PT2E-2307

Smart Transmitter/Gas Detector Head

SD-1OX(TYPE H)
Operating Manual(PT2E-177)(PT2-177)Operating Precautions
This detector is an oxygen deficiency detector that detects oxygen in the air and triggers an oxygen
deficiency alarm.
The oxygen deficiency detector is a safety unit, not an analyzer or densitometer which performs
quantitative/qualitative analysis/measurement for oxygen.
Please fully understand the following points before using it, so that it can be used properly.
1. The readings of the detector fluctuate slightly in response to changes in the air pressure.
In particular, be careful of alarm activation when a low air pressure is brought in by typhoon. 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.
The standard alarm setpoint value is 18 vol%.
3. If use in safety unit, the analog signal output of the detector 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. 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 span adjustment are performed
every six months.

<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 ............................................................................................................. 9
3-1. Main unit and standard accessories .................................................................................. 9
3-2. Names and functions for each part ................................................................................... 10
3-3. Block diagram ................................................................................................................... 11
4 How to Use ............................................................................................................................ 124-1. Before using the gas detector ........................................................................................... 12
4-2. Precautions for installation sites ........................................................................................ 12
4-3. Precautions for system designing ..................................................................................... 13
4-4. How to install ..................................................................................................................... 14
4-5. Installation procedure ........................................................................................................ 16
4-6. How to wire ....................................................................................................................... 17
5 How to Operate ..................................................................................................................... 21
5-1. Preparation for start-up ..................................................................................................... 21
5-2. Basic operating procedures............................................................................................... 21
5-3. How to start the gas detector ............................................................................................ 22
5-4. Modes ............................................................................................................................... 23
5-5. User mode......................................................................................................................... 24
5-6. How to exit ........................................................................................................................ 26
6 Operations and Functions ..................................................................................................... 27
6-1. Alarm activation ................................................................................................................. 27
6-2. Fault alarm activation ........................................................................................................ 28
6-3. External output operation .................................................................................................. 29
6-4. Other functions .................................................................................................................. 30
7 Maintenance .......................................................................................................................... 31
7-1. Maintenance intervals and items ....................................................................................... 31
7-2. Maintenance Mode(Regular maintenance) ....................................................................... 33
7-3. Gas calibration method ..................................................................................................... 40
7-4. Parts replacement ............................................................................................................. 43
8 Storage, Relocation and Disposal ......................................................................................... 45
8-1. Procedures to store the gas detector or leave it for a long time ........................................ 45
8-2. Procedures to relocate the detector or use it again ........................................................... 45
8-3. Disposal of products .......................................................................................................... 45
9 Troubleshooting ..................................................................................................................... 46
10 Product Specifications ......................................................................................................... 48
10-1. List of specifications ........................................................................................................ 48
10-2. List of accessories........................................................................................................... 51
10-3. 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-1OX(TYPE H). Please check that themodel 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.
Product specifications may be abbreviated in this document as follows.
Japan Ex specification ： Japan specification
ATEX / IECEx / UKEX specification ： Export specification

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 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.
The detector outputs gas concentration in 4 – 20 mA.
The detector has HART communication function.

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. Please refer Declaration of Conformity that is at the end of
this manual if you have CE/UKCA marking type. You can confirm instrument specification to see name plate
as follows.
Ex marking

Japan Ex certificate
UKCA marking
CE marking

ATEX/IECEx/UKEX, CE/UKCA marking type name plate-3-

Japan Ex type name plate2 Important Notices on Safety

2-1. Danger cases

2

Important Notices on
Safety2-1. 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:
Export Specification: -20 to +60°C
Japan Specification: -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 “10-1. 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 ischanged, lost etc.

Do not repair the explosion-proof joint surface.
Be careful not to hit sharp tools against the window plate.

-4-2 Important Notices on Safety

2-2. Warning cases

2-2. Warning cases
WARNING
Power supply
Before turning on the detector, 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, check the protective functions for defects. When seeming defects arefound in the protective functions, such as protective grounding, do not start the detector.
External connection
Before connecting the detector to the external control circuit, securely connect it to a protective
grounding circuit.
Span adjustment in atmosphere
When the span 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 onyour 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. Ifelectrolyte is adhered on your clothes, that part on your clothes is discolored or its material isdecomposed. If contact occurs, rinse the area immediately with a large quantity of water.

-5-2 Important Notices on Safety

2-3. Precautions

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.
To restart the detector, wait for five seconds or more before doing it.
Restarting the detector in less than five seconds may cause errors.
Do not use the external output of the detector to control other units.
This is not a control unit. It is not allowed to use the external output of the detector to control otherunits.
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 thesettings without understanding the specifications may cause alarm malfunctions. Please use thedetector 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.

-6-

2 Important Notices on Safety

2-4. Safety Information

2-4. Safety Information
Necessary information for explosion proof construction of Model SD-1OX.
The Model SD-1OX is a fixed mount, continuous-monitoring detector head and provides a 4-20mA signal
which indicates the target gas reading for use by a gas monitoring controller, recording device, or
programmable controller.
<ATEX/IECEx/UKEX Specification>
Technical Data
(Protection Method)(Certificate Numbers)(Group)(Category)(Type of Protection and Marking code)(Equipment Protection Level)(Ambient Temperature)*(Electrical Data)(Applicable Standard)(Manual Number)

Flameproof enclosure “d”
IECEx DEK 13.0024X
DEKRA 13ATEX0035 X
DEKRA21UKEX0368X
II
2G
Ex db IIC T6
Gb-20C to +60C
Supply voltage: DC24 V (Typ.)
Output signal (4 to 20 mA): DC24V 22mA
IEC 60079-0: 2017，IEC 60079-1: 2014-06
EN IEC 60079-0: 2018，EN 60079-1: 2014
BS EN IEC 60079-0:2018, BS EN 60079-1:2014
PT2E-177* The ambient temperature on explosion-proof certification is described above and it indicates thetemperature range which can maintain the explosion-proof performance and not the product performance,
see “10. Product specifications” for details.
Installation
Installation Diagram
Hazardous Location(Zone 1)←→

Nonhazardous Location

Gas Detector (SD-1OX)

Indicator etc.
CVVS Cable

24V ＋
GND －
Signal ＋
Signal －24V
GND＋ Signal－ Signal-7-2 Important Notices on Safety

2-4. Safety Information<Japan Ex Specification>
Technical Data
(Protection Method)

Flameproof enclosure(Explosion-proof class)

