PT2E-17911

Smart Transmitter/Gas Detector Head

SD-1DOX
Operating Manual(PT2E-179)(PT2-179)

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. This is a safety unit, not a control unit.
The alarm contact output of the detector must be used for an external alarm lamp/buzzer, while theanalog signal output must be used for an indicator or external recorder.
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.

1 Outline of the Product1-1. Preface<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 ................................................ 3
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 ..................................................................................................................... 16
4-5. Installation procedure ........................................................................................................ 18
4-6. How to wire ....................................................................................................................... 20
4-7. How to tube ....................................................................................................................... 24
5 How to Operate ..................................................................................................................... 25
5-1. Preparation for start-up ..................................................................................................... 25
5-2. Basic operating procedures............................................................................................... 25
5-3. How to start the gas detector ............................................................................................ 26
5-4. Modes ............................................................................................................................... 28
5-5. Maintenance Mode(User) .................................................................................................. 29
5-6. How to exit ........................................................................................................................ 31
6 Operations and Functions ..................................................................................................... 32
6-1. Alarm activation ................................................................................................................. 32
6-2. Fault alarm activation ........................................................................................................ 33
6-3. External output operation .................................................................................................. 34
6-4. Other functions .................................................................................................................. 35
7 Maintenance .......................................................................................................................... 36
7-1. Maintenance intervals and items ....................................................................................... 36
7-2. Maintenance mode(Regular maintenance) ....................................................................... 38
7-3. Calibration method ............................................................................................................ 45
7-4. Replacement parts ............................................................................................................ 48
8 Storage, Relocation and Disposal ......................................................................................... 49
8-1. Procedures to store the gas detector or leave it for a long time ........................................ 49
8-2. Procedures to relocate the detector or use it again ........................................................... 49
8-3. Disposal of products .......................................................................................................... 49
9 Troubleshooting ..................................................................................................................... 50
10 Product Specifications ......................................................................................................... 52
10-1. List of specifications ........................................................................................................ 52
10-2. Detection principle ........................................................................................................... 60
11 Definition of Terms ............................................................................................................... 61-1-

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-1DOX. 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 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.
This manual provides explanation using O2 specification (detection range from 0 to 25vol%) as examples(such as examples of LED display).
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 is a safety unit, not an analyzer or densitometer which performs quantitative/qualitative
analysis/measurement for gases. Please fully understand the features of the detector before using it,so that it can be used properly.
The detector detects abnormalities 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.
An external pump etc. outside the detector introduces gas to perform gas detection.
The detector has a built-in alarm contact and can be used either as a gas alarm, fault alarm or common(gas, fault) alarm.
The detector outputs gas concentration in 4 – 20 mA.

-2-

1 Outline of the Product1-3. Definition of DANGER, WARNING, CAUTION and NOTE

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.

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.
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 thedetector. 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 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.
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 andcorrodes 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 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-1DOX.
The Model SD-1DOX 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.
There is one point of contact and works by gas warning or trouble or both by setting.
<ATEX/IECEx/UKEX Specification>
Technical Data
(Protection Method)(Certificate Numbers)

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±10% 45mA
Output signal (4 to 20 mA): DC24V 22mA
Relay (Contact output): DC30V or AC250V 0.5A
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-179(Group)(Category)(Type of Protection and Marking code)(Equipment Protection Level)(Ambient Temperature)*(Electrical Data)(Applicable Standard)(Manual Number)* 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 “10-1. List of specifications” for details.
Installation

Installation Diagram
Hazardous Location(Zone 1)

Nonhazardous Location

Gas Detector (SD‐1DOX)

Indicator etc.
24V

24V

GND

GND
Sig+

Sig+
RLY

CVVS Cable

-7-

RLY

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±10% 45mA
Detecting element output signal: DC0.1V 0.2mA
Analog signal output: DC24V 22mA
Contact output (Contact capacity): AC250V 0.5A (Load resistance)
DC30V 0.5A (Load resistance)(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 “10-1. List of specifications” for details.
Installation
Installation Diagram
Hazardous Location(Zone 1)

Nonhazardous Location

Gas Detector (SD‐1DOX)

Indicator etc.
24V

24V

GND

GND
Sig+

Sig+
RLY

CVVS Cable

-8-

RLY

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】

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･･････････････････ one
Dedicated handling lever (used for the wiring) ･･････････････････ one
Dedicated control key････････ The supplied quantity depends on the number of units to be delivered.
1 to 10 unitsone
11 to 20 units
two
21 to 50 units
threeover 51 units
four

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
POWER INPUT (24 VDC)
Display（POWER）（ALARM）（FAULT)

Alarm contact controller

Controller(CPU)

1. Gas alarm contact (ALARM)
or
2. Fault contact (FAULT)
or
3. Select either gas alarm orcontact (ALARM/FAULT)

Seven-segment LED(four-digit)
Magnetic operation part
(MENU/ESC) (▲) (▼) (SET)Contact activation
 De-energized (De-energized
at a normal state) ON-ALARM (Closed contact
at an alarm state)
SensorTransmitter 4 – 20 mA transmission- 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 and alarm contact of the detector may be activated when the power is turned on, whenmomentary 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*

4-3. Precautions for system designing

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.

