PT2E-2994

Smart Transmitter/Gas Detector Head

SD-1OX(TYPE MED EX)
Operating Manual(PT2-177)(PT2E-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 may be fluctuated by environmental (temperature, humidity etc.) changes
in the installation site. In addition, if atmosphere pressure correction setting mode is disabled, it
fluctuates 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.
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. Contact us for pretreatment systems that you will need for sampling gases from areas of high humidity,
high dust concentration, or acidic mist.
5. 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.

<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 ............................................................................................................. 8
3-1. Main unit and standard accessories .................................................................................. 8
3-2. Names and functions for each part ................................................................................... 9
3-3. Block diagram ................................................................................................................... 10
4 How to Use ............................................................................................................................ 11
4-1. Before using the gas detector ........................................................................................... 11
4-2. Precautions for installation sites ........................................................................................ 11
4-3. Precautions for system designing ..................................................................................... 12
4-4. How to install ..................................................................................................................... 13
4-5. Installation procedure ........................................................................................................ 15
4-6. How to wire ....................................................................................................................... 16
5 How to Operate ..................................................................................................................... 20
5-1. Preparation for start-up ..................................................................................................... 20
5-2. Basic operating procedures............................................................................................... 20
5-3. How to start the gas detector ............................................................................................ 21
5-4. Modes ............................................................................................................................... 225-5. Maintenance mode (User) ................................................................................................. 23
5-6. How to exit ........................................................................................................................ 25
6 Operations and Functions ..................................................................................................... 26
6-1. Alarm activation ................................................................................................................. 26
6-2. Fault alarm activation ........................................................................................................ 27
6-3. Warning activation ............................................................................................................. 27
6-4. External output operation .................................................................................................. 28
6-5. Other functions .................................................................................................................. 29
7 Maintenance .......................................................................................................................... 30
7-1. Maintenance intervals and items ....................................................................................... 30
7-2. Maintenance mode (Regular maintenance) ...................................................................... 32
7-3. Calibration method ............................................................................................................ 39
7-4. Parts replacement ............................................................................................................. 42
8 Storage, Relocation and Disposal ......................................................................................... 43
8-1. Procedures to store the gas detector or leave it for a long time ........................................ 43
8-2. Procedures to relocate the detector or use it again ........................................................... 43
8-3. Disposal of products .......................................................................................................... 43
9 Troubleshooting ..................................................................................................................... 44
10 Product Specifications ......................................................................................................... 46
10-1. List of specifications ........................................................................................................ 46
10-2. Detection principle ........................................................................................................... 49
11 Definition of Terms ............................................................................................................... 50-1-

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 MED EX). Please checkthat 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.

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. The HART communication function can be used only
during maintenance.
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.

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 marking type. You can confirm instrument specification to see name plate as
follows.
Ex marking

CE marking

ATEX/IECEx, CE marking type name plate

MED mark

MED mark position-3-

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: -20 to +60°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.

Nitrile rubber (NBR) is used for the cable gland component. The presence of organic solventsand alkalis (liquid or vapor) in the measurement environment may compromise the explosionproof integrity.

-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(AIR adjustment) in atmosphere
When the span adjustment(AIR adjustment) is performed in the atmosphere, check theatmosphere for freshness before beginning the adjustment. If interference gases exist, theadjustment 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.

-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 highlyconcentrated vapor) and others are applied to the plate for a long time, its color and shape may bechanged.
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 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
II
2G
Ex db IIC T6
Gb-20C to +60C
Supply voltage: 24VDC±10% 45mA
Output signal (4 to 20 mA): 24VDC 22mA
IEC 60079-0: 2017，IEC 60079-1: 2014-06
EN IEC 60079-0: 2018，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 “10-1. List of 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-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)

Display
Adapter(NPT 1/2 )<Standard Accessories>Operating manual･･････････････････ one
Dedicated handling lever ･･･････････ 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.

-8-3 Product Components

3-2. Names and functions for each part3-2. 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.

-9-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)

Transmitter

Controller(CPU)

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

Sensor*It is used only for maintenance.

- 10 -

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.

NOTE
・Regarding the use, setting, and maintenance of gas detectors, it is recommended to refer to standards
that are appropriate for each country's regulations. Example) IEC 60079-29-2, EN 60079-29-2, NFPA 70.