Ex d IIC T6 X

(Ambient Temperature)*-20C to +53C(Electrical Data)

Supply voltage: DC24V 45mA
Detecting element output signal: DC0.1V 0.2mA
Analog signal output: DC24V 22mA

(Applicable Standard)

JNIOSH-TR-NO. 43(2008)*The ambient temperature on explosion-proof certification is described above and it indicates thetemperature range which can maintain the explosion-proof performance and not the product performance,
see “10. Product specifications” for details.
Installation
Installation Diagram
Hazardous Location(Zone 1)←→

Nonhazardous Location

Gas Detector (SD-1OX)

Indicator etc.
CVVS Cable

24V
GND
Signal ＋
Signal －24V
GND＋ Signal－ Signal-8-3 Product Components

3-1. Main unit and standard accessories

3

Product Components
3-1. Main unit and standard accessories<Main Unit> (including a cable gland or an adapter)【Export Specification】

Display
Adapter(NPT 1/2 )【Japan Specification】

Cable gland (G3/4)-9-

3 Product Components

3-2. Names and functions for each part

<Standard Accessories>Operating manual
Dedicated handling lever (used for the wiring)
Dedicated control key

CAUTION
Use the supplied dedicated control key to operate the detector. If products other than theseaccessories are used, key operations cannot be accepted properly.
Note that the control key is made of extremely strong magnet. Putting it close to a magnetic product,such as a credit card and ID card, may damage the stored data.

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

(6) Alarm lamp

(7) Fault lamp(3) ▲ key(1) MENU/ESC 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.

- 10 -

3 Product Components

3-3. Block diagram

3-3. Block diagram<Electric Diagram>

Power supply part

Display（POWER）（ALARM）（FAULT)POWER INPUT (24 VDC)
Seven-segment LED(four-digit)

Transmission part

Controller(CPU)

Magnetic operation part
(MENU/ESC) (▲) (▼) (SET) 4 – 20 mA transmission
 HART communication

Sensor- 11 -

4 How to Use

4-1. Before using the gas detector

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 theoperating precautions.
Ignoring the precautions may damage the gas detector, resulting in inaccurate gas detection.

4-2. Precautions for installation sites
CAUTION
This is a precision device. Because the detector may not provide the specified performance in someplaces (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 ofthe 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 beinstalled.

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.
<Export Specification> -10 to +40°C<Japan Specification> -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 thetemperature.
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.

- 12 -

4 How to Use

4-3. Precautions for system designing

Do not install the detector in a place where maintenance of the detector cannot be performed or wherehandling 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.

WARNINGAn oxygen detector is affected by pressure. If the detector is used at a pressure other thanatmospheric pressure, a calibration is required under that pressure. The maximum allowablepressure is 110 KPa. The detector cannot be used under reduced pressure. Using the detector at apressure exceeding the allowable range may cause a trouble in the oxygen sensor performance.

4-3. Precautions for system designing
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.

Using a stable power supply
The external output of the detector 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 (uninterruptible power
supply), or take appropriate actions on the receiving side.
The detector must be provided with the following power supply.
Power supply voltage
Allowed time of
momentary blackout
Others24 VDC±10%: Terminal voltage of the detector
Up to 10 milliseconds
Example of actions(To recover from the momentary
To ensure continuous operation andblackout for 10 milliseconds or more,
activation, install a UPS outside therestart the detector.)detector.
Do not use it with a power supply of
Example of actions
large power load or high-frequency
Use a line filter to avoid the noise source
noise.
if necessary.

Introducing protective measures against lightning
If cables are installed outside the factory/plant, or if internal cables are installed in the same duct as thecables coming from outside the factory/plant, "lightning" will cause problems. Because lightning acts as alarge emission source while cables act as a receiving antenna, devices connected to the cables may bedamaged.
Lightning cannot be prevented. Cables installed in a metal conduit or under the ground cannot becompletely protected from inductive lightning surge caused by lightning. Although complete elimination ofdisasters caused by lightning is impossible, the following protective measures can be taken.

- 13 -

4 How to Use

Protection against
lightning

Grounding*

4-4. How to install

Take appropriate measures in accordance with the importance of the facilities and theenvironment.
Provide protection by a lightning arrester (cable arrester).
(Although inductive lightning surge can be transmitted through the cable, it isprevented 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.)
In addition to lightning, there are more sources of surge noise. To protect units fromthese noise sources, the units must be grounded.

The lightning arrester has a circuit to remove a surge voltage which damages field devices, so thatsignals may be attenuated. Before installing a lightning arrester, verify that it works properly.

4-4. How to install<Installation Dimensions and Maintenance Space>

193mm

150mm

The following installation requirements must be met to install the detector.

Attach the detector on the wall and others using four M5 screws.

CAUTION
Do not install the detector in a place where maintenance of the detector cannot be performed orwhere 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 isperformed in its inside, where parts of the machinery must be removed to perform maintenance, orwhere the detector cannot be removed because tubes or racks prevent access to it. Do not installthe detector in a place where maintenance involves dangers, for example, near a high-voltage
cable.

- 14 -

4 How to Use






4-4. How to install

WARNING
Install the detector head in the specified direction.
Installing it in a wrong direction may cause abnormal readings.
Install the detector while giving due consideration to the conditions for the detection area.
Normally, when the detector is used to detect oxygen deficiency, the detector head should beinstalled at a face level.
When there is a risk of oxygen deficiency due to a gas heavier than the air (CO2 etc.), installthe detector in consideration for the specific gravity of the gas.
Do not install the detector in a damp place where condensation occurs. Water drops formed on
the sensor may cause abnormal detection.

Detector head installation direction- 15 -

4 How to Use

4-5. Installation procedure

4-5. Installation procedure<Attaching External Cable>【Export Specification】
The export specification comes with adapter A (NPT 1/2) asstandard. Please prepare the Ex cable gland that is suitable for the adapter.
Adapter A(NPT1/2)【Japan Specification】
Cable gland, Rubber seal, Washer and Eccentric washer are mounted on SD-1OX main body as shown
below.
Attach the parts :Pass a Cable (e.g. CVVS) through the Cable gland, Eccentric washier, Washer, and Rubber seal, anddrawn into detector inside. (For wire methods, see "4-6 How to wire".)Tightens Cable gland, and then tightens hexagon socket set screw (M4×6), and fix cable gland.