Proper use of alarm contact
The alarm contact of the detector is used to transmit signals to activate an external buzzer, alarm lamp or
rotating lamp. Do not use the detector for controlling purpose (e.g., controlling the shutdown valve).
The specifications for the alarm contact of the detector are based on the resistance load conditions. If
inductive load is used at the alarm contact, the following errors will occur easily because counterelectromotive force is generated at the contact.
Deposition, defective insulation or defective contact at the relay contact
Damage of any electric parts due to high-voltage generated inside the detector
Abnormal operations by an out-of-control CPU

CAUTION
In principle, do not activate inductive load at the alarm contact of the detector. (In particular,
never use the inductive load to activate a fluorescent lamp or motor.)
If inductive load is activated, relay it with an external relay (contact amplification). However,
because the coil of an external relay also involves inductive load, select a relay at a lower
voltage (100 VAC or below), and then protect the contact of the detector with an appropriate
surge absorbing part, such as a CR circuit.

If load is to be activated, appropriate measures must be taken to stabilize the operation of the detector andprotect the alarm contact referring to the following information.

Relay it with an external relay at a lower voltage of 100 VAC or below (contact amplification). At thesame time, the surge absorbing part SK1 suitable for the specifications must be attached to theexternal relay.
In addition, the surge absorbing part SK2 must be attached to the loaded side of the external relay ifnecessary.
It may be recommended that the surge absorbing part should be attached to the contact for certain
load conditions. It must be attached to an appropriate position by checking how the load is
activated.

- 14 -

4 How to Use

4-3. Precautions for system designing

SD-1DOX

Load

Coil

Alarm contact

PowersupplyPowersupplyExternal relay(low voltage relay)- 15 -* SK1, SK2: Surge absorbing parts

4 How to Use

4-4. How to install

4-4. How to install
150mm

193mm

<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 M5 screws.
Tighten the hexagon socket head cap bolt fixing the lid and the main body with a tightening torqueof 215.6±24.5N･cm.

When closing the lid of the detector, make sure that there is no dust on screw, surfaces of the main
body and lid. Then apply grease as specified by RIKEN KEIKI.

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.



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.

- 16 -

4 How to Use

4-4. How to install

Detector head installation direction

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- 17 -

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-1DOX 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".) When installing the cable gland,
make sure that there is no dust in cable gland mounting part, hexagon socket set screw, grounding screw,
and the cable gland. Then apply grease specified by RIKEN KEIKI.
Tightens Cable gland, and then tightens hexagon socket set screw (M4×6), and fix cable gland.

Grounding screw
Hexagon socket set screw（M4×6）
Rubber seal
WasherDaub screw with grease
Cable gland(G3/4)

Main unit
Rubber seal
WasherEccentric washer

Please mind direction ofEccentric washer

Eccentric washer
Cable（CVVS etc.）

Cable gland(G3/4)

Washer side

Cable gland section view
Cable gland side- 18 -

4 How to Use

4-5. Installation procedure

WARNING 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.

CAUTION Tighten 40 Nꞏm or larger torque value to ensure the tightening cable gland and seal plug.
 Tighten the hexagon socket head cap screws fixing the cable gland with a tightening torque of
107.8±12.7N･m.

NOTE・Our company-specified grease : 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- 19 -

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>
3-wire (when the contact is not used)
5-wire (when the contact is used)

CVVS1.25 mm2 or 2.0 mm2- 3-core
CVVS1.25 mm2 or 2.0 mm2 -5-core<Parts. length table of outside conductor lead-in>(Japan Specification)
Cable overall outer
diameter(mm)Rubber seal innerdiameter(mm)Washer innerdiameter(mm)Clamp innerdiameter(mm)From Φ9.6 to less than Φ10.5

Φ11

Φ12

Φ10.8

From Φ10.5 to less than Φ11.5

Φ12

Φ12

Φ11.8

From Φ11.5 to less than Φ12.5

Φ13

Φ14

Φ12.8

From Φ12.5 to less than Φ13.0

Φ13.5

Φ14

Φ13.8

φ23

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

CVV 2 mm2
ø10.5
ø11.0
ø11.5
ø12.5
ø13.5
- 20 -CVVS 1.25 mm2
ø10.0
ø10.5
ø11.0
ø12.0
ø13.0

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

4 How to Use

4-6. How to wire

When the four hexagon socket head bolts of the gas detector head "SD-1DOX" are loosened and the lid isopened, the following terminal plate appears. Grounding terminals
other one outside.

are provided: one inside and the<Figure of Terminal Plate>

24 VDC

4 - 20 mA

DC+

1- (Common)

2

Sig+

3

Contact

4

Contact

5

Grounding terminal<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)<When 4-20mA output is not used>
This detector has a self-diagnosis function which shows E-9 on LED display when 4-20mA is not properly
outputted.
If 4-20mA output is not necessary, connect the following fixed resistance (lead type) to the terminal 2 and 3(”Sig+” and “-(common)”).
Resistance value : 100-300Ω

Rated power : 0.25W or more

Insert a cable and the above resistance together into Terminal 2 (common), and insert lead part of theresistance into terminal 3 (Sig+). After that, check the immovability.

