Riken Keiki GD-D58-AC User manual

PT2E-1747
Combustible Gas Detector Head
GD-D58・AC
GD-D58・DC
(TYPE GP)
(TYPE NC)
Operating Manual

Operating Precautions
This detector head is a gas detector that detects combustible 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 head 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 head 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 head 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 sensor installed in this detector head 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 head under the presence of silicon or sulfide compounds
even though their amount is very small.
5. For maintenance of the detector head, 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.

- 3 - GD-D58 Series
<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................................................................................................................. 7
2-3. Precautions ..................................................................................................................... 8
2-4. Safety Information ........................................................................................................... 9
3. Product Components ......................................................................................................... 12
3-1. Main unit and standard accessories ................................................................................ 12
3-2. Names and functions for each part.................................................................................. 14
3-3. Block diagram.................................................................................................................. 17
4. How to Use ........................................................................................................................ 19
4-1. Before using the detector head ....................................................................................... 19
4-2. Precautions for installation points.................................................................................... 19
4-3. Precautions for system designing.................................................................................... 20
4-4. How to install ................................................................................................................... 22
4-5. How to wire...................................................................................................................... 24
4-6. How to tube ..................................................................................................................... 32
5. How to Operate.................................................................................................................. 33
5-1. Preparation for start-up ................................................................................................... 33
5-2. Basic operating procedures............................................................................................. 33
5-3. How to start the detector head ........................................................................................ 34
5-4. How to detect .................................................................................................................. 35
5-5. How to exit....................................................................................................................... 35
6. Alarm Activation ................................................................................................................. 36
7. Maintenance ...................................................................................................................... 37
7-1. Maintenance intervals and items ..................................................................................... 37
7-2. Parts replacement ........................................................................................................... 39
8. Storage, Relocation and Disposal...................................................................................... 40
8-1. Procedures to store the detector head or leave it for a long time .................................... 40
8-2. Procedures to relocate the detector head or use it again ................................................ 40
8-3. Disposal of products........................................................................................................ 40
9. Troubleshooting ................................................................................................................. 41
10. Product Specifications........................................................................................................ 43
10-1. List of specifications ...................................................................................................... 43
10-2. Detection principle......................................................................................................... 48
11. Definition of Terms.............................................................................................................. 50

1 Outline of the Product 1-1. Preface
GD-D58 Series - 4 -
1
Outline of the Product
1-1. Preface
Thank you for choosing our fixed-type combustible 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 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 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 AC specification 100 - 110 VAC
GD-D58·DC DC power specification 24 VDC
1-3. Definition of DANGER, WARNING, CAUTION, and
NOTE
DANGER This message indicates that improper handling may cause death or serious
damage on 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.

1 Outline of the Product 1-4. Method of confirmation for Standards and Explosion proof specification
- 5 - GD-D58 Series
1-4. Method of confirmation for Standards and
Explosion proof specification
This instrument has some specification depends on standard and explosion proof certificate. Please
confirm the detector specification before using. Please refer Declaration of Conformity that is at the end of
this manual if you have CE marking type.You can confirm instrument specification to see name plate as
follows.
ATEX, CE marking type name plate TIIS type name plate
(DC power specification only) (AC/DCpowerspecification)
ITRI type name plate
(AC/DC power specification)
CE marking
Ex marking
ITRI certificate
TIIS certificate

2 Important Notices on Safety 2-1. Danger cases
GD-D58 Series - 6 -
2
Important Notices on
Safety
2-1. Danger cases
DANGER
<About explosion-proof>
The window plate material is a polycarbonate resin. Do not use organic solvents and alkali
types (liquid or vapor). It may cause the color and shape of the window plate to be changed.
The flameproof joints are not intended to be repaired.
Do not open the lid when applying current. The lid may be opened after five minutes or more
after power off.
Do not attempt to repair the detector head by the user.
For the lid, use hexagon socket head bolts specified by RIKEN KEIKI.
The drive lid must be closed during use (except during maintenance).

2 Important Notices on Safety 2-2. Warning cases
- 7 - GD-D58 Series
2-2. Warning cases
WARNING
Power supply
Before turning on the detector head, always check that the voltage is properly applied. Do not use
an unstable power supply because it may cause malfunctions.
Need of grounding circuit
Do not cut the grounding circuit or disconnect the wire from the grounding terminal.
Defects in protective functions
Before starting the detector head, check the protective functions for defects. When seeming
defects are found in the protective functions, such as protective grounding, do not start the detector
head.
External connection
Before connecting the detector head to the external control circuit, securely connect it to a
protective grounding circuit.
Zero adjustment in the atmosphere
When the zero adjustment is performed in the atmosphere, check the atmosphere for freshness
before beginning the adjustment. If other gases exist, the adjustment cannot be performed
properly, thus leading to dangers when the gas leaks.
Do not use the low flow rate alarm function under the presence of silicon.
Silicon may accumulate on the sensing part of the flow sensor, which can result in malfunction.
Do not use the low flow rate alarm function under the presence of corrosive gas
Corrosive gas (chlorine, sulfur, acid, alkaline, halogen) may corrode the flow sensor, which can
result in malfunction.
Do not use the low flow rate alarm function under the presence of high-concentrated gas
Under the presence of high-concentrated combustible gas over the lower explosive limit, the flow
sensor may be overheated, which can result in malfunction.