Hexagon socket set screw（M4×6）

Rubber seal
WasherDaub screw with grease
Cable gland(G3/4)

Main unit
Rubber seal
Eccentric washer

WasherEccentric washer

Please mind direction ofEccentric washer

Cable（CVVS etc.）

Cable gland(G3/4)

Washer side

Cable gland section view

Cable gland side

WARNING If a scratch, crack or other abnormality is found on the container or explosion-proof structure joint
surface, stop using the detector immediately and contact RIKEN KEIKI.

CAUTION Tighten 40 Nꞏm or larger torque value to ensure the tightening cable gland and seal plug.
 If it is difficult to tighten the cable gland, grease its screw part and then tighten it with tools.

- 16 -

4 How to Use

4-6. How to wire

4-6. How to wire








CAUTIONBe careful not to damage the internal electronic circuit when wiring. In addition, be careful not
to apply stresses on the detector when (overweight) cables are installed.
The power cables and signal cables must not be installed together with the motor power cables
etc. When these cables must be installed together for unavoidable reasons, put the power
cables and signal cables in a metal conduit. The conduit must be connected to a grounding
circuit.
When stranded wires are used, prevent wires from contacting each other.
Use the dedicated handling lever to wire.
Use appropriate cables to wire.

<Recommended Cables>
CVVS 1.25mm2 or 2.0mm2/3-core
CVVS 1.25mm2 or 2.0mm2/4-core

3-wire4-wire<Parts. length table of outside conductor lead-in>
Cable overall outer
diameter(mm)Rubber seal innerdiameter(mm)Washer innerdiameter(mm)From Φ9.6 to less than Φ11.0

Φ11

Φ12

From Φ11.0 to less than Φ11.5

Φ12

Φ12

From Φ11.5 to less than Φ12.0

Φ12

Φ14

From Φ12.0 to less than Φ13.0

Φ13

Φ14

Φ13.0

Φ13.5

Φ14

φ23

- 17 -

4 How to Use

4-6. How to wire

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
2
3
4
5
6

CVV 1.25mm2
ø9.5
ø10.0
ø10.5
ø11.5
ø12.5

CVV 2mm2
ø10.5
ø11.0
ø11.5
ø12.5
ø13.5

CVVS 1.25mm2
ø10.0
ø10.5
ø11.0
ø12.0
ø13.0

CVVS 2mm2
ø11.0
ø11.5
ø12.0
ø13.0
ø14.0

<Figure of Terminal Plate>
24 VDC
4 - 20 mA
+
HART

DC+

1

DC-

2

Sig+

3

Sig-

4

Grounding terminalNOTE
The 2p of terminal plate is being deemed to be
power and the 4-20mA output common (-)
terminal, and using as 3-wire is possible.

<Specifications of Terminal Plate>Specifications of terminal plate
Rated voltage: 250 VAC
Rated current: 12 A
However, it depends on cables to be used.
Connection conditions

Cables: 0.25 - 2.5 mm2
Bare wire length: 8 - 9 mm
Connecting tool: Dedicated handling lever (accessory) or driver (edge 3.5 x 0.5 mm)- 18 -

4 How to Use

4-6. How to wire

CAUTION
The specified bare wire length must be observed when the wire insulation is peeled off.
Improper clamping of the wire due to a shorter bare wire length may cause defective electrification or
heating.
Catching the wire insulation due to a shorter bare wire length may cause defective electrification or
heating.
Exposing the wire due to a longer bare wire length may cause defective insulation or a short circuit.
Be careful not to break up the wire. If the wire is broken up when inserted to the terminal, this may
cause defective insulation or heating.
8 - 9 mm

Compatible bar terminal
For a bar terminal, the following items are available.

Bar terminal (ferrule): Model 216 Series (manufactured by WAGO)

Crimping tool: Model VarioCrimp 4 (206-204) (manufactured by WAGO)

CAUTION
A bar terminal of the specified model must be used. Using other bar terminals invalidates thewarranty of the performance.

<How to Connect to Terminal Plate>
When cables are connected to the connectors, use the dedicated lever or a flathead screwdriver to do it asshown below.

CAUTION
The right tools must be used.
In principle, one wire can be connected to one wiring hole.
When the wire is inserted into the driver slot by mistake, it does not contact the conductive part. Thismay cause defective electric conduction or heating.
When the wire is inserted under the spring by mistake, it does not contact the conductive part. Thismay cause defective electric conduction or heating.

NOTE<How to Use the Dedicated Handling Lever>Push the lever with your finger
to lower the spring in its inside.

While holding down the lever, insert the wire into the(round) wiring hole until it reaches the deepest point.
Once the lever is released, the wire is secured.

To check whether the wire is connected securely, pull the wire gently. (Do not pull the wire strongly.)- 19 -

4 How to Use

4-6. How to wire

<Grounding>Connect the detector to your grounding terminal with the external terminal







.

WARNING
Before turning on the detector, do not forget to connect it to a grounding terminal.
For stable operation of the detector and safety, it must be connected to a grounding terminal.
Do not connect the grounding wire to a gas pipe.
The grounding must be made as D type grounding (below 100 Ω of grounding resistance).
For the grounding wire, use cable lugs to safely connect it to a grounding terminal withoutlooseness or twist.
Use ring terminals to connect the grounding terminal with the ground and use the grounding
wire with cross-sectional area of 4 mm2 or more for the external grounding terminal.

<Wiring Example>
Connecting to the indicator

SD-1OX
1 2 3 4

RM-5003, etc.

+24V
GND
Sig

Connecting to the upper unit (DCS, PLC)

SD-1OX
1 2 3 4

Power supply(24 VDC)

Relay
terminal+-

Upper unit
(DCS, PLC)+

CAUTIONIf HART communication is used, check so that wiring load resistance that constitute 4-20mA loops,
amount to 250 Ω-300 Ω.
- 20 -

5 How to Operate

5-1. Preparation for start-up

5

How to Operate
5-1. Preparation for start-up
Before connecting a power supply, read and understand the following precautions. Ignoring theseprecautions may cause an electric shock or damage the detector.
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.

5-2. Basic operating procedures
Normally, the detection mode is used for normal operations. (The detection mode is activated after the
power is turned on.)●: Lamp on○: Lamp off◎: Lamp<<Detection Mode>>

The detector is restarted
after recovering from fault.

(long pressing)(long pressing)<<User Mode>><<Gas Alarm>>

18.0<<Fault Status>><<Maintenance Mode>>(Regular maintenance)- 21 -

5 How to Operate

5-3. How to start the gas detector

WARNING
When the detector enters other mode from the detection mode while an alarm is activated, the alarmis reset.

