Riken Keiki GD-1DOX-AS User manual

PT2E-2880
Fixed type Oxygen Detector Head
GD-1DOX-AS
Operating Manual
(PT2-183)

Operating Precautions
The detector detects oxygen in the atmosphere and prevents acid-deficient accidents due to acid-deficient
air release or accidents due to excessive oxygen.
Please fully understand the following points before using it, so that it can be used properly.
1. The detector may be interfered by gases and vapors other than oxygen in the atmosphere.
In addition, it may be fluctuated by environmental (temperature, humidity etc.) changes in the
installation site.
2. The detector is affected by pressure. If the detector is used at a pressure other than atmospheric
pressure, a calibration is required under that pressure. The maximum allowable pressure is 110 KPa.
The detector cannot be used under reduced pressure.
3. The gas sensor used by the detector contains an electrolyte. Electrolyte may cause severe skin burns if
it contacts skin, while it may cause blindness if its contacts eyes. Do not touch the sensor directly in the
event of a liquid leak.
4. 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 span adjustment are performed
every six months.

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<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
2 Important Notices on Safety .................................................................................................. 3
2-1. Danger cases.................................................................................................................... 3
2-2. Warning cases................................................................................................................... 4
2-3. Precautions ....................................................................................................................... 5
2-4. Safety Information ............................................................................................................. 6
3 Product Components............................................................................................................. 7
3-1. Main unit and standard accessories.................................................................................. 7
3-2. Names and functions for each part ................................................................................... 8
4 How to Use............................................................................................................................ 10
4-1. Before using the gas detector ........................................................................................... 10
4-2. Precautions for installation sites........................................................................................ 10
4-3. Precautions for system designing ..................................................................................... 11
4-4. How to install..................................................................................................................... 12
4-5. Installation procedure........................................................................................................ 13
4-6. How to wire ....................................................................................................................... 14
4-7. How to tube....................................................................................................................... 17
5 How to Operate ..................................................................................................................... 18
5-1. Preparation for start-up ..................................................................................................... 18
5-2. Basic operating procedures............................................................................................... 18
5-3. How to start the gas detector ............................................................................................ 19
5-4. Flow Rate Adjustment ....................................................................................................... 20
5-5. How to exit ........................................................................................................................ 20
6 Maintenance.......................................................................................................................... 21
6-1. Maintenance intervals and items....................................................................................... 21
6-2. Calibration method ............................................................................................................ 23
6-3. Replacement parts ............................................................................................................ 26
7 Storage, Relocation and Disposal ......................................................................................... 27
7-1. Procedures to store the gas detector or leave it for a long time ........................................ 27
7-2. Procedures to relocate the detector or use it again........................................................... 27
7-3. Disposal of products.......................................................................................................... 27
8 Troubleshooting..................................................................................................................... 28
9 Product Specifications........................................................................................................... 29
9-1. List of specifications .......................................................................................................... 29
9-2. Detection principle............................................................................................................. 30
10 Definition of Terms............................................................................................................... 31

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 type oxygen detector head GD-1DOX-AS. 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 that detects oxygen 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.
•Use the detector in combination with an indicator/alarm unit that indicates an oxygen concentration
and triggers an alarm.
•The detector draws a gas by an aspirator using compressed air to perform gas detection.
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 2-1. Danger cases
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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.
•Do not open the lid when applying current.
•Do not attempt to repair the detector.
•For the lid, use hexagon socket head bolts specified by RIKEN KEIKI.
•Do not apply a strong force or shock to the window plate. The explosion-proof performances
may be deteriorated due to damages. The explosion protection condition for the detector is
"low (2J)" possibility of mechanical damage.
Ambient temperature: -20 to +53°C
(The ambient temperature on explosion-proof certification is described above and it indicates
the temperature range which can maintain the explosion-proof performance and not the
product performance, see “9-1. List of specifications” for details.)
•Do not replace parts at your sole discretion but contact RIKEN KEIKI if the transparent window
has a crack or the explosion-proof joint surface is abnormal, or the clamping screw or bolt is
changed, lost etc.
•Do not repair the explosion-proof joint surface.
•Be careful not to hit sharp tools against the window plate.

