Riken Keiki SD-1EC User manual

PT2E-17610
Smart Transmitter/Gas Detector Head
SD-1EC
Operating Manual
(PT2E-176)
(PT2-176)

Operating Precautions
This detector is a gas detector that detects toxic gases in the air and triggers a gas alarm.
The gas detector is a safety unit, not an analyzer or densitometer which performs quantitative/qualitative
analysis/measurement for gases.
Please fully understand the following points before using it, so that it can be used properly.
1. The detector may be interfered by gases other than the gas to be detected, solvents, vapors etc.
Please note that the alarm may be triggered by interference. In addition, it may be fluctuated by
environmental (temperature, humidity etc.) changes in the installation site.
2. The alarm must be set within a range where the performance of the detector can be ensured.
In facilities compliant with the High Pressure Gas Safety Act, an alarm setting below our standard alarm
setpoint (threshold limit value) may trigger a false alarm.
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 the
analog signal output must be used for an indicator or external recorder.
4. Because the contact point of the gas detector sensor is made of porous polymeric membrane, the water
repellency of the membrane is deteriorated by solvents, thus causing an electrolyte leak from its inside.
Do not use solvents near the detector. If a solvent is used for unavoidable reasons, attach the
recommended filter to the inlet of the gas detector while using the solvent and for one hour after that.
5. For maintenance of the detector, it must go through a regular maintenance, including replacement and
adjustment of the regular replacement parts as specified in the operating manual. In addition, because
this is a safety unit, it is recommended that a regular maintenance and a calibration are performed
every six months in accordance with the regulations.

- 1 -
<Contents>
1 Outline of the Product ......................................................................................................... 2
1-1. Preface.............................................................................................................................. 2
1-2. Purpose of use .................................................................................................................. 2
1-3. Definition of DANGER, WARNING, CAUTION, and NOTE............................................... 2
1-4. Method of confirmation for Standards and Explosion proof specification .......................... 3
2 Important Notices on Safety................................................................................................ 4
2-1. Danger cases .................................................................................................................... 4
2-2. Warning cases .................................................................................................................. 5
2-3. Precautions ....................................................................................................................... 6
2-4. Safety Information ............................................................................................................. 7
3 Product Components .......................................................................................................... 9
3-1. Gas detector and standard accessories............................................................................ 9
3-2. Names and functions for each part ................................................................................... 10
3-3. Block diagram ................................................................................................................... 11
4 How to Use ......................................................................................................................... 12
4-1. Before using the detector .................................................................................................. 12
4-2. Precautions for installation points...................................................................................... 12
4-3. Precautions for system designing ..................................................................................... 13
4-4. How to install..................................................................................................................... 15
4-5. Installation procedure........................................................................................................ 17
4-6. How to wire ....................................................................................................................... 19
5 How to Operate................................................................................................................... 23
5-1. Preparation for start-up ..................................................................................................... 23
5-2. Basic operating procedures............................................................................................... 23
5-3. How to start the detector ................................................................................................... 24
5-5. Maintenance mode (User)................................................................................................. 26
5-6. How to exit ........................................................................................................................ 28
6 Operations and Functions................................................................................................... 29
6-1. Gas alarm activation ......................................................................................................... 29
6-2. Fault alarm activation ........................................................................................................ 30
6-3. External output operation .................................................................................................. 31
6-4. Other functions.................................................................................................................. 32
7 Maintenance ....................................................................................................................... 33
7-1. Maintenance intervals and items....................................................................................... 33
7-2. Maintenance Mode(Regular maintenance) ....................................................................... 35
7-3. Calibration method ............................................................................................................ 42
7-4. Parts replacement ............................................................................................................. 45
8 Storage, Relocation and Disposal....................................................................................... 47
8-1. Procedures to store the detector or leave it for a long time............................................... 47
8-2. Procedures to relocate the detector or use it again........................................................... 47
8-3. Disposal of products.......................................................................................................... 47
9 Troubleshooting .................................................................................................................. 48
10 Product Specifications......................................................................................................... 50
10-1. List of specifications ........................................................................................................ 50
10-2. Detection principle........................................................................................................... 54
11 Definition of Terms............................................................................................................... 55