5-3. How to start the gas detector

Before supplying power (24 VDC) to the detector, check that the detector is installed properly.
Supply power (24 VDC) to the detector (turn on the detector).
After the detector completes the start-up, it enters the detection mode swiftly.



CAUTION
Do not turn off the detector during the initial clear. The detector is reading the internal memory
during the initial clear.
If the detector is installed newly or the new sensor is replaced, the sensor must be warmed up
for a specified period which is determined depending on the type of the sensor after thedetector is started.
After the warm-up is completed, perform a span adjustment.

NOTE<<Start-up Operation Procedures>> (approximately 25 seconds for system check of the detector and alarmdeactivation)
Power on -> Initial clear (approximately 25 seconds) -> Detection mode

Power On

Initial Clear

Detection Mode

- 22 -

5 How to Operate

5-4. Modes

5-4. Modes
Details on each mode are provided as follows.

CAUTION

Do not change the settings if not necessary. Changing the settings without understanding thespecifications may cause malfunctions.

Mode
Detection Mode

User Mode

Item
-

LED
displayGas
concentr
ation

Details
Normal state

ROM/SUM Display

1-0

Span Adjustment
Setting Display
Switch to
Maintenance Mode

1-1
1-2

Display the program version and others.
This is not typically used by the user.
Perform the span adjustment.
Display various setting values.

1-3

Switch to the regular maintenance mode.

2-0

Perform various tests.
2-0.0 Gas Test
2-0.1 Alarm Test
2-0.2 Fault Test
2-0.3 LED Test
2-0.4 Memory Test

2-1

Perform the zero adjustment(N2 adjustment)t.

2-2

Perform the span adjustment(air adjustment).

2-3

Initialize zero/span values.

Test Mode

Zero Adjustment(N2 adjustment)
Span Adjustment(air adjustment)
Zero/Span
Initialization

Maintenance Mode
(Regularmaintenance)
Environmental
Setting

2-4

Display

2-5

Switch to FactoryMode
Switch to User Mode

Used for various environmental settings.
2-4.0 Sensor Power Supply ON/OFF
2-4.1 INHIBIT Setting
2-4.2 Alarm Setpoint Setting
2-4.3 Alarm Delay Time Setting
2-4.4 Alarm Pattern Setting
2-4.5 Suppression Type Setting
2-4.6 Suppression Value Setting
2-4.7 Not used.
2-4.8 Not used.
2-4.9 Not used.
2-4.A Maintenance Mode External Output
Setting
2-4.B External Output Adjustment
2-4.C Alarm Test External Output Setting
2-4.D Not used.
2-4.E Password Setting
2-4.F Sensor Fault Alarm Pattern Setting
2-4.H Not used.
Display various electrical settings.
This is not typically used by the user.

2-6

Not used.

2-7

Returns to the user mode.

- 23 -

5 How to Operate

5-5. User mode

5-5. User mode
WARNING
After the adjustment is completed, never fail to press MENU/ESC key to return to the detectionmode.
(If the detector remains in the user mode, it automatically returns to the detection mode in ten
hours.)

Detection Mode
Press the MENU/ESC key forthree seconds.

User Mode
1-0. ROM/SUM Display
Display the program version andothers. This is not typically usedby the user.

1-1. Span Adjustment(air adjustment)
Perform the span adjustment.

Span Adjustment(air adjustment)=> P251-2. Various Setting Display
Display various setting values.

Setting Display

1-3. Maintenance Mode Switching
Switch to Regular maintenancemode.

See "Regular maintenancemode".

To 1-0- 24 -=> P26

5 How to Operate

5-5. User mode

<Span Adjustment(Air Adjustment) "1-1">This is used to perform the span adjustment(air adjustment).

1-1
Press SET key.

Current Concentration Value Display
Press the SET key to perform the air
adjustment.

Under Span Adjustment (air adjustment)(CAL. is displayed)
Wait for a while until the adjustment iscompleted.

Span Adjustment (air adjustment)Completed
It automatically returns to 1-1 after PASS isdisplayed.

Return to 1-1.
* If the span adjustment(air adjustment)
failed, it automatically returns to 1-1 after
FAIL is displayed.

Return to 1-1.

NOTE

 If the span adjustment(air adjustment) failed since the span point was significantly fluctuated fromaround 20.9%, it returns to 1-1 after FAIL rather than PASS is displayed. In this case, the span
adjustment(air adjustment) has not been completed.

- 25 -

5 How to Operate

5-6. How to exit

<Setting Display "1-2">
Display various setting values.

1-2.
Press SET key.

Alarm Setpoint Display

Alarm Delay Time Display(seconds)

Zero Suppression Value
Display

To 1-25-6. How to exit
To turn off the detector, turn off the power supply (24 VDC) to the detector.



WARNING
When the detector is turned off, an alarm may be triggered on the upper (central) system.
Before turning off the detector, INHIBIT (point skip) on the upper (central) system must be
activated. Decide whether the power can be turned off by checking the operation of the devices
connected to the external output or external contact output terminal of the detector.

- 26 -

6 Operations and Functions

6-1. Alarm activation

6

Operations and Functions
6-1. Alarm activation
Oxygen concentration alarm: Activated when the detected oxygen concentration reaches or exceeds thealarm 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>
Oxygen 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.

<Alarm Activation>
It lights up when the oxygen concentration reaches or exceeds the alarm setpoint value.
The alarm activation is reset automatically when the gas concentration drops above the alarm setpointvalue.

Concentration

Alarm setpoint

0
Time

Alarm lamp (ALM)
Alarm delay time (2 seconds)- 27 -

6 Operations and Functions

6-2. Fault alarm activation<Response to Alarm>
An oxygen concentration value exceeds the alarm setpoint
When an alarm is triggered, take actions in accordance with your management rules of 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".