2 Important Notices on Safety 2-2. Warning cases
- 4 -
2-2. Warning cases
WARNING
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, check the protective functions for defects. When seeming defects are
found in the protective functions, such as protective grounding, do not start the detector.
Tubing
The detector is designed to draw gases around it under the atmospheric pressure. Be sure that
excessive pressure is not applied to the sampling inlet and outlet (GAS IN, GAS OUT) of the
detector. Detected gases must be exhausted from the detected gas exhausting outlet (GAS OUT)
to which an exhaust tube is connected, to a point regarded as a safe place.
Span adjustment (AIR adjustment) in atmosphere
When the span adjustment (AIR adjustment) is performed in the atmosphere, check the
atmosphere for freshness before beginning the adjustment. If interference gases exist, the
adjustment cannot be performed properly, thus leading to dangers when the oxygen concentration
fluctuates.
Response to gas alarm
Issuance of a gas alarm indicates that there are extreme dangers. Take proper actions based on
your judgment.
Handling of sensor
Do not disassemble the sensor used by the detector because it contains electrolyte. Electrolyte
may cause severe skin burns if it contacts skin, while it may cause blindness if its contacts eyes. If
electrolyte is adhered on your clothes, that part on your clothes is discolored or its material is

2 Important Notices on Safety 2-3. Precautions
- 5 -
2-3. Precautions
CAUTION
Do not use a transceiver near the detector.
Radio wave from a transceiver or other radio wave transmitting device near the detector or its
cables may disturb readings. If a transceiver or other radio wave transmitting device is used, it
must be used in a place where it disturbs nothing.
Verify that the flow rate corresponds to the specified flow rate before using the detector.
If it does not correspond to the specified flow rate, gas detection cannot be performed properly.
Check whether the flow rate is unstable or lost.
Attach the dust filter before using the detector.
Before using the detector, attach the specified filter to prevent disturbances by possible gas
adsorption or air dust.
A dust filter to be used varies depending on the gas to be detected. For more information on dust
filters, please contact RIKEN KEIKI.
Observe the operating restrictions to prevent condensation inside the tube.
Condensation formed inside the tube causes clogging or gas adsorption, which may disturb
accurate gas detection. Thus, condensation must be avoided. In addition to the installation
environment, carefully monitor the temperature/humidity of the sampling point to prevent
condensation inside the tube. In particular, when detecting a gas which is dissolved into water and
corrodes contacted materials, such as a strong acid gas, the gas is undetectable and furthermore
may corrode internal parts. Please observe the operating restrictions.
Do not disassemble/modify the detector, or change the settings if not necessary.
Disassembling/modifying the detector will invalidate the warranty of the performance. Changing the
settings without understanding the specifications may cause alarm malfunctions. Please use the
detector 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 without performing a maintenance will deteriorate the sensitivity of the sensor,
thus resulting in inaccurate gas detection.

2 Important Notices on Safety 2-4. Safety Information
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2-4. Safety Information
Necessary information for explosion proof construction of Model GD-1DOX.
When oxygen is detected, the unit outputs a voltage corresponding to the oxygen concentration, and the
indicator/alarm unit instructs the concentration, and when the concentration becomes equal to or lower
than a preset concentration level (or higher), the alarm is activated by the indicator/alarm unit.
<TIIS Specifications>
Technical Data
(Protection Method) Flameproof enclosure
(Explosion-proof class) Ex d IIC T6 X
(Ambient Temperature)* -20°C to +53°C
(Electrical Data) Detecting element output signal: DC0.1V 0.2mA
(Applicable Standard) JNIOSH-TR-NO. 43(2008)
*The ambient temperature on explosion-proof certification is described above and it indicates the
temperature range which can maintain the explosion-proof performance and not the product performance,
see “9-1. List of specifications” for details.
Installation
Indicator/alarm unit
Gas detector
(GD-1DOX)
Installation diagram
Hazardous location
Non-hazardous location
CVVS-2C
(1.25mm2or2mm2)

3 Product Components 3-2. Names and functions for each part
- 9 -
<Tubing Diagram>
Tubing specification
* The customer is required to provide the followings.
(Alternate long and two short dashed line) Polyurethane tube (ø6 - ø8): X
Polyurethane tube (ø4 - ø6): Y
* Internal tubing has been arranged already.
(Dashed line) Polyurethane tube: ①
Polyurethane tube: ②
(Alternate long and short dashed line) Copper tube (ø4 - ø6): ③
(Solid line) Copper tube (ø6 - ø8): ④
MC filter with
flow monitor
Measuring
Gas inlet
Gas/air outlet
Compressed
air inlet
Needle valve
Aspirator