- 21 -

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 electric
conduction or heating.
Catching the wire insulation due to a shorter bare wire length may cause defective electric
conduction 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 yourfinger to lower the springin its inside.

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

To check whether the wire is connected securely, pull the wire gently. (Do not pull the wire strongly.)- 22 -

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-1DOX
1 2 3 4 5
RM-5003 etc.
+24 V
GND
Sig

Connecting to the upper unit (DCS, PLC)

SD-1DOX
1 2 3 4 5Power supply(24 VDC)

Relay terminal plate+－

Upper unit
(DCS, PLC)－+

- 23 -

4 How to Use

4-7. How to tube

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 isnormally attached. Because their material varies depending on the gas to be used, please specify theappropriate unions.
The compatible tube is a tube of Φ6 (OD) - Φ4 (ID). The tube must be installed with the supplied inners andsleeves 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 diameterof 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>).

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, GASOUT) 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.

CAUTION The longer the tube of the GAS IN is, the longer it takes for a gas to reach the detector. Becausesome gases have a highly adsorptive property for the tube, resulting in a slow response and alower 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 thegas 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.

- 24 -

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.

Because the external contact may be activated during the adjustment, take measures to prevent anactivated contact from having influences on external device.
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
Normally, the detection mode is used for normal operations. (The detection mode is activated after the
power is turned on.)- 25 -

5 How to Operate

5-3. How to start the gas detector●: Lamp on○: Lamp off◎: Lamp<<Detection Mode>>

The detector is restarted
after recovering from fault.

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

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

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 (AIR 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

- 26 -

5 How to Operate

5-3. How to start the gas detector

Power On

Initial Clear

Detection Mode

- 27 -

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

Item

Detection Mode

ROM/SUM Display

Maintenance Mode
(User)

Span Adjustment(AIR adjustment)
Setting Display
Switch to
Maintenance Mode

Test Mode

Zero Adjustment(N2 adjustment)
Span Adjustment(AIR adjustment)
Zero/Span
InitializationLED
displayGas
concentr
ation

Normal state

1-0

Display the program version and others.
This is not typically used by the user.

1-1

Perform the span adjustment (AIR adjustment).

1-2

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).

2-2

Perform the span adjustment (AIR adjustment).

2-3

Initialize zero/span values.

Maintenance Mode
(Regularmaintenance)
Environmental
Setting

2-4

Display

2-5

Switch to FactoryMode
Switch to User Mode

Details

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 Alarm Contact Specification Setting
2-4.8 Energized/De-energized Contact Setting
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
Display various electrical settings.
This is not typically used by the user.

2-6

Not used.

2-7

Returns to the user mode.

- 28 -

5 How to Operate

5-5. Maintenance Mode(User)

5-5. Maintenance Mode(User)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)=> P301-2. Various Setting Display
Display various setting values.

Setting Display

1-3. Mode Switching
Switch to the maintenance mode.

See "Maintenance mode
(regular maintenance)".
=> P38

To 1-0- 29 -=> P31

5 How to Operate

5-5. Maintenance Mode(User)<Span Adjustment (AIR adjustment)"1-1">This is used to perform the zero adjustment (AIR adjustment).

1-1
Press SET key.

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

21.2

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.

20.9

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.

- 30 -

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

Alarm Contact Specification
DisplayAL.
FAU.
A. or F.

: The contact is activated due to thegas alarm.
: The contact is activated due to thefault alarm.
: The contact is activated due to thegas alarm or the fault alarm.

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.
If the alarm contact is energized (option), it is activated when the detector is turned "OFF".

- 31 -

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.

<Contact Activation>
The contact is activated when the oxygen concentration reaches or exceeds the alarm setpoint value (onlywhen the alarm is used).
The contact activation is reset automatically when the gas concentration drops below the alarm setpointvalue.

Concentration

Alarm setpoint

0
Time

Alarm lamp (ALM)
Alarm contact (terminal plate 4, 5)

Alarm delay time (2 seconds)- 32 -

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".

- 33 -

6 Operations and Functions

6-3. External output operation

6-3. External output operation
0 - 25 vol% (Oxygen deficiency alarm specification)
Signal Transmission System
Electric current transmission (non-isolated) 4 – 20 mA
Transmission Path
CVVS equivalentTransmission Distance
CVVS equivalent 1.25 mm2 : Maximum 1.25 km
CVVS equivalent 2.0 mm2 : Maximum 2.0 km
Connection Load Resistance
Below 300 Ω
1 Detection Mode(No Alarm)
4 - 20 mA (concentration output)
2 Detection Mode(Gas Alarm)
4 - 20 mA (concentration output)
3 Initial Clear
Depending on the setting of section 4.
2.5 mA setting: 2.5 mA
4 mA, HOLD, 4 - 20 mA setting: Equivalent to AIR value (17.4 mA)
4 Maintenance Mode
2.5 mA setting: 2.5 mA
4 mA setting: Equivalent to AIR value (17.4 mA)
HOLD setting: The previous value retained
4 - 20 mA setting: 4 - 20 mA (concentration output)
5 Alarm Test
Output ON setting: 4 - 20 mA (concentration output)
Output OFF setting: The previous value retained
6 Fault Alarm
0.5 mA (Fixed)
7 INHIBIT
Depending on the setting of section 4.
2.5 mA setting: 2.5 mA
4 mA, HOLD, 4 - 20 mA setting: Equivalent to AIR value (17.4 mA)
8 Power Off
0 mA
Example of Gas Concentration and External Output
0 - 25 vol% (Oxygen deficiency alarm specification)
External output
22 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, sothat the signal receiver side can prepare to avoid false alarms.