- 28 -

6 Operations and Functions

6-3. External output operation

6-3. External output operation
Signal Transmission System
Transmission Path
Transmission DistanceConnection Load Resistance1
Detection Mode(No alarm)2
Detection Mode(Gas alarm)
3
Initial Clear

4

Maintenance Mode

5

Alarm Test Mode

67

Fault Alarm
INHIBIT

8Power OffElectric current transmission (non-isolated) 4 – 20 mA
CVVS
CVVS 1.25mm2: Within 1.25km
Below 300 Ω
4 - 20 mA (concentration output)
4 - 20 mA (concentration output)
Depending on the setting of the section 4.
2.5 mA setting: 2.5 mA
4 mA, HOLD, 4 - 20 mA setting: Air value(17.4 mA)
2.5 mA setting: 2.5 mA
4 mA setting: Air point(17.4 mA)
HOLD setting: The previous value retained
4-20 mA setting: 4 - 20 mA (concentration output)
Output ON setting: 4 - 20 mA (concentration output)
Output OFF setting: The previous value retained
0.5 mA (Fixed)
Depending on the setting of the section 4.
2.5 mA setting: 2.5 mA
4 mA, HOLD, 4 - 20 mA setting: Air value(17.4 mA)
0 mA

Example of Gas Concentration and External Output
0 - 25 vol% (Oxygen deficiency alarm specification)
External output
20.5 mA
20 mA
Detection mode
17.4 mA

Maintenance mode

4 mA

0

Gas concentration
Full scale
Suppression value

CAUTION
The 4 - 20 mA output is already adjusted. In case of over scale, an output will not exceed 22 mA.
Output during INHIBIT or initial clear is based on 4 - 20 mA output setting in the maintenancemode.
In particular, when the detector is started or the specification is changed, be careful about 4-20
mA output setting. Understand how the detector functions, and take actions, if necessary, so thatthe signal receiver side can prepare to avoid false alarms.

- 29 -

6 Operations and Functions

6-4. Other functions

6-4. Other functions<Suppression Function>
The sensors used with the detector are influenced by environmental changes (temperature, humidity andother characteristics) in no small measure, which affects the reading. Therefore, the reading might befluctuated even in a normal environment.
This function obscures influences by environmental changes or other factors that have no meaning for yourmanagement rules of alarm. This function is used to hide (suppress) the fluctuation of the reading under thesetting value, indicating 20.9 vol%.

<<Example>>
Suppression Disabled
A fluctuation around zero is displayed as thereading.

Suppression Enabled
A fluctuation under the setting value is hidden with 20.9
vol%.
(Zero suppression)

NOTE




The suppression function is factory-set. The standard setting value is ±0.5 vol% (for 20.9 vol%).
In the maintenance mode, this function is disabled and the fluctuation of the reading under the setting
value is displayed.

CAUTIONA reading under zero is suppressed with the 10% FS suppression.
A reading that gets 10% FS or more under zero is displayed as "-0.0", which prevents an accurate
gas detection and needs the zero adjustment.

- 30 -

7 Maintenance7-1. Maintenance intervals and items

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

Alarm Test
Span
Adjustment
Gas Alarm
Check

Maintenance content
Check that the power lamp lights up.
Check that the concentration display value
is zero(oxygen monitor:20.9vol%). Whenthe reading is incorrect, perform the zeroadjustment (or span adjustment) after
ensuring that no interference gases exist
around it.
Inspect the alarm circuit by using the alarm
test function.
Perform the span adjustment by using thecalibration gas.
Check the gas alarm by using thecalibration 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.

- 31 -

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.

- 32 -

7 Maintenance7-2. Maintenance Mode(Regular maintenance)

7-2. Maintenance Mode(Regular maintenance)
WARNING
After the adjustment is completed, never fail to press MENU/ESC key to return to the detectionmode.
(If the detector remains in the maintenance mode, it automatically returns to the detection mode inten hours.)

Mode

Item

Test ModeLED
display

Details2-0

Perform various tests.
2-0.0 Gas Test
2-0.1 Alarm Test
2-0.2 Fault Test
2-0.3 LED Test
2-0.4 Memory Test

2-1

Perform the zero adjustment(N2 adjustment).

Zero Adjustment(N2 adjustment)
Span Adjustment(air adjustment)
Zero/Span Initialization

2-2

Perform the span adjustment(air adjustment).

2-3

Environmental Setting

2-4

Display

2-5

Switch to Factory Mode
Switch to User Mode

2-6
2-7

Initialize zero/span values.
Used for various environmental settings.
2-4.0 Sensor Power Supply ON/OFF
2-4.1 INHIBIT Setting
2-4.2 Alarm Setpoint Setting
2-4.3 Alarm Delay Time Setting
2-4.4 Alarm Pattern Setting
2-4.5 Suppression Type Setting
2-4.6 Suppression Value Setting
2-4.7 Not used.
2-4.8 Not used.
2-4.9 Not used.
2-4.A Maintenance Mode External Output Setting
2-4.B External Output Adjustment
2-4.C Alarm Test External Output Setting
2-4.D Not used.
2-4.E Password Setting
2-4.F Sensor Fault Alarm Pattern Setting
2-4.H Not used.
Display various electrical settings.
This is not typically used by the user.
Not used.
Returns to the user mode.

Maintenance
Mode(Regularmaintenance)- 33 -

7 Maintenance7-2. Maintenance Mode(Regular maintenance)
LED

User ModeIn "1-3.", press SET key.

Then press the SET key
again for three seconds.
Maintenance Mode
2-0. Test Mode
Perform various tests.

Test Mode=> P352-1. Zero Adjustment(N2 adjustment)
Perform the zeroadjustment(N2 adjustment).

Zero Adjustment(N2 adjustment)=> P422-2. Span Adjustment(air adjustment)
Perform the span
adjustment.

Span Adjustment(air adjustment)=> P41

2-3. Zero/Span Initialization
Initialize the zero/span
adjustment after the sensor
is replaced.
2-4. Environmental Setting
Set various operations andfunctions.

Environmental
Setting=> P392-4.0 and 2-4.3 to 2-4.H are
factory-set. They are nottypically used by the user.

2-5. Various Electrical
Settings Display
Display various electricalsettings. This is not used by
the user.
2-6.
Enters the factory mode.
This is not used by the user.

2-7.
Returns to the user mode.

rET. is displayed.
Press SET key
again to return tothe user mode.

To 2-0. Test Mode
- 34 -

7 Maintenance7-2. Maintenance Mode(Regular maintenance)<Test Mode "2-0">
LED

2-0
Press SET key.

2-0.0 Gas Test

Gas Test=> P362-0.1 Alarm Test

Alarm Test=> P362-0.2 Fault Test

Fault Test=> P372-0.3 LED Test

LED Test=> P372-0.4 Memory Test

Memory Test=> P38

To 2-0.0

WARNING Before starting the alarm test (transmission test), provide a notification to the related sections sothat they can prepare for false abnormalities (external output signals). After the test is completed,never fail to press MENU/ESC key to return to the detection mode. (If the detector remains in thealarm test mode, it automatically returns to the detection mode in ten hours.)
 In the alarm test mode, the gas concentration equal to the reading is output even in themaintenance mode depending on the setting. Take actions, if necessary, so that the signal
receiver side can prepare to avoid false alarms.

