevant points can be identified on the system.)(When a UPS (uninterruptible power system) is used, checks the operation with the UPS.)
Verifies that the concentration display value is zero (or 20.9 vol% on the oxygen deficiency
meter) by using the zero gas.
Performs the zero adjustment (fresh air adjustment) if the reading is incorrect.
Checks the flow rate indicator to find abnormalities.
Checks the flow rate by using an external flow meter to verify the correctness of the flowrate indicator on the gas detector. If the flow rate is incorrect, performs the flow rateadjustment.
Checks the dust filter for dust or clogging.
Replaces a dirty or clogged dust filter.
Inspects the alarm circuit by using the alarm test function.

Checks the alarm lamps. (Checks ALM1 activation.)
Checks the external alarm. (Checks the activation of the external alarm, such as abuzzer.)Performs the span adjustment by using the calibration gas.
Checks the gas alarm by using the calibration gas.
Checks the alarm. (Checks triggering of alarm when the alarm setpoint is reached.)

Checks the delay time. (Checks time to delay until the alarm is triggered.)
Checks the alarm lamps. (Checks ALM1 activation.)
Checks the external alarm. (Checks the activation of external alarms, such as abuzzer and reset signal.)
Checks dust or damage on surface, cover or internal parts of the detector, cleans andrepairs such parts of the detector.
Replaces parts which are cracked or damaged.

:

Uses the keys to check the operation of functions and parameters.

:

Replaces consumable parts, such as a sensor, filter and pump.

- 34 -

9 Troubleshooting

9

Troubleshooting
The Troubleshooting does not explain the causes of all the malfunctions which occur on the detector. This
simply helps to find the causes of malfunctions which frequently occur. If the detector shows a symptom
which is not explained in this manual, or still has malfunctions even though remedial actions are taken,
please contact our overseas sales department or local representatives.

<Abnormalities on Unit>
Symptom/Display

The power cannot
be turned on.

Abnormaloperations

Sensorabnormalities
E-1

Systemabnormalities
E-9

FAULT

―

―

●

Causes
The wiring is not correct.
The terminal plate isremoved.

Actions
Connect the wiring properly.
Connect the terminal plate properly.

Abnormalities/momentary
blackout of power supply
systemProvide the rated voltage.
Take measures such as checking or adding the
UPS, power supply line filter and insulationtransformer.

Cable abnormalities(open circuit/not
connected/short circuit)

Check the wiring of detector and related
devices around it.

Disturbances by sudden
surge noise, etc.

Turn off and restart the indicator/alarm unit.
If such a symptom is observed frequently, takeappropriate measures to eliminate the noise.

The sensor is notconnected or improperly
connected.
Zero drift caused byenvironmental changes
or aging deterioration isout of the range of zero
follower.
Faults of the sensor
The rated voltage is not
supplied to the detector.
Abnormalities of ROM,
RAM or EEPROM insideof the detector●
External output 4-20mA
is not properly outputted- 48 -

Check if the cable is securely fastened to theterminal plate.
Perform zero adjustment. If the symptom
persists after the zero adjustment, replace thesensor with a new one.
Replace the sensor with a new one.
Check the power supply, and supply the rated
voltage.
Please contact our overseas sales department
or local representatives.
Check if the cable for external output iscorrectly connected. (Deterioration of the cable,
connection of the host system, etc).
If the output is not necessary, connect a
resistance to the terminal as mentioned in P19.
If it is correctly connected, contact our overseas
sales department or local agents because afailure inside this detector might be occurred.

9 Troubleshooting<Abnormalities of Readings>
Symptoms

The reading rises (drops)
and it remains so.

CausesDrifting of sensor
outputPresence ofinterference gas
Slow leakEnvironmental
changes
Presence ofinterference gas

A gas alarm is triggered
despite of no gas leakand no otherabnormalities at thedetection point.

Slow response

Span adjustment
impossible

Actions
Perform zero adjustment.
Disturbances by interference gases, such as solvents,
cannot be eliminated completely.
A very small amount of the gas to be detected may beleaking (slow leak). Because ignoring it may cause
dangers, take a remedial measure, i.e., taking actions thesame as those for the gas alarm.
Perform the zero adjustment (AIR adjustment).

