Riken Keiki GD-A80D-AS Series User manual

PT2E-1926
Fixed Combustible/
Toxic Gas Detector Head
GD-A80D-AS Series
GD-A80D-AS
GD-A80DV-AS
GD-A80DS-AS
GD-A80DN-AS
Operating Manual

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Operating Precautions
This detector is a gas detector that detects combustible gases or 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. This detector may be interfered by gases other than the gas to be detected and vapors.
Please note that the alarm may be triggered by interference. In addition, it may be fluctuated by
environmental (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 may trigger a false alarm.
3. This is a safety unit, not a control unit.
4. If silicon or sulfide compounds are accumulated on the surface of sintered alloy of the gas detector
sensor used for this unit, the area of the gas sensing part becomes smaller, which may result in serious
deterioration of its sensitivity.
For safety reasons, do not use the detector under the presence of silicon or sulfide compounds even
though their amount is very small.
5. For maintenance of the detector, it must go through a regular maintenance, including replacement and
adjustment 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.

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Contents
1. Outline of the Product..........................................................................................................................................4
1-1. Preface..........................................................................................................................................................4
1-2. Purpose of use ..............................................................................................................................................4
1-3. Definition of DANGER, WARNING, CAUTION and NOTE...........................................................................4
1-4. Method of confirmation for standards and explosion proof specification......................................................5
2. Important Notices on Safety ................................................................................................................................6
2-1. Danger cases ................................................................................................................................................6
2-2. Warning cases...............................................................................................................................................6
2-3. Precautions ...................................................................................................................................................7
2-4. Safety information .........................................................................................................................................8
3. Product Components.........................................................................................................................................10
3-1. Main unit and standard accessories ...........................................................................................................10
3-2. Names and functions for each part .............................................................................................................11
3-3. Block diagram .............................................................................................................................................12
4. How to Use ........................................................................................................................................................13
4-1. Before using the detector............................................................................................................................13
4-2. Precautions for installation sites .................................................................................................................13
4-3. Precautions for system designing ...............................................................................................................14
4-4. How to install...............................................................................................................................................15
4-5. Installation procedure..................................................................................................................................16
4-6. How to wire .................................................................................................................................................17
4-7. How to Tube ................................................................................................................................................21
5. How to Operate..................................................................................................................................................22
5-1. Preparation for start-up ...............................................................................................................................22
5-2. How to activate the detector .......................................................................................................................22
5-3. Flow Rate Adjustment .................................................................................................................................22
5-4. How to detect ..............................................................................................................................................23
5-5. How to exit ..................................................................................................................................................23
6. Maintenance ......................................................................................................................................................24
6-1. Maintenance intervals and items ................................................................................................................24
6-2. Calibration method......................................................................................................................................26
6-3. Replacement parts ......................................................................................................................................28
7. Storage, Relocation and Disposal .....................................................................................................................30
7-1. Procedures to store the detector or leave it for a long time........................................................................30
7-2. Procedures to relocate the detector or use it again ....................................................................................30
7-3. Disposal of products ...................................................................................................................................30
8. Troubleshooting .................................................................................................................................................31
9. Product Specifications .......................................................................................................................................32
9-1. Standard specifications...............................................................................................................................32
9-2. Detection principle.......................................................................................................................................34
10. Definition of Terms ...........................................................................................................................................37