- 34 -

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 20.9% 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(<User> or <Regular maintenance>), this function is disabled and thefluctuation 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.

- 35 -

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

Flow rate
check
Filter 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 (or20.9 vol% on the oxygen meter). When the reading isincorrect, perform the zero adjustment (or span
adjustment) after ensuring that no interference gases
exist around it.
Check the flow rate to find abnormalities.
Check the dust filter for dust or clogging.
Inspect the alarm circuit by using the alarm test function.
Perform the span adjustment by using the calibration
gas.
Check the gas alarm by using the calibration 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.

- 36 -

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.

- 37 -

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 regular maintenance mode, it automatically returns to the detection
mode in ten hours.)
Mode

Item

LED
display

Details

Test 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

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

2-1

Perform the zero adjustment (N2 adjustment).

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 Alarm Contact Specification Setting
2-4.8 Energized/De-energized Contact Setting
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
Display various electrical settings.
This is not typically used by the user.
Not used.
Returns to the user mode.

Maintenance
Mode(Regularmaintenance)

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

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

Test Mode=> P40- 38 -

7 Maintenance7-2. Maintenance mode(Regular maintenance)

2-1. Zero Adjustment(N2 adjustment)
Perform the zero adjustment(N2 adjustment).

Zero Adjustment(N2 adjustment)=> P472-2. Span Adjustment(AIR adjustment)
Perform the span adjustment(AIR adjustment).

Span Adjustment(AIR adjustment)=> P452-3. Zero/Span Initialization
Initialize the zero/span
adjustment after the sensor is
replaced.
2-4. Environmental Setting
Set various operations andfunctions.

Environmental Setting=> P44"2-4.0" and "2-4.3" to "2-4.F" arefactory-set. They are not typicallyused by the user.

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

rET. is displayed. Press the
SET key again to return to theuser mode.

2-7.
Return to the user mode.

To 2-0. Test Mode

- 39 -

7 Maintenance7-2. Maintenance mode(Regular maintenance)<Test Mode "2-0">
2-0
Press SET key.

Gas Test

2-0.0 Gas Test=> P41

Alarm Test=> P41

Fault Test=> P422-0.3 LED Test

LED Test=> P422-0.4 Memory Test

Memory Test

2-0.1 Alarm Test

2-0.2 Fault Test=> P43To 2-0.0

WARNING
Before starting the alarm test (transmission test), provide a notification to the related sections
so that they can prepare for false abnormalities (external output signals and alarm contact).
After the test is completed, never fail to press MENU/ESC key to return to the detection mode.
(If the detector remains in the alarm test mode, it automatically returns to the detection mode inten 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.

- 40 -

7 Maintenance7-2. Maintenance mode(Regular maintenance)<Gas Test "2-0.0">
2-0.0
Press SET key.

Introduce the test gas and perform the gas
test.

18.0
Stop introducing the test gas. When thereading increases, press the MENU/ESC key
to cancel the test and to go back to theoriginal state.
To 2-0.0

WARNINGBe careful to perform the test because the contact and gas concentration output can be activated bya gas test even in the maintenance mode depending on setting.

<Alarm Test "2-0.1">
2-0.1
Press SET key.

Alarm Test ON/OFF(The contact setting is "Alarm" or "Alarm or
Fault")
Select either ON/OFF, and then press the
SET key.

18.0
Perform the gas alarm test by increasing or
decreasing the reading with the ▲ or ▼ key.
Press the MENU/ESC key to cancel the test
and to go back to the original state.
To 2-0.1

WARNINGBe careful to perform the test because the contact and gas concentration output can be activated byan alarm test even in the maintenance mode depending on setting.
- 41 -

7 Maintenance7-2. Maintenance mode(Regular maintenance)<Fault Test "2-0.2">
2-0.2
Press SET key.

Fault Test ON/OFF
Select either ON/OFF.
Switch ON and press the SET key to trigger
the fault alarm.
Return to OFF and press the SET key tocancel the test.
(Pressing the MENU/ESC key also enables
to cancel the test and to go back to theoriginal state.)

WARNINGBe careful to perform the test because the contact and gas concentration output can be activated bya fault test even in the maintenance mode depending on setting.

<LED Test "2-0.3">
2-0.3
Press SET key.

LED Test ON/OFF
Select either ON/OFF.
Switch ON and press the SET key to turn on
the LEDs (POWER, ALM, FAULT) and to
display the gas concentration of 8.8.8.8.
Return to OFF and press the SET key tocancel the test.
(Pressing the MENU/ESC key also enables
to cancel the test and to go back to theoriginal state.)- 42 -

7 Maintenance7-2. Maintenance mode(Regular maintenance)<Memory Test "2-0.4">
2-0.4
Press SET key.

When StA. is displayed, press the SET key
again.