2 Important Notices on Safety 2-3. Precautions
GD-D58 Series - 8 -
2-3. Precautions
CAUTION
Do not use a transceiver or other equipment near the detector head.
Radio wave from a transceiver near the detector head or its cables may disturb operations. If a
transceiver is used, it must be used in a place where it disturbs nothing.
To restart the detector head, wait for five seconds or more before doing it.
Restarting the detector head in less than five seconds may cause errors.
Do not disassemble/modify the detector head, or change the settings if not necessary.
Disassembling/modifying the detector head will invalidate the warranty of the performance.
Changing the settings without understanding the specifications may cause alarm malfunctions.
Please use the detector head properly in accordance with the operating manual.
Avoid applying organic solvents and others to the window plate for a long time.
The window plate material is a polycarbonate resin. When organic solvents (liquid or highly-
concentrated vapor) and others are applied to the plate for a long time, its color and shape may be
changed.
Never fail to perform a regular maintenance.
Since this is a safety unit, a regular maintenance must be performed to ensure safety. Continuing
to use the detector head without performing a maintenance will deteriorate the sensitivity of the
sensor, thus resulting in inaccurate gas detection.
Use the low flow rate alarm function only under the atmosphere of air or nitrogen.
The flow sensor measures the change of radiation amount caused by air current.
Different air type has a different radiation characteristic, which can result in malfunction.
For the following gas types and concentrations, the low flow rate warning function can not be used.
Example) argon, helium, and hydrogen > 5 vol %, carbon dioxide, propane, ethane > 50 vol %,
methane > 25 vol %
When using the low flow rate alarm function, use any filter depending on the operating
environment.
Otherwise dust and/or mist can cause clogging on the flow sensor, which can result in malfunction.
Set a dust filter and/or mist separator on the upstream side of tubing depending on the operating
environment.

2 Important Notices on Safety 2-4. Safety Information
- 9 - GD-D58 Series
2-4. Safety Information
Necessary information for explosion proof construction of Model GD-D58・AC／GD-D58・DC.
This product is a diffusion type gas detector which is basically installing fixed place.
<ATEX Specifications>
Technical Data
(Protection Method) Flameproof enclosure “d”
(Group) II
(Category) 2G
(Type of Protection and Marking code) Ex db ⅡB+H2 T4
(Equipment Protection Level) Gb
(Ambient Temperature) -20C to +53C
(Electrical Data)
Supply voltage : 24 Vdc(Typ.)
Electrical rating : DC3.0V 430mA or DC5.0V 200mA
(Applicable Standard) EN 60079-0 : 2012+A11:2013，EN 60079-1: 2014
Installation
【GD-D58･DC】
＋
－
＋
－
Hazardous Location
(Zone 1)
Nonhazardous Location
GasDetector(GD‐D58・DC)
←→
InstallationDiagram(GD‐D58・DC)
Cable
Indicator
sensor
Power
Shield Cable
sensor

2 Important Notices on Safety 2-4. Safety Information
GD-D58 Series - 10 -
<ITRI Specifications>
Technical Data
(Protection Method) Flameproof enclosure
(Explosion-proofclass) Exd ⅡB+H2 T4 Gb X
(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 : DC3.0V 430mA or DC5.0V 200mA
(Applicable Standard) JNIOSH-TR-NO. 43(2008)
Installation
【GD-D58･AC】 【GD-D58･DC】
＋
－
＋
－
Hazardous Location
(Zone 1)
Nonhazardous Location
GasDetector(GD‐D58・DC)
←→
InstallationDiagram(GD‐D58・DC)
Cable
Indicator
sensor
Power
Shield Cable
sensor
)
(Zone 1)

2 Important Notices on Safety 2-4. Safety Information
- 11 - GD-D58 Series
<TIIS Specifications>
Technical Data
(Protection Method) Flameproof enclosure
(Explosion-proofclass) Exd ⅡB+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 : DC3.0V 430mA or DC5.0V 200mA
(Applicable Standard) JNIOSH-TR-NO. 43(2008)
Installation
【GD-D58･AC】 【GD-D58･DC】
＋
－
＋
－
Hazardous Location
(Zone 1)
Nonhazardous Location
GasDetector(GD‐D58
・ DC)
←→
InstallationDiagram(GD‐D58 ・ DC)
Cable
Indicator
sensor
Power
Shield Cable
sensor
)
(Zone 1)