1. Outline of the Product 1-1. Preface
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1
Outline of the Product
1-1. Preface
Thank you for choosing our fixed combustible/toxic gas detector head GD-A80D-AS Series. Please check that
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 for using
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.
Note that the detector cannot be used alone. Use it with the dedicated indicator/alarm unit. Be sure to read the
operating manual of the indicator/alarm unit as well.
1-2. Purpose of use
･This detector is a fixed type gas detector head which detects leak of combustible or toxic gases.
･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 caused by presence of gases (leak) with the built-in gas sensor.
･The detector draws a gas by an aspirator using compressed air to perform gas detection.
･Use the detector in combination with an indicator/alarm unit that indicates a gas concentration and triggers
an alarm.
･When the detector detects a leak of combustible or toxic gas, it outputs a voltage according to the gas
concentration. The indicator/alarm unit indicates the gas concentration and triggers an alarm if a preset
concentration level is exceeded.
1-3. Definition of DANGER, WARNING, CAUTION and
NOTE
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. Important Notices on Safety 2-4. Safety information
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2-4. Safety information
Observe the followings to maintain an explosion-proof system.
Outline of the unit
･This unit is a compressed air-driven aspirator suction type gas detector head (GD-A80D-AS Series) used in
connection with the indication alarm to detect target gas.
･This unit is designed to have a gas detector head (GD-A80D Series) incorporated in the sampling device.
<ATEX Specifications>
Technical Data
(Explosion-proof enclosures) Flame-proof enclosures "d"
(Group) II
(Category) 2G
(Explosion-proof class) Ex db IIC T4
(Protection level) Gb
(Ambient temperature)* -40ºC to +53ºC
(Rating)
･Detecting element GD-A80(D) DC3. 0V 430mA or DC5. 0V 200mA
GD-A80(D)V DC6. 5V 205mA or DC3. 5V 350mA
GD-A80(D)S DC3. 0V 500mA or DC5. 0V 200mA
GD-A80(D)N DC3. 3V 170mA or DC1. 0V 220mA
(Applicable Standard) EN 60079-0 (2018), EN 60079-1 (2014)
IEC60079-0 (2017), IEC60079-1 (2014-06)
*The ambient temperature range which maintains a capability of explosion proof of the label on the detector
head is -40 to +53℃. However, the operating temperature range to maintain gas detection performance is
-20 to +53℃.
Specific conditions of “X”-mark:
Regarding ATEX specification, the measuring function according to Annex II paragraph 1.5.5 of the Directive is not
covered by this EU-type examination.
It shall comply with the requirements from the relevant European harmonized standards which provide guidance on
the performance of gas detection equipment and safety devices.
The flameproof joints not intended to be repaired.
Installation
【GD-A80D-AS/A80DS-AS/A80DN-AS】【GD-A80DV-AS】
Cable
Cable
Installation Dia
g
ram
Hazardous Location Nonhazardous
Location
Indicator/alarm
unit, etc.
Gas Detector Head:
GD-A80D-AS
GD-A80DS-AS
GD-A80DN-AS
Detecting
element
Terminals
for
detecting
element
Installation Dia
g
ram
Hazardous Location Nonhazardous
Location
Indicator/alarm
unit, etc.
Gas Detector Head:
GD-A80DV-AS
Detecting
elemen
t
Terminals
for
detecting
element

2. Important Notices on Safety 2-4. Safety information
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<TIIS Specifications>
Technical Data
(Explosion-proof enclosures) Flame-proof enclosures
(Explosion-proof class) Ex d IIC T4
(Ambient temperature)* -40 - +53ºC
(Rating)
･Detecting element GD-A80D-AS DC3. 0V 430mA or DC5. 0V 200mA
GD-A80DV-AS DC6. 5V 205mA or DC3. 5V 350mA
GD-A80DS-AS DC3. 0V 500mA or DC5. 0V 200mA
GD-A80DN-AS DC3. 3V 170mA or DC1. 0V 220mA
(Applicable Standard) JNIOSH-TR-NO. 43(2008)
*The ambient temperature range which maintains a capability of explosion proof of the label on the detector
head is -40 to +53℃. However, the operating temperature range to maintain gas detection performance is
-20 to +53℃.
Installation
【GD-A80D-AS/A80DS-AS/A80DN-AS】【GD-A80DV-AS】
Cable
Cable
Installation Dia
g
ram
Hazardous Location Nonhazardous
Location
Indicator/alarm
unit, etc.
Gas Detector Head:
GD-A80D-AS
GD-A80DS-AS
GD-A80DN-AS
Detecting
elemen
t
Terminals
for
detecting
element
Installation Dia
g
ram
Hazardous Location Nonhazardous
Location
Indicator/alarm
unit, etc.
Gas Detector Head:
GD-A80DV-AS
Detecting
elemen
t
Terminals
for
detecting
element

4. How to Use 4-6. How to wire
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NOTE
The following table shows an example of overall outer diameters of cables. Use them for reference.
The overall outer diameters must be checked because they somewhat vary between manufacturers.
Number
of core CVV 1. 25 mm2CVV 2 mm2CVVS 1. 25 mm2CVVS 2 mm2
2 Φ9. 2 Φ10. 5 Φ9. 6 Φ10. 5
3 Φ9. 7 Φ11. 0 Φ10. 5 Φ11. 0
4 Φ10. 5 Φ11. 5 Φ11. 0 Φ12. 0
5 Φ11. 5 Φ12. 5 Φ12. 0 Φ13. 0
6 Φ12. 5 Φ13. 5 Φ13. 0 Φ14. 0