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

When memory is correct as a result of thediagnosis, PASS is displayed. Press the SET
key to go back to the original 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.

- 43 -

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.

2-4.2 Alarm Setpoint Setting
Set the alarm setpoint.

Alarm Setpoint Setting=> P432-4.3 to 2-4.F
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- 44 -

7 Maintenance7-3. Calibration method

7-3. Calibration method
Perform a calibration in each mode (zeroadjustment mode and span adjustment mode)using the calibration gas.

Zero adjustment gas (more than N2 99.9%
collected in a gas sampling bag)Calibration gas (Air)
Gas sampling bags

<SD-1DOX>

Flow meter
Pump
Gas
samplingbag-> OUTP
Needle valve

Exhaust air

IN↑
Calibration adapter<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 the calibration
gas and wait until the reading is stabilized.

- 45 -

7 Maintenance7-3. Calibration method

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 (AIR 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 (AIR adjustment) failed since the reading was significantly fluctuated from theintroduced gas concentration, it returns to 2-2 after FAIL rather than PASS is displayed. In this case, thespan adjustment (AIR 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 (AIR adjustment) again.
If the span adjustment (AIR adjustment) cannot be performed even when there is no mistake or afterrecalibration, the gas sensor life might have expired. After turning off the power supply, please contact
RIKEN KEIKI.

- 46 -

7 Maintenance7-3. 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 adjustment(more than N2 99.9vol%) gas 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.

- 47 -

7 Maintenance7-4. Replacement parts

7-4. Replacement parts<Sensor Replacement>
Our service engineers need to replace the sensor and perform the calibration.
Please contact RIKEN KEIKI.

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

<Replacement of Regular Replacement Parts>
List of recommended regular replacement parts

*

No.

Name

1

Rubber seal E (for the sensor)
O ring (for the sensor/guard)
Rubber seal (for the suction cap)

Maintenanceintervals

Replacement
intervals (year)

Quantity(pieces/unit)

1 year3 - 6 years

Each 1The 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 depending on
the operating conditions. These intervals do not mean the warranty periods either. The result of theregular maintenance may determine when to replace the parts.

- 48 -

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
for a 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 "4-6. 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.

- 49 -

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
Sensorabnormalities
E-1

Systemabnormalities
E-9

FAULT

―

―

●

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

Replace the sensor with a new one.
Check the power supply, and supply the rated
voltage.

External output 4-20mA
is not properly outputted

Check if the cable for external output iscorrectly connected. (Deterioration of the cable,
connection of the host system, etc).
If the output is not necessary, connect a
resistance to the terminal as mentioned in P19.
If it is correctly connected, contact our overseas
sales department or local agents because afailure inside this detector might be occurred.

●- 50 -

Check if the cable is securely fastened to theterminal plate.

Please contact our overseas sales department
or local representatives.

9 Troubleshooting

8-3. Disposal of products<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.
Clogged dust filter
Replace the dust filter.
Bended, clogged,or leaked suction
Fix the defective parts.
tube or exhausttube
Condensation isformed inside theFix the defective parts.
suction tube.
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- 51 -

10 Product Specifications

10-1. List of specifications

10

Product Specifications
10-1. List of specifications<ATEX/IECEx/UKEX・Oxygen Deficiency Alarm Specification>
Model
Detection principle
Detection gas
Concentration display
Detection range
Detection method
Suction flow
Alarm setpoints
Power display
External output
Indicate accuracy*1(under an identical condition)
Accuracy of Alarm setpoint*1
Response time*1(under an identical condition)
Alarm-delay time*1(under an identical condition)
Gas alarm typeGas alarm display
Gas alarm patternFault alarm・Self diagnosis
Fault alarm display
Fault alarm pattern
Alarm contact
Contact capacity
Transmission scheme
Transmission specification
Transmission cable
Transmission distancePower supply
FunctionsPower consumption
Cabling port

SD-1DOX
Galvanic cell method
O2
LED(4digits・7segments)
0 - 25vol%
Suction method(pour into by external unit)
1.5±0.1L/min
18vol%(L)【Standard】
POWER lamp lighting(green)
Gas concentration signal
Alarm contact(Gas alarm or Fault alarm or Gas・Fault common alarm)
Within ±0.7vol%
Difference between Alarm setpoint and indicated value of warning alarm are zero.
Within 30sec(T90)(without piping delay time)
By anoxia alarm(Alarm setpoints:18vol%), Less than 5sec.
(When introducing 10 - 11vol% gas)(Without piping delay time)Single alarm(L)ALM lamp lighting(red)Auto-recover
System failure/Sensor failure
FAULT lamp lighting(yellow)/content display
Auto-recoverNo-voltage contact 1a・Non-exciting at normal(exciting at alarm) or exciting at
normal(non-exciting at alarm)
30VDC - 0.5A(resistive load)
Three-wire analog transmission(in common with power supply<power supply,signal,common>)4 - 20mA DC (linear/load resistance less than 300Ω)
CVVS1.25 mm2 or 2.0mm2 - 3-core (when the contact isn’t used)
CVVS1.25 mm2 or 2.0mm2 - 5-core (when the contact is used)
Less than 1.25km in case of CVVS 1.25mm2
Less than 2.0km in case of CVVS 2.0mm2
24 VDC±10%
Alarm delay/suppression
MAX.1.1W
Adapter A<NPT1/2> or Adapter B<NPT3/4> or Flame proof packing
method<G3/4>(Compatible cables φ9.6 - 13.0mm in outer diameter)
Rc1/8(with PP elbow union for O.Dφ6-1t･PTFE pipe)
Approx.25sec-10 - +40℃(non-rapidly-vary)Less than 95%RH(non-condensing)
Wall mounting type
Flame proof structure