3 Product Components 3-1. Main unit and standard accessories
GD-D58 Series - 12 -
3
Product Components
3-1. Main unit and standard accessories
<Main Unit> (including cable glands)
Unit: mm
Gas inlet
Gas outlet
Display
4-φ7
(for
M6)
Cable connecting port Cable connecting port

3 Product Components 3-1. Main unit and standard accessories
- 13 - GD-D58 Series
<Standard Accessories>
Operating manual
Dedicated handling lever ......................... 1 lever
Dedicated control key .............................. The control key quantity depends on the number of detector
heads to be delivered.
1 - 10 units 1 key
11 - 20 units 2 keys
21 - 50 units 3 keys
Over 51 units 4 keys
Hex key wrench ....................................... Same number of wrenches as with the test certificates will be
provided.
Dust removal filter with flow monitor ........ 1 filter
NOTE
The dedicated control key is for maintenance. It is not used for detection mode.
Keep it handy for use.
CAUTION
Use the supplied dedicated control key to operate the detector head. If products other than
these accessories are used, key operations cannot be accepted properly.
The control key is made of an extremely strong magnet. Keep it away from a credit card, ID
card, or other magnetic product because stored data may be destroyed.

3 Product Components 3-2. Names and functions for each part
GD-D58 Series - 14 -
3-2. Names and functions for each part
<Display>
(1) MENU/ESC key * Used to enter the maintenance mode.
It is also used to cancel in a specific mode.
(2) SET/ALM key * It is used for value confirmation and so on in a specific
mode.
(3) ▲key * Used to switch menus or change a value (UP).
(4) ▼key * Used to switch menus or change a value (DOWN).
(5) Power lamp
Power lamp.
Detection mode: It lights up in green.
Maintenance mode: It blinks in green.
(6) Fault lamp Fault lamp. It lights up in yellow when an abnormality is
detected in the detector head.
(7) Status display Displays the operating status.
* This is not typically used by the user.
NOTE
The nameplate on the front side of the detector head shows the precautions to be taken for explosion-
proof performances. Read these precautions as well as "2. Important Notices on Safety."
(7) Status display
(5) Power lamp (6) Fault lamp
(1) MENU/ESC key
(2) SET/ALM key (4) ▼key
(3) ▲key

3 Product Components 3-2. Names and functions for each part
- 15 - GD-D58 Series
<Inside of the main unit> (Electric circuit section)
(1) Terminal plate (for power supply) Power input terminal plate (GD-D58·AC: 3-pole, GD-
D58·DC: 2-pole).
(2) Terminal plate (for transmission) Terminal plate for transmission.
(3) Power switch Power switch of the detector head (GD-D58·AC only).
(4) Grounding terminal Terminal for grounding (M4 x 6).
(5) Fuse Main power fuse (GD-D58·AC only).
NOTE
Open the electric circuit lid.
Remove the electric circuit lid and display unit to find behind them the electric circuit section shown in
the figure above.
Power input terminal plates are GD-D58·AC: 3-pole and GD-D58·DC: 2-pole.
A fter use, closely tighten the lid until the thread is no longer seen (clockwise 8 rotations +1/4 rotation
or more) and the "TOP" marking faces upward. Tighten the hexagon socket set screw with a
tightening torque of 107.8±12.7 N・cm.
(1) Terminal plate
(for power supply)
(2) Terminal plate
(for transmission)
(3) Power switch
(4) Grounding terminal
(5) Fuse
* The figure above shows
GD-D58·AC.
Display unit
Electric circuit lid
Open
Close
Specialized tool (Option)
Hexagon socket set screw

3 Product Components 3-2. Names and functions for each part
GD-D58 Series - 16 -
Drive lid
<Inside of the main unit> (Drive section)
(1) Gas sensor Gas detection sensor.
(2) Flow sensor Sensor for detection of low flow rate.
(3) Pump Sample draw pump.
NOTE
Open the drive lid and the hexagon socket head bolts
on the four corners.
Remove the drive lid to find the drive section shown in
the figure above.
The bolt with the hexagon socket must use the
stainless steel material of property class "A2-70".
Grease specified by RIKEN KEIKI : 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
(2) Flow sensor
(1) Gas sensor
(3) Pump