- 35 -

7 Maintenance7-2. Maintenance Mode(Regular maintenance)<Gas Test "2-0.0">

2-0.0
Press SET key.

Introduce the test gas andperform the gas test.

18.0
Perform the gas alarm test byincreasing or decreasing the readingwith  or  key.
Press MENU/ESC key to cancel thetest and to go back to the originalstate.

To 2-0.0

WARNING
Because the contact and gas concentration output can be activated by a gas test even in themaintenance mode depending on setting, be careful to perform the test.

<Alarm Test "2-0.1">
LED

2-0.1
Press SET key.

18.0
Stop introducing the test gas. Whenthe reading drops, press MENU/ESC
key to cancel the test and to go backto the original state.

◎

●

○

To 2-0.1

WARNING
Because the contact and gas concentration output can be activated by an alarm test even in themaintenance mode depending on setting, be careful to perform the test.

- 36 -

7 Maintenance7-2. Maintenance Mode(Regular maintenance)<Fault Test "2-0.2">
LED

2-0.2
Press SET key.

Fault Test ON/OFF
Select either ON/OFF.
Switch ON and press SET key toactivate the fault alarm.
Return to OFF and press SET key todeactivate the fault alarm.
(Pressing MENU/ESC key alsoenables to cancel this menu and to go
back to the original state.)

WARNING
Because the contact and gas concentration output can be activated by a fault test even in themaintenance mode depending on setting, be careful to perform the test.

<LED Test "2-0.3">
LED

2-0.3
Press SET key.

LED Test ON/OFF
Select either ON/OFF.
Switch ON and press SET key to turnon the LED (POWER, ALM, FAULT)
and to display the gas concentrationof 8.8.8.8..
Return to OFF and press SET key todeactivate this menu.
(Pressing MENU/ESC key alsoenables to cancel this menu and to go
back to the original state.)- 37 -

7 Maintenance7-2. Maintenance Mode(Regular maintenance)<Memory Test "2-0.4">
LED

2-0.4
Press SET key.

When StA. is displayed, press SET
key again.

When CAL. is displayed, the memory
diagnosis is performed.

When memory is correct as a result of
the diagnosis, PASS is displayed.
Press SET key to go back to theoriginal state.

To 2-0.4

NOTE
When abnormalities are found in memory as a result of the diagnosis, PASS is not displayed. F-RA isdisplayed for the RAM fault, and F-RO is displayed for the ROM fault. For both the RAM fault and ROM
fault, F-RA and F-RO are displayed alternately.

- 38 -

7 Maintenance7-2. Maintenance Mode(Regular maintenance)<Environmental Setting "2-4">
Set various operations and functions in the environmental setting.
<<Environmental Setting 1>>
2-4. Environmental Setting
Press SET key.

2-4.0
They are factory-set and not
typically used by the user.

2-4.1 INHIBIT Setting
Set Inhibit.
Select either ON/OFF, and thenpress the SET key to confirm theselection.
When ON is selected, in thedetection mode InHI. and 0.0(gas concentration value) aredisplayed on the LED alternately.
As a result, an alarm is not
triggered to external device.

Alarm Setpoint Setting=> P392-4.2 Alarm Setpoint Setting
Set the alarm setpoint.

2-4.3 to 2-4.H
They are factory-set and not
typically used by the user.

To 2-4.0<Alarm Setpoint Setting "2-4.2">

2-4.2
Press SET key.

Alarm Setpoint Setting
Change the value by pressing the▲ or ▼ key, and then press the
SET key to confirm the value.
(Press the MENU/ESC key to go
back to the original state.)

Return to 2-4.2- 39 -

7 Maintenance7-3. Gas calibration method

7-3. Gas calibration method
Perform a gas calibration in each mode (zero adjustment mode and span adjustment mode) using thecalibration gas.
 Zero adjustment gas(more than N2 99.9vol% collected in a gas sampling bag) Span adjustment gas (Air) Gas sampling bags<<SD-1OX>>

Pump

Gas
samplingbag

Needle valve

 OUT

P

Exhaust air

IN↑

Flow meter
Setting：1.5±0.5 L/min- 40 -

Gas calibration adapter

7 Maintenance7-3. Gas calibration method<Span Adjustment (Air Adjustment)"2-2">This is used to perform the span adjustment (air adjustment).

WARNING
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 gas leaks.



CAUTION
Before starting the span adjustment (air adjustment), provide the detector with air and wait until
the reading is stabilized.

2-2
Press SET key.

Air Introduction
Introduce an air, and then press the SET key
when the reading is stabilized.

Span Adjustment (Air Adjustment)
After the reading will flash, adjust the display
value 20.9 by pressing the ▲ or ▼ key.
After adjusting the value, press the SET key.

Span Adjustment Completed
It automatically returns to 2-2 after PASS isdisplayed.

Return to 2-2.
* If the span adjustment(air adjustment)
failed, it automatically returns to 2-2 after
FAIL is displayed.

Return to 2-2.

NOTE

 If the span adjustment failed since the reading was significantly fluctuated from the introduced gas
concentration, it returns to 2-2 after FAIL rather than PASS is displayed. In this case, the span
adjustment has not been completed.
Check if the correct concentration calibration gas has been provided and check the gas adjustment tool
for a gas leak. If there are mistakes, perform the span adjustment again.
If the span adjustment cannot be performed even when there is no mistake or after recalibration, thegas sensor life might have expired. After turning off the power supply, please contact RIKEN KEIKI.

- 41 -

7 Maintenance7-3. Gas calibration method<Zero Adjustment (N2 adjustment) "2-1">
This is used to perform the zero adjustment(N2 adjustment).
When the detector is used to prevent oxygen deficiency, zero adjustment is not required.

NOTE



Before starting the zero adjustment(N2 adjustment), provide the detector with the zero adjustmentgas(more than N2 99.9vol%) and wait until the indicator is stabilized.

2-1
Press SET key.

Zero adjustment gas introduction
Introduce a N2 gas(99.9vol%) for 180
second, and then press the SET key when
the reading is stabilized. Press the SET key
to perform the zero adjustment.
Under Zero Adjustment(N2 adjustment)(CAL. is displayed)
Wait for a while until the adjustment iscompleted.