Tube connecting port
Initial clear
Operating temperature range
Operating humidity range
Structure
Explosion protected
construction
Explosion-proof class
Ⅱ2G Ex db ⅡC T6 Gb(ATEX/UKEX) / Ex db ⅡC T6 Gb(IECEx)
Dimensions
Approx.148(W)×205(H)×88(D)mm(projection portions excluded)
WeightApprox.2.9kg
Color
Munsell 7.5BG5/2*1 In conformity to JIS T8201 2010(Oxygen deficiency indicator)- 52 -

10 Product Specifications

10-1. List of specifications<ATEX/IECEx/UKEX・Leak Alarm Specification>
Model
Detection principle
Detection gas
Concentration display
Detection range
Detection method
Suction flow
Alarm setpoints
Power display
External output
Alarm accuracy(under an identical condition)
Alarm-delay time
(under an identical condition)
Gas alarm typeGas alarm display
Gas alarm patternFault alarm・Self diagnosis
Fault alarm display
Fault alarm pattern
Alarm contact
Contact capacity
Transmission scheme
Transmission specification
Transmission cable
Transmission distancePower supply
FunctionsPower consumption
Cabling port
Tube connecting port
Initial clear
Operating temperature range
Operating humidity range
Structure
Explosion protected
construction
Explosion-proof class
Dimensions
WeightColor

SD-1DOX
Galvanic cell method
O2
LED(4digits・7segments)
0 - 50vol%Suction method(pour into by external unit)
1.5±0.1L/min
25vol%(H)【Standard】
POWER lamp lighting(green)
Gas concentration signal
Alarm contact(Gas alarm or Fault alarm or Gas・Fault common alarm)
Within ±5vol% to leak alarm(Alarm setpoint value：25vol%)By leak alarm(Alarm setpoint value：25vol%),Within 30sec after providing the gas 1.6
times. (Without piping delay time)Single alarm(H)ALM lamp lighting(red)Auto-recover
System failure/Sensor failure
FAULT lamp lighting(yellow)/content display
Auto-recoverNo-voltage contact 1a・Non-exciting at normal(exciting at alarm) or exciting at
normal(non-exciting at alarm)
30VDC - 0.5A(resistive load)
Three-wire analog transmission(in common with power supply<power supply,signal,common>)4 - 20mA DC (linear/load resistance less than 300Ω)
CVVS1.25 mm2 or 2.0mm2 - 3-core (when the contact isn’t used)
CVVS1.25 mm2 or 2.0mm2 - 5-core (when the contact is used)
Less than 1.25km in case of CVVS 1.25mm2
Less than 2.0km in case of CVVS 2.0mm2
24 VDC±10%
Alarm delay/suppression
MAX.1.1W
Adapter A<NPT1/2> or Adapter B<NPT3/4> or Flame proof packing
method<G3/4>(Compatible cables φ9.6 - 13.0mm in outer diameter)
Rc1/8(with PP elbow union for O.Dφ6-1t･PTFE pipe)
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)×205(H)×88(D)mm(projection portions excluded)
Approx.2.9kg
Munsell 7.5BG5/2- 53 -

10 Product Specifications

10-1. List of specifications<ATEX/IECEx/UKEX・Gas Monitoring Specification>
Model
Detection principle
Detection gas
Concentration display
Detection range
Detection method
Suction flow
Alarm setpoints
Power display
External output
Indicate accuracy(under an identical condition)
Response time
(under an identical condition)
Gas alarm typeGas alarm display
Gas alarm patternFault alarm・Self diagnosis
Fault alarm display
Fault alarm pattern
Alarm contact
Contact capacity
Transmission scheme
Transmission specification
Transmission cable
Transmission distancePower supply
FunctionsPower consumption
Cabling port
Tube connecting port
Initial clear
Operating temperature range
Operating humidity range
Structure
Explosion protected
construction
Explosion-proof class
Dimensions
WeightColor