1 Outline of the Product 1-1. Preface
- 2 -
1
Outline of the Product
1-1. Preface
Thank you for choosing our smart transmitter/gas detector head SD-1EC. Please check that the model
number of the product you purchased is included in the specifications on this manual.
This manual explains how to use the detector and its specifications. It contains information required for
using the gas detector properly. Not only the first-time users but also the users who have already used the
product must read and understand the operating manual to enhance the knowledge and experience before
using the detector.
Although the number of digits to display varies depending on the detection range, this manual provides
explanation using a detection range from 0 to 150ppm as examples (such as examples of LED display).
1-2. Purpose of use
This detector is a fixed type gas detector head that detects leak of toxic gases 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) with
the built-in gas sensor. The concentrations of detected gases are displayed on the seven-segment
LED.
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.
1-3. Definition of DANGER, WARNING, CAUTION, and
NOTE
DANGER This message indicates that improper handling may cause serious damage on
life, health or assets.
WARNING This message indicates that improper handling may cause serious damage on
health or assets.
CAUTION This message indicates that improper handling may cause minor damage on
health or assets.
NOTE This message indicates advice on handling.

1 Outline of the Product 1-4. Method of confirmation for Standards and Explosion proof specification
- 3 -
1-4. Method of confirmation for Standards and
Explosion proof specification
This instrument has some specification depends on standard and explosion proof certificate. Please
confirm the detector specification before using. Please refer Declaration of Conformity that is at the end of
this manual if you have CE marking type. You can confirm instrument specification to see name plate as
follows.
ATEX/IECEx, CE marking type name plate TIIS type name plate
TIIS certificate
CE marking
Ex marking

2 Important Notices on Safety 2-1. Danger cases
- 4 -
2
Important Notices on
Safety
2-1. Danger cases
DANGER
<About explosion-proof>
The window plate material is a polycarbonate resin. Do not use organic solvents and alkali types
(liquid or vapor). It may cause the color and shape of the window plate to be changed.
Do not open the lid when applying current.
Do not attempt to repair the detector.
For the lid, use hexagon socket head bolts specified by RIKEN KEIKI.
Do not apply a strong force or shock to the window plate. The explosion-proof performances may
be deteriorated due to damages. The explosion protection conditions for the detector is "low (2J)"
possibility of mechanical damage.
Ambient temperature:
ATEX/IECEx Specifications: -20 to +60°C
TIIS Specifications: -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 is
changed, lost etc.
Do not repair the explosion-proof joint surface.
Be careful not to hit sharp tools against the window plate.

2 Important Notices on Safety 2-2. Warning cases
- 5 -
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 are
found 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.
Zero adjustment in the atmosphere
When the zero 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.
Response to gas alarm
Issuance of a gas alarm indicates that there are extreme dangers. Take proper actions based on
your judgment.
Handling of sensor
Do not disassemble the sensor used by the detector because it contains electrolyte. Electrolyte
may cause severe skin burns if it contacts skin, while it may cause blindness if its contacts eyes. If
electrolyte is adhered on your clothes, that part on your clothes is discolored or its material is
decomposed. If contact occurs, rinse the area immediately with a large quantity of water.

2 Important Notices on Safety 2-3. Precautions
- 6 -
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 other
units.
Do not disassemble/modify the detector, or change the settings if not necessary.
Disassembling/modifying the detector will invalidate the warranty of the performance. Changing the
settings without understanding the specifications may cause alarm malfunctions. Please use the
detector properly in accordance with the operating manual.
Avoid applying organic solvents and others to the window plate for a long time.
The window plate material is a polycarbonate resin. When organic solvents (liquid or highly-
concentrated vapor) and others are applied to the plate for a long time, its color and shape may be
changed.
Never fail to perform a regular maintenance.
Since this is a safety unit, a regular maintenance must be performed to ensure safety. Continuing
to use the detector without performing a maintenance will deteriorate the sensitivity of the sensor,
thus resulting in inaccurate gas detection.