Zero Adjustment (N2 adjustment)Completed
It automatically returns to 2-1 after PASS isdisplayed.

Return to 2-1.
* If the zero adjustment(N2 adjustment)
failed, it automatically returns to 2-1 after
FAIL is displayed.

Return to 2-1.

NOTE



If the zero adjustment(N2 adjustment) failed since the zero point was significantly fluctuated fromaround 0.0, it returns to 2-1 after FAIL rather than PASS is displayed. In this case, the zeroadjustment(N2 adjustment) has not been completed.

- 42 -

7 Maintenance7-4. Parts replacement

7-4. Parts replacement<Sensor Replacement>Gas sensor replacement is according to the following procedures.
(1) Turn off the power supply (24VDC) to the detector.
(2) After loosened hexagon socket set screw (2 places) by hex wrench (nominal size 2), remove and turning
sensor guard. Make sure that a slip ring is in the sensor guard.
(3) Remove the flame arrester.
(4) Remove the sensor, and mount a new sensor.

Sensor* When put on the sensor, do NOT
scratch mating portion of side of
the sensor and adapter inside.

Hexagon socket set screw(2 places)

Flame arrester

Sensor guard(5) After replacing a sensor, put on a sensor guard and set hexagon socket set screw (2 places) firmly.

Lug※It is efficient that put a lug in front side
and let it.

NOTE・ Rotate to fit the sensor neatly into detector.
(6) After sensor replacement, turn on the power and warm – up, then do the zero - point adjustment andspan adjustment(air adjustment) by [7-3．Calibration method].

NOTE
The gas calibration using the standard gas is required after the sensor is replaced. Please request it to ouroverseas sales department or local representatives.

- 43 -

7 Maintenance7-4. Parts replacement

WARNING Do NOT exchange any parts while turn on electricity. It may happen fire.
 Turn off the power supply, and then replace parts.

<Replacement of Regular Replacement Parts>
Replacement of Slip ring, Rubber seal E and O ring, are according to the following procedures.
(1) After loosened hexagon socket set screw by hex wrench (nominal size 2), rotate the sensor guard, andremove the flame arrester and sensor.
(2) Replace a Slip ring, Rubber seal E and O ring, and then Sensor, Flame arrester and Sensor guard aresequentially mounted. Then, screw up the Sensor guard by Hexagon socket set screw (2 places).

O ring (for guard)

O ring (for sensor)
SensorSensor guard

Rubber seal E
Flame arrester
Slip ring
Hexagon socket set screw(2 places)

List of recommended regular replacement parts*

Maintenanceintervals

Replacement
intervals (year)

Quantity(pieces/unit)

O ring (for guard)

6 months

3 - 8 years

1

2

O ring (for sensor)

6 months

3 - 8 years

1

3

Rubber seal E

6 months

3 - 8 years

1

4

Slip ring

6 months

3 - 8 years

1

No.

Item

1

The operation must be checked after replacement by a qualified service engineer. For the stable
operation of the unit and safety, ask a qualified service engineer to take care of replacement of theparts that operation must be checked. Request RIKEN KEIKI for operation check.

NOTE

 The above replacement intervals are recommendation only. The intervals may change dependingon the operating conditions. These intervals do not mean the warranty periods either. The result of
the regular maintenance may determine when to replace the parts.

- 44 -

8 Storage, Relocation and Disposal

8-1. Procedures to store the gas detector or leave it for a long time

8

Storage, Relocation and
Disposal
8-1. Procedures to store the gas detector or leave it fora long time
The gas detector must be stored under the following environmental conditions.

In a dark place under the normal temperature and humidity away from direct sunlightIn a place where gases, solvents or vapors are not present

8-2. Procedures to relocate the detector or use it again
When the detector is relocated, select a new place in accordance with "4-2. Precautions for installationsites" and "4-4. How to install".
For information on wiring, see "4-5. How to wire". The unpowered time must be minimized when thedetector is relocated.



CAUTION
When using a relocated or stopped/stored detector again, never fail to perform a calibration.
For information on readjustment including a calibration, please contact RIKEN KEIKI.

8-3. Disposal of products
When the detector is disposed of, it must be treated properly as an industrial waste in accordance with thelocal regulations.

- 45 -

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

FAULT

―

―

Sensorabnormalities
E-1●

Systemabnormalities
E-9●

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.
Faults of the sensor
The rated voltage is not
supplied to the detector.
Abnormalities of ROM,
RAM or EEPROM insideof the detector- 46 -

Check if the cable is securely fastened to theterminal plate.
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.

9 Troubleshooting<Abnormalities of Readings>
Symptoms

The reading rises (drops)
and it remains so.

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

Slow response
Span adjustment
impossible

CausesDrifting of sensor
outputActions
Perform the zero adjustment (or span adjustment).

Slow leakA 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.

Environmental
changes

Perform the zero adjustment (or span adjustment).

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.
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- 47 -

10 Product Specifications

10-1. List of specifications

10

Product Specifications
10-1. List of specifications【SD-1OX(TYPE H)】<ATEX/IECEx/UKEX・Oxygen Deficiency Alarm Specification>
Detection principle
Detectable gas
Gas concentration display
Measuring range
Detection method
Alarm preset point
Power indication
Indicate accuracy*1

Galvanic cell method
O2
LED(4digits・7segments)
0～25vol%
Diffusion method
18vol%(L)【Standard】
POWER lamp lighting(green)
Within ±0.7vol%(under an identical condition)

Response time*1

Within 30sec(T90)(under an identical condition)

Alarm accuracy*1Less than ±1vol%(against alarm preset point)(under an identical condition)

Alarm-delay time*1(under an identical condition)

Gas alarm typeGas alarm indication
Gas alarm action
Trouble alarm･Self diagnosis
Trouble alarm indication
Trouble alarm action
Transmission scheme
Specification ofTransmission
Communication scheme
Transmission cable
Transmission distance
Various functions
Power supply
Power consumption
Cabling port