SD-1DOX
Galvanic cell method
O2
LED(4digits・7segments)
0 - 5vol%/0 - 10vol%/0 - 25vol%/0 - 50vol%/0 - 100vol%Suction method(pour into by external unit)
1.5±0.1L/min
Depend on detection range
POWER lamp lighting(green)
Gas concentration signal
Alarm contact(Gas alarm or Fault alarm or Gas・Fault common alarm)
Within ±0.7vol% (below 25vol% range)
Within ±3vol% (above 25vol% range)
Within 30sec(T90)(without piping delay time)Single alarm(H or L)
ALM lamp lighting(red)Auto-recover
System failure/Sensor failure
FAULT lamp lighting(yellow)/content display
Auto-recoverNo-voltage contact 1a・Non-exciting at normal(exciting at alarm) or exciting at
normal(non-exciting at alarm)
30VDC - 0.5A(resistive load)
Three-wire analog transmission(in common with power supply<power supply,signal,common>)4 - 20mA DC (linear/load resistance less than 300Ω)
CVVS1.25 mm2 or 2.0mm2 - 3-core (when the contact isn’t used)
CVVS1.25 mm2 or 2.0mm2 - 5-core (when the contact is used)
Less than 1.25km in case of CVVS 1.25mm2
Less than 2.0km in case of CVVS 2.0mm2
24 VDC±10%
Alarm delay/suppression
MAX.1.1W
Adapter A<NPT1/2> or Adapter B<NPT3/4> or Flame proof packing
method<G3/4>(Compatible cables φ9.6 - 13.0mm in outer diameter)
Rc1/8(with PP elbow union for O.Dφ6-1t･PTFE pipe)
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)×205(H)×88(D)mm(projection portions excluded)
Approx.2.9kg
Munsell 7.5BG5/2- 54 -

10 Product Specifications

10-1. List of specifications

Outline Drawings

Adapter(NPT 1/2 )- 55 -

10 Product Specifications

10-1. List of specifications<Japan Ex・Oxygen Deficiency Alarm Specification>
Model
Detection principle
Detection gas
Concentration display
Detection range
Detection method
Suction flow
Alarm setpoints
Power display
External output
Indicate accuracy*1(under an identical condition)
Accuracy of Alarm setpoint*1
Response time*1(under an identical condition)
Alarm-delay time*1(under an identical condition)
Gas alarm typeGas alarm display
Gas alarm patternFault alarm・Self diagnosis
Fault alarm display
Fault alarm pattern
Alarm contact
Contact capacity
Transmission scheme
Transmission specification
Transmission cable
Transmission distancePower supply
FunctionsPower consumption
Cabling port

SD-1DOX
Galvanic cell method
O2
LED(4digits・7segments)
0 - 25vol%
Suction method(pour into by external unit)
1.5±0.1L/min
18vol%(L)【Standard】
POWER lamp lighting(green)
Gas concentration signal
Alarm contact(Gas alarm or Fault alarm or Gas・Fault common alarm)
Within ±0.7vol%
Difference between Alarm setpoint and indicated value of warning alarm are zero.
Within 30sec(T90)(without piping delay time)
By anoxia alarm(Alarm preset point:18vol%), Less than 5sec.
(When introducing 10 - 11vol% gas)(Without piping delay time)Single alarm(L)ALM lamp lighting(red)Auto-recover
System failure/Sensor failure
FAULT lamp lighting(yellow)/content display
Auto-recoverNo-voltage contact 1a・Non-exciting at normal(exciting at alarm) or exciting at
normal(non-exciting at alarm)
250VAC - 0.5A/30VDC - 0.5A(resistive load)
Three-wire analog transmission(in common with power supply<power supply,signal,common>)4 - 20mA DC (linear/load resistance less than 300Ω)
CVVS1.25 mm2 or 2.0mm2 - 3-core(when the contact is not used)
CVVS1.25 mm2 or 2.0mm2 - 5-core(when the contact is used)
Less than 1.25km in case of CVVS 1.25mm2
Less than 2.0km in case of CVVS 2.0mm2
24 VDC±10%
Alarm delay/suppression
MAX.1.1W
Flame proof packing method<G3/4>(Compatible cables φ9.6 - 13.0mm in outer
diameter )Rc1/8(with PP elbow union for O.Dφ6-1t･PTFE pipe)
Approx.25sec-10 - +40℃(non-rapidly-vary)Less than 95%RH(non-condensing)
Wall mounting type
Flame proof structure

Tube connecting port
Initial clear
Operating temperature range
Operating humidity range
Structure
Explosion protected
construction
Explosion-proof class
Ex d ⅡC T6 X
Dimension
Approx.148(W)×205(H)×88(D)mm(projection portions excluded)
WeightApprox.2.9kg
Color
Munsell 7.5BG5/2*1 In conformity to JIS T8201 2010(Oxygen deficiency indicator)- 56 -

10 Product Specifications

10-1. List of specifications<Japan Ex・Leak Alarm Specification>
Model
Detection principle
Detection gas
Concentration display
Detection range
Detection method
Suction flow
Alarm setpoints
Power display
External output
Alarm accuracy(under an identical condition)
Alarm-delay time
(under an identical condition)
Gas alarm typeGas alarm display
Gas alarm patternFault alarm・Self diagnosis
Fault alarm display
Fault alarm pattern
Alarm contact
Contact capacity
Transmission scheme
Transmission specification
Transmission cable
Transmission distancePower supply
FunctionsPower consumption
Cabling port
Tube connecting port
Initial clear
Operating temperature range
Operating humidity range
Structure
Explosion protected
construction
Explosion-proof class
Dimension
WeightColor