4-2. Precautions for installation sites
CAUTION
This is a precision device. Because the detector may not provide the specified performance insome places (environments), check the environment in the installation point, and then takeappropriate 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.
*For operating temperature range, see “10-1. List of specifications” for details.
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.

- 11 -

4 How to Use

4-3. Precautions for system designing

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.
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 isperformed 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 ina 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. In particular, areas
with carbon dioxide concentration over 15 vol% may influence the detector readings.

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 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.

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4 How to Use

Protection against
lightning

Grounding*

4-4. How to install

Take appropriate measures in accordance with the importance of the facilities andthe environment.
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>

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 screws fixing the lid and the main body with the tightening torque of
215.6±24.5N･cm.
 When closing the lid of the detector, please wipe the screw and the mating surface of the main body andthe lid, and apply our company-specified grease.
 To maintain compliance to EN50104, ensure orientation is within ±90° of normal on installation.
(Sensor part installed downward)

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.
- 13 -

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 formedon the sensor may cause abnormal detection.

NOTE
・Hexagon socket head cap screws with strength class "A2-70" are used.
When you lost or replace it, we recommend that you ask our local sales office nearest you.
・Our company-specified grease : BARRIERTA JFE 552（NOK KLUBER made）
If you can not prepare the specified grease, please use one that meets the following requirements.
1. Those not cured by deterioration
2. Those containing no volatile solvent
3. Those which do not cause corrosion on joint surfaces
4. Those not including silicon type- 14 -

4 How to Use

4-5. Installation procedure

4-5. Installation procedure
The detector comes with adapter A (NPT 1/2) as standard.
Please prepare the Ex cable gland that is suitable for the adapter.

Adapter A(NPT1/2)

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 ischanged, lost etc.

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- 15 -

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 thepower cables and signal cables in a metal conduit. The conduit must be connected to agrounding 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 Cable>
3-wire4-wireCVVS1.25 mm2 or 2.0mm2 - 3-core
CVVS1.25 mm2 or 2.0mm2 - 4-core<Figure of Terminal Plate>
DC+

1

DC-

2

Sig+

3

Sig-

4

DC24V

4-20mA+
HART

Groundingterminal<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)- 16 -

4 How to Use

4-6. How to wire

<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.

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 electrificationor heating.
Damaging the wire insulation due to a shorter bare wire length may cause defective electrificationor 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.

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 principal, 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.
This may cause defective electrification or heating.
When the wire is inserted under the spring by mistake, it does not contact the conductive part. Thismay cause defective electrification or heating.

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4 How to Use

4-6. How to wire

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.)- 18 -

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.
To connect the grounding wire to the internal grounding terminal of the main unit, use crimp
terminal, and use external grounding wire with a cross sectional area of 4 mm2 or more for theexternal grounding terminal.

<Wiring Example>
Connecting to the indicator

RM-5003 etc.

Connecting to the upper unit (DCS, PLC)

Power supply(24VDC)

Relay terminal plate

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.

- 19 -

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>><<Fault Status>><<Maintenance Mode>>

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

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5 How to Operate

5-3. How to start the gas detector

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.
After initialization is complete, perform a span adjustment.

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

Power On

Initial Clear

Detection Mode

- 21 -

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

Details
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.
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 for 20.9%
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
Display various electrical settings.
This is not typically used by the user.

Maintenance Mode
(Regularmaintenance)
Environmental
Setting

2-4

Display

2-5

Switch to Factory2-6
Not used.
Mode
Switch to User Mode 2-7
Returns to the user mode.
※Maintenance mode has setting item with important tool. As operation that mistook for this reason
may be occurred, this detector to malfunction, our service engineer for maintenance manipulate.
This is not typically used by the user.
- 22 -

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
Perform the span adjustment.

Span Adjustment

1-2. Various Setting Display
Display various setting values.

Setting Display

1-3. Mode Switching
Switch to the regular
maintenance mode.
This is not typically used by theuser.

See "Regular maintenancemode".
=> P34

To 1-0- 23 -=> P24=> P25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
keywhen the reading is stabilized.

21.2

Span Adjustment (AIR Adjustment)
After the reading will flash, adjust thedisplay
value 20.9 by pressing the ▲ or ▼k

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.