4 How to Use 4-1. Before using the gas detector
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4
How to Use
4-1. Before using the gas detector
Not only the first-time users but also the users who have already used the detector must follow the
operating precautions.
Ignoring the precautions may damage the gas detector, resulting in inaccurate gas detection.
4-2. Precautions for installation sites
Do not install the detector in a place with vibrations or shocks.
The detector consists of sensitive electronic parts. The detector must be installed in a stable place without
vibrations or shocks and it cannot drop.
Do not install the detector in a place exposed to water, oil or chemicals.
When selecting installation points, avoid a place where the detector is exposed to water, oil or chemicals.
Do not install the detector in a place where the range of operating temperatures is exceeded.
The detector must be installed in a stable place where the operating temperature is maintained and does
not change suddenly.
<TIIS Specifications> -10 to +40°C
Do not install the detector 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, or the detector cannot adjust to sudden changes in the
temperature.
Keep the detector (and its cables) away from noise source devices.
When selecting installation points, avoid a place where high-frequency/high-voltage devices exist.
CAUTION
This is a precision device. Because the detector 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 plays an important role for safety and disaster prevention, as many units of
the detector 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
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Do not install the detector in a place where maintenance of the detector cannot be performed or where
handling the detector involves dangers.
Regular maintenance of the detector must be performed.
Do not install the detector 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 cannot be removed because tubes or racks prevent access to it. Do not install the detector in
a place where maintenance involves dangers, for example, near a high-voltage cable.
Do not install the detector in machinery which is not properly grounded.
Before installing the detector in machinery, the machinery must be grounded properly.
Do not install the detector in a place where interference gases exist around it.
The detector must not be installed in a place where interference gases exist around it.
4-3. Precautions for system designing
Introducing protective measures against lightning
If cables are installed outside the factory/plant, or if internal cables are installed in the same duct as the
cables coming from outside the factory/plant, "lightning" will cause problems. Because lightning acts as a
large emission source while cables act as a receiving antenna, devices connected to the cables may be
damaged.
Lightning cannot be prevented. Cables installed in a metal conduit or under the ground cannot be
completely protected from inductive lightning surge caused by lightning. Although complete elimination of
disasters caused by lightning is impossible, the following protective measures can be taken.
Protection against
lightning
Take appropriate measures in accordance with the importance of the facilities and
the environment.
•Provide protection by a lightning arrester (cable arrester).
(Although inductive lightning surge can be transmitted through the cable, it is
prevented by installing a lightning arrester before the field devices and central
processing equipment. For information on how to use a lightning arrester,
please contact the manufacturer.)
Grounding
In addition to lightning, there are more sources of surge noise. To protect units from
these noise sources, the units must be grounded.
* The lightning arrester has a circuit to remove a surge voltage which damages field devices, so that
signals may be attenuated. Before installing a lightning arrester, verify that it works properly.
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.
WARNING
An oxygen detector is affected by pressure. If the detector is used at a pressure other than
atmospheric pressure, a calibration is required under that pressure. The maximum allowable
pressure is 110 KPa. The detector cannot be used under reduced pressure. Using the detector at a
pressure exceeding the allowable range may cause a trouble in the oxygen sensor performance.

4 How to Use 4-4. How to install
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4-4. How to install
<Installation Dimensions and Maintenance Space>
The following installation requirements must be met to install the detector.
•Attach the detector on the wall and others using four M6 screws.
NOTE
・Hexagon socket head cap bolt with strength class "A2-70" are used.
When you lost or replace it, we recommend that you ask our local sales office nearest you.
・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
CAUTION
•Do not install the detector in a place where maintenance of the detector cannot be performed
or where handling the detector involves dangers.
Regular maintenance of the detector must be performed.
Do not install the detector 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 cannot be removed because tubes or racks prevent access
to it. Do not install the detector in a place where maintenance involves dangers, for example,
near a high-voltage cable.
•If the detector is to be fixed on a wall or the like, install it properly where can hold its weight.
Unit: mm
Wall
4-φ8 (for M6)