Disturbances by interference gases, such as solvents,
cannot be eliminated completely.
Turn off and restart the detector.
Disturbance by noise If such a symptom is observed frequently,
take appropriate measures to eliminate the noise.
When the environment (temperature etc.) changes
suddenly, the detector cannot adjust to it and is affectedby it.
Sudden change in
In some cases, the detector triggers an indication alarm.
the environment
Because the detector cannot be used under sudden andfrequent environmental changes, any preventive actions
to eliminate them should be taken by the user.
Clogged dust filter
Replace the dust filter.
Bended, clogged,or leaked suction
Fix the defective parts.
tube or exhausttube
Condensation isformed inside theFix the defective parts.
suction tube.
Deteriorated sensor
Replace the sensor with a new one.
sensitivity
Improper calibration
Use the proper calibration gas.
gas concentration
Deteriorated sensor
Replace the sensor with a new one.
sensitivity- 49 -

10 Product Specifications

10-1. List of specifications

10

Product Specifications
10-1. List of specifications<ITRI Specifications>
Model
Detection principle
Detection gas
Concentration display
Detection range
Resolution
Detection method
Suction flow
Alarm setpoint
Power display
External output
Alarm accuracy

SD-1DEC
Electrochemical method
H2S/CO
LED(4digits・7segments)
H2S：0 - 30ppm or 0 - 50ppm or 0 - 100ppm
CO：0 - 75ppm or 0 - 150ppm or 0 - 200ppm or 0 - 250ppm or 0 - 300ppm or
0 - 500ppm
Depend on detection range
Suction method(pour into by external unit)
1.5±0.1L/min
Depend on detection gas
POWER lamp lighting(green)
Gas concentration signal/Alarm contact(Gas alarm or fault alarm or gas/fault
common alarm)
Within ±30% to the alarm setpoint value(under an identical condition)

Alarm-delay time
(under an identical condition)

Gas alarm typeGas alarm display
Gas alarm patternFault alarm/Self diagnosis
Fault alarm display
Fault alarm pattern
Alarm contact
Contact capacity
Transmission scheme
Transmission specification
Transmission cable
Transmission distancePower supply
Power consumption
Cabling port
Piping port
Initial clear
Operating temperature range
Operating humidity range
Structure
Explosion protected
construction
Explosion-proof class
Dimensions
WeightColorWithin 30sec(when introducing 1.6 times thicker gas than alarm set point)(without
piping delay time)Single alarm(H)ALM lamp lighting(red)Auto-recover
System failure/Sensor failure
FAULT lamp lighting(yellow)/content display
Auto-recoverNo-voltage contact 1a･Non-exciting at normal(exciting at alarm) or exciting at
normal(non-exciting at alarm)
AC250V・0.5A/DC30V・0.5A(resistive load)
Three-wire analog transmission(in common with power supply<power, signal,common>)4 - 20mA DC (linear/load resistance under 300Ω)
CVVS1.25 mm2 or 2.0mm2 - 3-core (when the contact is not used)
CVVS1.25 mm2 or 2.0mm2 - 5-core (when the contact is used)
1.25km or less in case of CVVS 1.25mm2
2.0km or less in case of CVVS 2.0mm2
24 VDC±10%
MAX.1.1W
Pressure proof packing gland<G3/4>(Compatible cables φ9.6-13.0mm in outer
diameter) or Adapter A<NPT1/2> or Adapter B<NPT3/4>
Rc1/8(with PP elbow union for O.Dφ6-1t・PTFE pipe)
Approx.25sec-10 - +40℃(non-rapidly-vary)
30 - 80%RH(non-condensing)
Wall mounting type
Flame proof structure
Ex db ⅡC T6 Gb
Approx.148(W)×200(H)×88(D)mm(projection portions excluded)
Approx.2.6kg
Munsell 7.5BG5/2- 50 -

10 Product Specifications

10-1. List of specifications

Outline Drawings- 51 -

11 Definition of Terms

11

Definition of Terms
Electrochemical
type
Initial clear
Full scale
ppm
Calibration
Zero suppression
Alarm delay time
INHIBIT

This is a principle of the sensor installed in the detector head.
See "10-2. Detection principle" for details.
Output from the detector head fluctuates for a while after turning on the power.
This is a function to prevent triggering alarm during that time.
Maximum value of the detection range.
A concentration unit that means part per million of the combustible gas to be detected.
Adjusts the readings to the calibration gas concentration value by using the calibrationgas.
A function to cut off the specific drifting that the sensor has.
A function which temporarily suspends activation to prevent a false alarm caused bynoise from its outside.
The gas detection function is temporarily suspended during maintenance etc. of thedetector.
This is also called "point skip", which has the same function.

- 53 -

Manual Log
Rev.

Amendment

0First issue

1

P3 Name plate, P7 Certificate No., P14 Maintenance space,
P7,50 Explosion-proof class

Issue data
February,25,2019
March,2,2020