- 24 -

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

Atmosphere Pressure
Correction Settingon

To Alarm Setpoint Display

5-6. 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 activated on the upper (central) system.
 Before turning off the detector, INHIBIT (point skip) on the upper (central) system must be
activated. Decide whether power can be turned off by checking the operation of the devices
connected to the external output terminal of the detector.

- 25 -

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 thedetector 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 fell below.

<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)

Key operation- 26 -

6 Operations and Functions

6-2. Fault alarm activation<Response to Alarm>
An oxygen concentration value falls below 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 temporary, the reading may already have returned to normal by the time of inspection whenchecking it. In addition, when the alarm is triggered by noise or other incidental conditions other than a gas,
the reading may have already returned to normal.
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, andthen check that the gas concentration reading rose.
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 LCD. Determine the causes and takeappropriate actions.
After the detector is successfully returned from the fault, it restarts with the process normally performed
right after it is turned on (initial clear).
If the detector has problems and is repeatedly malfunctioning, contact our overseas sales department or
local representatives 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".

6-3. Warning activation
When the environmental temperature exceeds the operating temperature of the detector, gasconcentration and warning number[E-27] are shown alternately. Since this case is not failure, still thedetector works. It outputs 4-20mA depending on gas concentration and does not light up failure lamp.
Operating temperature：-10 to +40°C (non-rapidly-vary)- 27 -

6 Operations and Functions

6-4. External output operation

6-4. External output operation
Signal Transmission System
Transmission Path
Transmission DistanceConnection Load ResistanceModePower Off1
2
Initial Clear
3
Detection Mode(No alarm)4
Detection Mode(Gas alarm)5
Detection Mode
(Full scale over)6
Out of operating temperature
range
7
Fault Alarm
8
INHIBIT
9
Alarm Test Mode
1011

User Mode
Maintenance Mode

Electric current transmission (non-isolated) 4 – 20 mA
CVVS
CVVS 1.25 mm2: Within 1.25km
CVVS 2.0 mm2: Within 2.0km
Below 300 Ω
4 - 20 mA(output value)
0 mA
21.5 mA (Fixed)
4 - 20 mA (concentration output)
4 - 20 mA (concentration output)
20.5 mA (Fixed)
4 - 20 mA (concentration output)
0.5 mA (Fixed)
21.5 mA (Fixed)
Output ON setting: 4 - 20 mA (concentration output)
Output OFF setting: 4 mA
4 - 20 mA (concentration output)
21.5 mA (Fixed)

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 20.5
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.

- 28 -

6 Operations and Functions

6-5. Other functions

6-5. 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
the setting 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 thesetting value is displayed.

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

- 29 -

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
Ground wire
check

Maintenance content
Check that the power lamp lights up.

Daily
maintenance

Monthly
maintenanceRegularmaintenance

○

○

○

Check that the concentration display value is zero. Whenthe reading is incorrect, perform the zero 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 the calibration
gas.
Check the gas alarm by using the calibration gas.

○

○

○

－

○

○

－

－

○

－

－

○

Check the connection of the grounding wire (nolooseness or corrosion) to maintain EMC performance.

－

－

○

<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
our maintenance service.
The followings are typical maintenance services. For more information, please contact RIKEN
KEIKI.

- 30 -

7 Maintenance7-1. Maintenance intervals and items

Main Services
Power Supply
Check

:

Concentration
Display 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.
Inspects the alarm circuit by using the alarm test function.

Checks the alarm lamps. (Checks ALM 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 ALM 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.

- 31 -

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 for 20.9%
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
Display various electrical settings.
This is not typically used by the user.
Not used.
Returns to the user mode.

Maintenance
Mode(Regularmaintenance)< Environment setting items and adjustment range >The unit is set at the factory to operate properly. Changing settings is not recommended. If any change isnecessary, carefully consider that there are no operational problems.
LED
display
2-4.1
2-4.2
2-4.6

Item
INHIBIT
Alarm Setpoint
Zero Suppression Value

Factory setting
value
OFF
18.0vol%
0.5vol%- 32 -

Adjustable range
OFF / ON
10% FS to 100% FS
20.4vol% to 21.4vol%

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

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

Then press SET key again
for three seconds.

0000

Maintenance Mode
2-0. Test Mode
Perform various tests.