3 Product Components 3-3. Block diagram
- 17 - GD-D58 Series
3-3. Block diagram
<Electric Diagram>
GD-D58·AC
Gas sensor
Controller
(CPU)
POWER OUTPUT (24 VDC)
AC/DC converter
Display
(POWER) (FAULT)
Seven-segment LED
(four-digit)
Magnetic operation part
(MENU/ESC) (▲) (▼) (SET)
Flow sensor
POWER INPUT
(
100 - 110 VAC
)
Power supply part Pump

3 Product Components 3-3. Block diagram
GD-D58 Series - 18 -
<Electric Diagram>
GD-D58·DC
Gas sensor
Controller
(CPU)
Display
(POWER) (FAULT)
Seven-segment LED
(four-digit)
Magnetic operation part
(MENU/ESC) (▲) (▼) (SET)
Flow sensor
POWER INPUT (24 VDC)
Power supply part Pump

4 How to Use 4-1. Before using the detector head
- 19 - GD-D58 Series
4
How to Use
4-1. Before using the detector head
Not only the first-time users but also the users who have already used the product must follow the
operating precautions.
Ignoring the precautions may damage the detector head, resulting in inaccurate gas detection.
4-2. Precautions for installation points
Do not install the detector head in a place with vibrations or shocks.
The detector head consists of sensitive electronic parts. The detector head must be installed in a stable
place without vibrations or shocks and it cannot drop.
Do not install the detector head in a place exposed to water, oil or chemicals.
When selecting installation points, avoid a place where the detector head is exposed to water, oil or
chemicals.
Do not install the detector head in a place where the range of operating temperatures is exceeded.
The detector head must be installed in a stable place where the operating temperature is maintained and
do not change suddenly.
＜ATEX Specifications＞ GD-D58・DC：-20℃～+53℃
＜ITRI Specifications＞GD-D58・AC：-20℃～+50℃／GD-D58・DC：-20℃～+53℃
＜TIIS Specifications＞GD-D58・AC：-20℃～+50℃／GD-D58・DC：-20℃～+53℃
Do not install the detector head in a place exposed to direct sunlight or sudden changes in the
temperature.
When selecting installation points, avoid a place where it is exposed to direct sunlight or radiant heat
(infrared rays emitted from a high-temperature object), and where the temperature changes suddenly.
Condensation may be formed inside the detector head, or the detector head cannot adjust to sudden
changes in the temperature.
CAUTION
This detector head is a precision device. Because the detector head may not provide the
specified performance in some places (environments), check the environment in the installation
point, and then take appropriate actions if necessary.
Because the detector head plays an important role for safety and disaster prevention, as many
units of the detector head as needed must be installed in appropriate points.
Because points where gases leak and remain easily are different depending on the types of
gases and the working areas, please decide carefully on installation points and the number of
units to be installed.

4 How to Use 4-3. Precautions for system designing
GD-D58 Series - 20 -
Keep the detector head (and its cables) away from noise source devices.
When selecting installation points, avoid a place where high-frequency/high-voltage devices exist.
Do not install the detector head in a place where maintenance of the detector head cannot be performed
or where handling the detector head involves dangers.
Regular maintenance of the detector head must be performed.
Do not install the detector head in a place where the machinery must be stopped when maintenance is
performed in its inside, where parts of the machinery must be removed to perform maintenance, or where
the detector head cannot be removed because tubes or racks prevent access to it. Do not install the
detector head in a place where maintenance involves dangers, for example, near a high-voltage cable.
Do not install the detector head in machinery which is not properly grounded.
Before installing the detector head in machinery, the machinery must be grounded properly.
Do not install the detector head in a place where other gases exist around it.
The detector head must not be installed in a place where other gases exist around it.
4-3. Precautions for system designing
Using a stable power supply
The external output and alarm contact of the detector head may be activated when the power is turned on,
when momentary blackout occurs, or while the system is being stabilized. In such cases, use a UPS
(uninterrupted power supply), or take appropriate actions on the receiving side of output signals.
The detector head must be provided with the following power supply.
Power supply voltage
GD-D58·AC: 100 - 110 VAC ±10%, 50/60Hz: Terminal voltage of the detector
head
GD-D58·DC: 24 VDC
10% : Terminal voltage of the detector head
Allowed time of
momentary blackout
GD-D58·AC:
Less than approx. 200 msec
(To recover from the momentary
blackout for 200 milliseconds or more,
restart the detector head.)
GD-D58·DC:
Less than approx. 10 msec
(To recover from the momentary
blackout for 10 milliseconds or more,
restart the detector head.)
Example of actions
To ensure continuous operation and
activation, install an UPS outside the
detector head.
Others
Do not use it with a power supply of
large power load or high-frequency
noise.
Example of actions
Use a line filter to avoid the noise
source if necessary.
CAUTION
An unstable power supply and noise may cause malfunctions or false alarms.
The descriptions in this section must be reflected on the designing of a system using the detector
head.