SD-1DOX
Galvanic cell method
O2
LED(4digits・7segments)
0 - 50vol%Suction method(pour into by external unit)
1.5±0.1L/min
25vol%(H)【Standard】
POWER lamp lighting(green)
Gas concentration signal
Alarm contact(Gas alarm or Fault alarm or Gas・Fault common alarm)
Within ±5vol% to leak alarm(Alarm setpoint value：25vol%)By leak alarm(Alarm setpoint value：25vol%),Within 30sec after providing the gas 1.6
times.(without piping delay time)Single alarm(H)ALM lamp lighting(red)Auto-recover
System failure/Sensor failure
FAULT lamp lighting(yellow)/content display
Auto-recoverNo-voltage contact 1a・Non-exciting at normal(exciting at alarm) or exciting at
normal(non-exciting at alarm)
250VAC - 0.5A/30VDC - 0.5A(resistive load)
Three-wire analog transmission(in common with power supply<power supply,signal,common>)4 - 20mA DC (linear/load resistance less than 300Ω)
CVVS1.25 mm2 or 2.0mm2 - 3-core(when the contact is not used)
CVVS1.25 mm2 or 2.0mm2 - 5-core(when the contact is used)
Less than 1.25km in case of CVVS 1.25mm2
Less than 2.0km in case of CVVS 2.0mm2
24 VDC±10%
Alarm delay/suppression
MAX.1.1W
Flame proof packing method<G3/4>(Compatible cables φ9.6 - 13.0mm in outer
diameter )Rc1/8(with PP elbow union for O.Dφ6-1t･PTFE pipe)
Approx.25sec-10 - +40℃(non-rapidly-vary)Less than 95%RH(non-condensing)
Wall mounting type
Flame proof structure
Ex d ⅡC T6 X
Approx.148(W)×205(H)×88(D)mm(projection portions excluded)
Approx.2.9kg
Munsell 7.5BG5/2- 57 -

10 Product Specifications

10-1. List of specifications<Japan Ex・Gas Monitoring Specification>
Model
Detection principle
Detection gas
Concentration display
Detection range
Detection method
Suction flow
Alarm setpoints
Power display
External output
Indicate accuracy(under an identical condition)
Response time
(under an identical condition)
Gas alarm typeGas alarm display
Gas alarm patternFault alarm・Self diagnosis
Fault alarm display
Fault alarm pattern
Alarm contact
Contact capacity
Transmission scheme
Transmission specification
Transmission cable
Transmission distance
FunctionsPower supply
Power consumption
Cabling port
Tube connecting port
Initial clear
Operating temperature range
Operating humidity range
Structure
Explosion-proof class
Dimensions
WeightColor

SD-1DOX
Galvanic cell method
O2
LED(4digits・7segments)
0 - 5vol%/0 - 10vol%/0 - 25vol%/0 - 50vol%/0 - 100vol%Suction method(pour into by external unit)
1.5±0.1L/min
Depend on detection range
POWER lamp lighting(green)
Gas concentration signal
Alarm contact(Gas alarm or Fault alarm or Gas・Fault common alarm)
Within ±0.7vol% (below 25vol% range)
Within ±3vol% (above 25vol% range)
Within 30sec(T90)(without piping delay time)Single alarm(H or L)
ALM lamp lighting(red)Auto-recover
System failure/Sensor failure
FAULT lamp lighting(yellow)/content display
Auto-recoverNo-voltage contact 1a・Non-exciting at normal(exciting at alarm) or exciting at
normal(non-exciting at alarm)
250VAC - 0.5A/30VDC - 0.5A(resistive load)
Three-wire analog transmission(in common with power supply<power supply,signal,common>)4 - 20mA DC (linear/load resistance less than 300Ω)
CVVS1.25 mm2 or 2.0mm2 - 3-core(when the contact is not used)
CVVS1.25 mm2 or 2.0mm2 - 5-core(when the contact is used)
Less than 1.25km in case of CVVS 1.25mm2
Less than 2.0km in case of CVVS 2.0mm2
Alarm delay/suppression
24 VDC±10%
MAX.1.1W
Flame proof packing method<G3/4>(Compatible cables φ9.6 - 13.0mm in outer
diameter )Rc1/8(with PP elbow union for O.Dφ6-1t･PTFE pipe)
Approx.25sec-10 - +40℃(non-rapidly-vary)Less than 95%RH(non-condensing)
Wall mounting type
Flame proof structure
Ex d ⅡC T6 X
Approx.148(W)×205(H)×88(D)mm(projection portions excluded)
Approx.2.9kg
Munsell 7.5BG5/2- 58 -

10 Product Specifications

10-1. List of specifications

Outline Drawings

Cable gland (G3/4)- 59 -

10 Product Specifications

10-2. Detection principle

10-2. 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- 60 -

11

Definition of Terms
Galvanic cell type
Initial clear
Full scalevol%Atmosphere
Calibration
Zero suppression
Alarm delay time
INHIBIT

This is a principle of the sensor installed in the detector head.
See "10-2. Detection principle" for details.
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.
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).
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.

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