Test Mode=> P342-1. Zero Adjustment(N2 adjustment)
Perform the zero adjustment(N2 adjustment).

Zero Adjustment=> P412-2. Span Adjustment(AIR adjustment)
Perform the span adjustment(AIR adjustment).

Span
Adjustment=> P392-3. Zero/Span Initialization
Initialize the zero/span
adjustment after the sensor is
replaced.
2-4. Environmental Setting
Set various operations andfunctions.

Environmental
Setting=> P382-4.0 and 2-4.3 to 2-4.F arefactory-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 returnto the usermode.
To 2-0. Test Mode
- 33 -

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

Gas Test

2-0.0 Gas Test=> P35

Alarm Test=> P35

Fault Test=> P362-0.3 LED Test

LED Test=> P362-0.4 Memory Test

Memory Test

2-0.1 Alarm Test

2-0.2 Fault Test=> P37

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 iscompleted, 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 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.

- 34 -

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.

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

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">
2-0.1
Press 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

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

- 35 -

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.)

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

<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.)- 36 -

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.

- 37 -

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.

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

Alarm Setpoint Setting=> P382-4.3～2-4.F
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- 38 -

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
(Setting：1.5±0.5L/min)<SD-1OX>

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 theatmosphere for freshness before beginning the adjustment. If interference gases exist, theadjustment 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.

- 39 -

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 thedisplay
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,the span 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.

- 40 -

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.

- 41 -

7 Maintenance7-4. Parts replacement

7-4. Parts replacement<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*

Maintenanceintervals

Replacement
intervals (year)

Quantity(pieces/unit)

Rubber seal (sensor)

6 months

3 - 8 years

1

2

O ring (sensor)

6 months

3 - 8 years

1

3

Slip ring (sensor guard)

6 months

3 - 8 years

1

No.

Name

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 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.

- 42 -

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, humidity and pressure away from direct sunlightIn a place where gases, solvents or vapors are not presentStorage life of the equipment and sensor are each 3 years and 6 months.

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.

- 43 -

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

FAULT

―

―

●

Causes
The wiring is not correct.
The terminal plate isremoved.

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.

Check if the cable is securely fastened to theterminal plate.

Faults of the sensor
The rated voltage is not
supplied to the detector.

Systemabnormalities
E-9

Actions
Connect the wiring properly.

Replace the sensor with a new one.
Check the power supply, and supply the rated
voltage. It occurs when the voltage of thepower supply falls below 17.0 V.

Abnormalities of ROM,
RAM or EEPROM insideof the detector

Please contact our overseas sales department
or local representatives.

Output signal (4-20mA)
does not work correctly.

Check if the cable for external output iscorrectly connected. (Deterioration of thecable, 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 ouroverseas sales department or local agents
because a failure inside this detector might beoccurred.

●- 44 -

9 Troubleshooting<Abnormalities of Readings>
Symptoms

CausesDrifting of sensor
output

The reading rises (drops)
and it remains so.

Slow leakEnvironmental
changes

Perform the zero adjustment (or span adjustment).

Sudden change inthe environment

Deteriorated sensor
sensitivity
Improper calibration
gas concentration
Deteriorated sensor
sensitivity

Slow response
Span adjustment
impossible

Perform the zero adjustment (or span adjustment).
A 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.

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

Actions

Turn off and restart the detector.
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.
In some cases, the detector triggers an indication alarm.
Because the detector cannot be used under sudden andfrequent environmental changes, any preventive actions
to eliminate them should be taken by the user.
Replace the sensor with a new one.
Use the proper calibration gas.
Replace the sensor with a new one.

<Abnormalities of installation environment>
Symptom/Display
Out of operating
temperature
range
E-27

FAULT

Causes―

The environmental
temperature is out of
operating temperaturerange- 45 -

Actions
Operating temperature range is -10 to +40°C.
If environmental temperature is out of operating
temperature range, countermeasure for adjusting
environmental temperature is needed to beconsidered.

