Riken Keiki GD-D58-AC-GH User manual

PT2E-20010
Combustible・Toxic Gas Detector Head
GD-D58・AC・GH
GD-D58・DC・GH
Operating Manual

Operating Precautions
This detector is a gas detector that detects combustible/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 and vapors other than the gas to be detected.
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.
The alarm contact output of the detector must be used for an external alarm lamp/buzzer, while the
alarm signal output must be used for an indicator or external recorder.
If these outputs are used to control other units, we shall not be responsible for any malfunctions.
4. The gas sensing part of the gas detection sensor installed in this detector is made of metal porous
sintered alloy permeated with an oxidation catalyst.
If silicon or sulfide compounds are accumulated on the surface of porous sintered alloy, the area of the
gas sensing part becomes smaller, which may results 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 gas calibration are performed
every six months in accordance with the regulations.

GD-D58 Series
<Contents>
1. Outline of the Product.............................................................................................. 1
1-1. Preface .................................................................................................................... 1
1-2. Purpose of use ........................................................................................................ 1
1-3. Definition of DANGER, WARNING, CAUTION, and NOTE ..................................... 2
1-4. Method of confirmation for Standards and Explosion proof specification ................ 2
2. Important Notices on Safety .................................................................................... 3
2-1. Danger cases .......................................................................................................... 3
2-2. Warning cases......................................................................................................... 4
2-3. Precautions ............................................................................................................. 5
2-4. Safty information .....................................................................................................
3. Product Components............................................................................................... 10
3-1. Main unit and standard accessories ........................................................................ 10
3-2. Names and functions for each part.......................................................................... 12
3-3. Block diagram.......................................................................................................... 15
4. How to Use.............................................................................................................. 17
4-1. Before using the detector head ............................................................................... 17
4-2. Precautions for installation points............................................................................ 17
4-3. Precautions for system designing............................................................................ 18
4-4. How to install ........................................................................................................... 20
4-5. How to wire.............................................................................................................. 22
4-6. How to tube ............................................................................................................. 29
5. How to Operate ....................................................................................................... 30
5-1. Preparation for start-up............................................................................................ 30
5-2. Basic operating procedures..................................................................................... 30
5-3. How to start the detector head ................................................................................ 31
5-4. How to detect .......................................................................................................... 32
5-5. How to exit............................................................................................................... 32
6. Alarm Activation....................................................................................................... 33
7. Maintenance............................................................................................................ 34
7-1. Maintenance intervals and items ............................................................................. 34
7-2. Parts replacement ................................................................................................... 36
8. Storage, Relocation and Disposal ........................................................................... 37
8-1. Procedures to store the detector head or leave it for a long time ............................ 37
8-2. Procedures to relocate the detector head or use it again ........................................ 37
8-3. Disposal of products................................................................................................ 37
9. Troubleshooting....................................................................................................... 38
10. Product Specifications ............................................................................................. 40
10-1. List of specifications ................................................................................................ 40
10-2. Detection principle................................................................................................... 45
11. Definition of Terms................................................................................................... 46
6

1 Outline of the Product 1-1. Preface
GD-D58 Series - 1 -
1
Outline of the Product
1-1. Preface
Thank you for choosing our fixed-type combustible/toxic gas detector head GD-D58 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 head and its specifications. It contains information required
for using the detector head 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 head.
Note that the detector head cannot be used by itself. Be sure to use it in combination with the dedicated
indicator/alarm unit. Read also the operating manual of the indicator/alarm unit.
1-2. Purpose of use
This detector head is a fixed type gas detector head which detects combustible/toxic gases.
Use this detector head in combination with an indicator/alarm unit that indicates a gas concentration
and triggers an alarm.
The detector head detects combustible/toxic gases and outputs voltages according to gas
concentrations. The indicator/alarm unit both indicates a gas concentration and, if a preset
concentration level is exceeded, triggers an alarm.
The detector head 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 head before using it, so that it can be used properly.
The detector head draws air with the built-in pump and detects abnormalities in the air caused by
presence of gases or other reasons (leak) with the built-in gas sensor.
The detector head has a built-in low flow rate detection function and can trigger a fault alarm when the
flow rate inside the tubing drops below a fixed rate.
The detector head has two types of power supply specifications.
GD-D58·AC·GH AC power specification 100 - 110 VAC
GD-D58·DC·GH DC power specification 24 VDC

2 Important Notices on Safety 2-4. Safety Information
GD-D58 Series - 6 -
2-4. Safety Information
Necessary information for explosion proof construction of Model GD-D58・AC・GH／ＧD-D58・DC・
GH.
This product is a diffusion type gas detector which is basically installing fixed place.
<ATEX/UKEX Specifications>
Technical Data
(Protection Method) Flameproof enclosure “d”
(Certificatenumbers) DNV21ATEX63457X
DNV 22 UKEX 25926X
(Group) Ⅱ
(Category) 2G
(Type of Protection and Marking code) Ex db h ⅡB+H2 T4
(Equipment Protection Level) Gb
(Ambient Temperature) -20C to +53C
(Electrical Data)
Supply voltage : 24 Vdc(Typ.)
Output signal : DC3.0V 430mA
Sensor power supply : Gas sensor DC6.5V 205mA or DC3.5V 350mA
Flow sensor DC2.0V 170mA
(Applicable Standard) EN IEC 60079-0 : 2018，EN 60079-1: 2014
BS EN IEC60079-0:2018, BS EN 60079-1:2014
Specific conditions of “X”-mark:
Fasteners used for enclosure arefrom stainless steel property class A2-70.
Cable gland may not provide sufficient clamping. User shall provide additional clamping of the cable to
ensure that pulling and twisting isnot transmitted to the terminations.
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 measuring function according to schedule 1, paragraph 24 of the Regulation is not covered in this UK-
type examination. It shall comply with the requirements from the relevant UK Designated Standards which
provide guidance on the performance of gas detection equipment.
The flameproof joints not intended to be repaired.
Enclosure made of Aluminum – Avoid impact or Friction in the equipment.

2 Important Notices on Safety 2-4. Safety Information
- 7 - GD-D58 Series
Installation
【GD-D58･DC･GH】

2 Important Notices on Safety 2-4. Safety Information
GD-D58 Series - 8 -
<Taiwan Ex(TS) Specifications>
Technical Data
(Protection Method) Flameproof enclosure
(Explosion-proofclass) ExdⅡB+H2 T4 Gb
(AmbientTemperature) TypeAC:-20C to 50C
Type DC: -20C to 53C
(Electrical Data)
Supply voltage : Type AC: AC100～110V 50/60Hz 120mA
Type DC: DC24V 360mA
Electrical rating : DC6.5V 205mA or DC3.5V 350mA
(Applicable Standard) JNIOSH-TR-NO. 43(2008)
Installation
【GD-D58･AC･GH】 【GD-D58･DC･GH】

2 Important Notices on Safety 2-4. Safety Information
- 9 - GD-D58 Series
<Japan Ex Specifications>
Technical Data
(Protection Method) Flameproof enclosure
(Explosion-proofclass) ExdⅡB+H2 T4
(AmbientTemperature) TypeAC:-20C to 50C
Type DC: -20C to 53C
(Electrical Data)
Supply voltage : Type AC: AC100～110V 50/60Hz 120mA
Type DC: DC24V 360mA
Electrical rating : DC6.5V 205mA or DC3.5V 350mA
(Applicable Standard) JNIOSH-TR-NO. 43(2008)
Installation
【GD-D58･AC･GH】 【GD-D58･DC･GH】