Initial clear
Operating temperature
Operating humidity
Structure
Explosion-proof structure
Explosion-proof grade
Outer dimension
WeightBy anoxia alarm(Alarm preset point:18vol%), Less than 5sec.
(When introducing 10～11vol% gas)(Without piping delay time and communication
delay time.)
Single alarm(L)ALM lamp lighting(red)Auto-recover
System failure(E-9)/Sensor failure(E-1)/Out of operating temperature range(E-27)
FAULT lamp lighting(yellow)/content display
Auto-recoverThree-wire analog transmission(in common with power supply<power supply, signal,common>) or Two-wire analog transmission
DC4～20mA(linear・load resistance less than 300Ω・resolution ability 200division)
HART 7CVVS worth of shield cable(1.25mm2)･3-core or 4-core
CVVS worth of shield cable(2.0mm2)･3-core or 4-coreLess than 1.25km in case of CVVS 1.25mm2
Less than 2.0km in case of CVVS 2.0mm2
Alarm delay/Suppress
DC24V±10%MAX.1.1W
Flame proof packing method<G3/4>(Compatible cables φ9.6～10.5mm in outer diameter and rubber sealsφ11mm in
inner diameter<mounted>)(Compatible cables φ11.5～12.5mm in outer diameter and rubber sealsφ13mm in
inner diameter<accessory)or Adapter A<NPT1/2> or Adapter B<NPT3/4>
Approx.25sec-10～+40℃(non-rapidly-vary)Less than 95%RH(non-condensing)
Wall mounting type
Flame proof structure
Ⅱ2G Ex db ⅡC T6 Gb(ATEX/UKEX) / Ex db ⅡC T6 Gb(IECEx)
Approx.148(W)×208(H)×88(D)mm(projection excluding)Approx.2.5kg- 48 -

10 Product Specifications
Color

10-1. List of specifications
Munsell 7.5BG5/2*1 In conformity to JIS T8201 2010(Oxygen deficiency indicator).

Outline Drawings

Cable gland (G3/4)- 49 -

10 Product Specifications

10-1. List of specifications【SD-1OX(TYPE H)】<Japan Ex・Oxygen Deficiency Alarm Specification>
Detection principle
Detectable gas
Gas concentration display
Measuring range
Detection method
Alarm preset point
Power indication
Indicate accuracy*1

Galvanic cell method
O2
LED(4digits・7segments)
0～25vol%
Diffusion method
18vol%(L)【Standard】
POWER lamp lighting(green)
Within ±0.7vol%(under an identical condition)

Response time*1

Within 30sec(T90)(under an identical condition)

Alarm accuracy*1Less than ±1vol%(against alarm preset point)(under an identical condition)

Alarm-delay time*1(under an identical condition)

Gas alarm typeGas alarm indication
Gas alarm action
Trouble alarm･Self diagnosis
Trouble alarm indication
Trouble alarm action
Transmission scheme
Specification ofTransmission
Communication scheme
Transmission cable
Transmission distance
Various functions
Power supply
Power consumption
Cabling port

Initial clear
Operating temperature
Operating humidity
Structure
Explosion-proof structure
Explosion-proof grade
Outer dimension
WeightColor

By anoxia alarm(Alarm preset point:18vol%), Less than 5sec.
(When introducing 10～11vol% gas)(Without piping delay time and communication
delay time.)
Single alarm(L)ALM lamp lighting(red)Auto-recover
System failure/Sensor failure
FAULT lamp lighting(yellow)/content display
Auto-recoverThree-wire analog transmission(in common with power supply<power supply, signal,common>) or Two-wire analog transmission
DC4～20mA(linear・load resistance less than 300Ω・resolution ability 200division)
HART 7CVVS worth of shield cable(1.25mm2)･3-core or 4-core
CVVS worth of shield cable(2.0mm2)･3-core or 4-coreLess than 1.25km in case of CVVS 1.25mm2
Less than 2.0km in case of CVVS 2.0mm2
Alarm delay/Suppress/HART communication
DC24V±10%MAX.1.1W
Flame proof packing method<G3/4>(Compatible cables φ9.6～10.5mm in outer diameter and rubber sealsφ11mm in
inner diameter<mounted>)(Compatible cables φ11.5～12.5mm in outer diameter and rubber sealsφ13mm in
inner diameter<accessory)
Approx.25sec-10～+40℃(non-rapidly-vary)Less than 95%RH(non-condensing)
Wall mounting type
Flame proof structure
Ex dⅡC T6 X
Approx.148(W)×208(H)×88(D)mm(projection excluding)Approx.2.5kg
Munsell 7.5BG5/2*1 In conformity to JIS T8201 2010(Oxygen deficiency indicator).

- 50 -

10 Product Specifications

10-2. List of accessories

Outline Drawings

Adapter A (NPT1/2)

NOTE
For information on other specifications such as leak alarm specifications, please contact RIKEN KEIKI.

10-2. List of accessoriesOperating manual ･･･････････
Safety manual ･･･････････・・・
Dedicated handling lever ･･･
Dedicated control key ･･････

one
one
one
The supplied quantity depends on the number of units to bedelivered.
1 to 10 units
11 to 20 units
21 to 50 units
Over 51 units- 51 -

One
Two
Three
Four

10 Product Specifications

10-3. Detection principle

10-3. Detection principle[Detection principle]
A negative electrode of noble metal and a positive electrode of lead are placed in a resin container filled withelectrolyte. A part of the container is opened and covered with a barrier. The negative electrode is installedin contact with the barrier. Lead wires are drawn from the positive and negative electrodes to obtain outputs.
A thermistor is connected between the lead wires to perform temperature compensation for the sensor
outputs.
Barrier
Negative
electrode

Electrolyte

Positive
electrodeContainer
Lead wire

Thermistor

Output- 52 -

11 Definition of Terms

11

Definition of Terms
Galvanic cell typevol%Atmosphere
Initial clear
Full scale
Calibration
Zero suppression
Alarm delay time
INHIBIT
HART
communication

This is a principle of the sensor installed in the detector head.
See "10-3. Detection principle" for details.
A unit used to express the percentage of a specific substance (or gas) in a volume ofsolution.
An atmosphere with a temperature within the range of -10 to 40°C and a humidity of
95% RH or less at one atmospheric pressure (1013 hPa).
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.
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.
DC4-20mA signal digitals signalling is superimposed, and is methods that transmit
multiple signals.

- 53 -

Revision History
Issue

Revision details

Issue date

0First issue

12/5/2016

1

Declaration of Conformity

12/23/2019

2

Declaration of Conformity

4/1/2020

3

Safety information, Declaration of Conformity

8/1/2020

4

Safety information, Declaration of Conformity

8/21/2020

5

Sensor Replacement

9/30/2020

6

Declaration of Conformity

11/12/2021

7

UKEX added, CE Declaration of Conformity changed, UKCA Declaration ofConformity added

10/12/2023