10 Product Specifications

10-1. List of specifications

10

Product Specifications
10-1. List of specifications
Model
Type
Detection principle
Detection gas
Concentration display
Detection range
Resolution
Detection method
Alarm setpoints
Power display
External output
Indicate accuracy*1

SD-1OXTYPE MED EX
Galvanic cell method
O2
LED(4digits・7segments)
0 - 25vol%0.1vol%Diffusion method
18vol%(L)【Standard】
POWER lamp lighting(green)
Gas concentration signal (4-20mA output)
Within ±0.7vol%(under an identical condition)

Accuracy of Alarm setpoint*1
Response time
Alarm-delay time*1
Equipment drift
Gas alarm typeGas alarm display
Gas alarm patternFault alarm･Self diagnosis
Fault alarm display
Fault alarm pattern
Transmission scheme
Transmission specification
Communication scheme
Transmission cable
Transmission distance
FunctionsPower supply
Power consumption
Cabling port
Initial clear
Operating temperature range
Operating humidity range
Operating pressure range
Storage temperature range
Structure
Explosion protected
construction

Difference between Alarm setpoint and indicated value of warning alarm are zero.
T90<45 sec. ; T20<10sec. *2
By anoxia alarm(Alarm setpoint:18vol%), Less than 5sec.
(When introducing 10 - 11vol% gas)
±0.5vol% / year *3
Single alarm(L)ALM lamp lighting(red)Auto-recover
System failure (E-9)/Sensor failure (E-1)
FAULT lamp lighting(yellow)/Error number display
System failure : Self-latching
Sensor failure : Auto-recoverThree-wire analog transmission(in common with power supply<power
supply,signal,common>)or Two-wire analog transmission + digital transmission(HART communication)
4 - 20mADC(linear・load resistance less than 300Ω)
HART 7 (For maintenance function only)
CVVS worth of shield cable(1.25mm2)･4-core or 3-core
CVVS worth of shield cable(2.0mm2)･4-core or 3-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
24VDC±10%MAX.1.1W
Adapter A<NPT1/2> or adapter B<NPT3/4> or adapter<M20×1.5> or
Pressure proof packing gland <G3/4> (Compatible cables φ9.6 - 13.0mm in outer
diameter)Approx.25sec-10 to +40°C (non-rapidly-vary)Less than 95%RH(non-condensing)
80 to 120kPa-20 to +40°C
Wall mounting type
Flame proof structure- 46 -

10 Product Specifications

10-1. List of specifications

Explosion-proof class
II 2 G Ex db IIC T6 Gb (ATEX) / Ex db ⅡC T6 Gb (IECEx)
Dimensions
Approx.148(W)×208(H)×88(D)mm(projection portions excluded)
WeightApprox.2.5kg
Color
Munsell 7.5BG5/2*1 In conformity to JIS T8201 2010(Oxygen deficiency indicator)*2 At 20°C, T90<20 sec.; at 10°C, T90<30 sec. Otherwise response time is independent of humidity and variation withinflowrate range (1.5±0.5 L/min).
*3 At 25°C, 50%RH and constant pressure.

Outline Drawings

Adapter A<NPT1/2>- 47 -

10 Product Specifications

10-1. List of specifications

EN 50104 approved option item
No.

Item nameItem sub name

Part number

1

Calibration cap

SD-1EC／OX

4287 9189 10

Figure 1

2

Dedicated control key---------

4286 9200 80

Figure 2

Figure 1

Figure 2- 48 -

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 filledwith electrolyte. A part of the container is opened and covered with a barrier. The negative electrode isinstalled in contact with the barrier. Lead wires are drawn from the positive and negative electrodes toobtain outputs. A thermistor is connected between the lead wires to perform temperature compensation forthe sensor outputs.
Barrier
Negative
electrode

Electrolyte

Positive
electrodeContainer
Lead wire

Thermistor

Output- 49 -

11 Definition of Terms

11

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

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 -20 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 thecalibration gas.
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.
4-20mA DC signal digitals signalling is superimposed, and is methods that transmit
multiple signals.

- 50 -

Revision History
Edition

Revision

Date issued

0First edition

10/23/2020

1

Declaration of Conformity

11/12/2021

2
3
4

P22, 29, 32, 33, 38 Deleted mention of negative suppression values
P28 Change graph of gas concentration and external output
P33 Deleted information regarding password entry when transitioning tomaintenance mode.
UKEX added, CE Declaration of Conformity changed, UKCA Declaration ofConformity changed added
UKEX and UKCA deleted, Declaration of Conformity updated

7/29/2022
10/12/2023
5/31/2024