4 How to Use 4-6. How to wire
- 15 -
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 mm2
CVV 2 mm2
CVVS 1.25 mm2
CVVS 2 mm2
2
ø9.5
ø10.5
ø10.0
ø11.0
3
ø10.0
ø11.0
ø10.5
ø11.5
4
ø10.5
ø11.5
ø11.0
ø12.0
5
ø11.5
ø12.5
ø12.0
ø13.0
6
ø12.5
ø13.5
ø13.0
ø14.0
When the four hexagon socket head bolts of the gas detector head "GD-1DOX" are loosened and the lid is
opened, the following terminal plate appears. There is one protective grounding terminal on each side.
<Figure of Terminal Plate>
Torque value : Max. 1.2 N･m
<Compatible round terminal>
For a round terminal, the following items are available.
TEMV 1.25 – 4M
TEMV 2 – 4M
CAUTION
・A round terminal of the specified model must be used. Using other bar terminals invalidates the
warranty of the performance.
・Be sure to use the terminal block cover.

4 How to Use 4-7. How to tube
- 17 -
CAUTION
•The longer the tube of the GAS IN is, the longer it takes for a gas to reach the detector.
Because some gases have a highly adsorptive property for the tube, resulting in a slow
response and a lower reading than the actual value, the length of the GAS IN tube must be
minimized.
•When the humidity in the sampling point is high, condensation may be formed inside of the
tube. Make sure to avoid condensation when using a gas which is dissolved into water and
corrodes contacted materials, such as a strong acid gas, because it is undetectable and
furthermore may corrode internal parts. Also avoid an excessive U-shaped or V-shaped tube
piping.
•Determine the inlet for the sample gas, considering the air flow of the sample gas line and the
gas generating process.
•To remove dust, do not forget to attach a dust filter in the middle of the tube.
•You need to decide the length and material of the tube. Please contact RIKEN KEIKI for more
information.
WARNING
•The detector is designed to draw gases around it under the atmospheric pressure.
Be sure that excessive pressure is not applied to the sampling inlet and outlet (GAS IN, GAS
OUT) of the detector.
•Detected gases must be exhausted from the detected gas exhausting outlet (GAS OUT) to
which an exhaust tube is connected, to a point regarded as a safe place.
4-7. How to tube
The detector has a Rc1/8 thread inside of the sampling inlet/outlet (GAS IN, GAS OUT), the "PP" unions is
normally attached. Because their material varies depending on the gas to be used, please specify the
appropriate unions.
The compatible tube is a tube of Φ6 (OD) - Φ4 (ID). The tube must be installed with the supplied inners
and sleeves attached to prevent a leak.
When the tube is cut, its cut point has a smaller inner diameter. Use a file etc. to expand the inner diameter
of the cut point. To remove cut-dust remaining inside of the tube, blow compressed air into the tube before
connecting it to the detector.
Some sample gases have highly adsorptive or corrosive property. Select the tube material taking into
account of these precautions.
Be careful that the flow rate introduced to the detector is in the range of 0.8 - 2 L/min (the maximum
pressure inside the flow path and sensor parts is 10.13 kPa <gauge pressure>).

5 How to Operate 5-1. Preparation for start-up
- 18 -
5
How to Operate
5-1. Preparation for start-up
Before connecting a power supply, read and understand the following precautions. Ignoring these
precautions may cause an electric shock or damage the detector.
•Check that the detector is installed properly.
•Connect the detector to a grounding circuit.
•Check that the wiring is connected to external device properly.
•Check that the power supply voltage is compliant with the specifications.
•Check that there is no clogging or leak in the connected tube. (If the connected tube is clogged,
pressure is applied to the sensor, causing errors and malfunctions.)
•Check that the filter is attached properly. (The filter is specified based on the gas to be detected.)
5-2. Basic operating procedures
Before supplying power to the detector, check that the preparations described in "5-1. Preparation for
start-up" are completed. The detector lacks a power switch. Analog output from the oxygen sensor is
sent directly to the indicator/alarm unit via the cable connected without signal conversion. Assuming the
cables are correctly connected, the detector will start operating as soon as the indicator/alarm unit power
is turned on. Turn on the indicator/alarm unit power and check that it functions normally with reference to
the operating manual of the indicator/alarm unit.
Span adjustment must be performed when a detector is first installed. Indicated oxygen concentrations
may be incorrect until this adjustment has been made.
CAUTION
• When installing for the first time, adjust as described in "6-2. Calibration method" to ensure the
indicator/alarm unit displays accurate oxygen concentrations. Adjust the indicator/alarm unit.
The detector itself cannot be adjusted. For information on adjusting the indicator/alarm unit,
refer to the indicator/alarm unit operating manual.