2 Important Notices on Safety 2-4. Safety Information
- 7 -
2-4. Safety Information
Necessary information for explosion proof construction of Model SD-1EC.
The Model SD-1EC 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 Specifications>
Technical Data
(Protection Method) Flameproof enclosure “d”
(Certificate Numbers) IECEx DEK 13.0024X
DEKRA 13ATEX0035 X
(Group) II
(Category) 2G
(Type of Protection and Marking code) Ex db llC T6
(Equipment Protection Level) Gb
(Ambient Temperature)* -20C to +60C
(Electrical Data) Supply voltage: 24 V DC ±10% 45mA
Output signal (4 to 20 mA): DC24V 22mA
Relay(Contactoutput):DC30VorAC250V0.5A
(Applicable Standard) IEC 60079-0: 2017，IEC 60079-1: 2014-06
EN IEC 60079-0: 2018，EN 60079-1: 2014
(Manual Number) PT2E-176
* 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.
Installation
GND
Sig+
RLY
GND
Sig+
RLY
Indicator etc.
24V
GasDetector (SD‐1EC)
Hazardous Location
(Zone1)
Nonhazardous Location
InstallationDiagram
CVVSCable
24V

2 Important Notices on Safety 2-4. Safety Information
- 8 -
<TIIS Specifications>
Technical Data
(Protection Method) Flameproof enclosure
(Explosion-proof class) Ex d llC T6 X
(Ambient Temperature)* -20C to +53C
(Electrical Data) Supply voltage: DC24V±10% 45mA
Detecting element output signal: DC0.5V 0.5mA
Analogsignaloutput:DC24V22mA
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 the
temperature range which can maintain the explosion-proof performance and not the product performance,
see “10-1. List of specifications” for details.
Installation
GND
Sig+
RLY
GND
Sig+
RLY
Indicator etc.
24V
GasDetector (SD‐1EC)
Hazardous Location
(Zone1)
Nonhazardous Location
InstallationDiagram
CVVSCable
24V

3 Product Components 3-1. Gas detector and standard accessories
- 9 -
3
Product Components
3-1. Gas detector and standard accessories
<Main Unit> (including a cable gland or an adapter)
【ATEX/IECEx Specifications】
【TIIS Specifications】
Adapte
r
(NPT 1/2 )

3 Product Components 3-2. Names and functions for each part
- 10 -
<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 units one
11 to 20 units two
21 to 50 units three
over 51 units four
3-2. Names and functions for each part
(1) MENU/ESC key Used to enter the maintenance mode.
It is also used to cancel in a specific mode.
(2) SET key It is used for value confirmation and so on in a specific
mode.
(3) ▲key Used to switch menus or change a value (UP).
(4) ▼key Used to switch menus or change a value (DOWN).
(5) Power lamp
Power lamp.
Detection mode: It lights up in green.
Maintenance mode: It blinks in green.
(6) Alarm lamp Alarm lamp. It lights up in red when the alarm setpoint value
is reached.
(7) Fault lamp Fault lamp. It lights up in yellow when an abnormality is
detected in the detector.
(8) Concentration value
display Display the gas concentration and so on.
CAUTION
Use the supplied dedicated control key to operate the detector. If products other than these
accessories 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) Concentration value display
(5) Power lamp (6) Alarm lamp (7) Fault lamp
(1) MENU/ESC key
(2) SET key (4) ▼key
(3) ▲key

3 Product Components 3-3. Block diagram
- 11 -
3-3. Block diagram
<Electric Diagram>
Sensor
Controller
(CPU)
POWER INPUT (24 VDC)
Power supply part
1.Gas alarm contact (ALARM)
or
2.Fault contact (FAULT)
or
3.Select either gas alarm or
contact (ALARM/FAULT)
Contact activation
De-energized (De-energized
at a normal state)
ON-ALARM (Closed contact
at an alarm state)
Alarm contact controller
Display
（POWER）（ALARM）（FAULT)
Seven-segment LED
(four-digit)
Magnetic operation part
(MENU/ESC) (▲) (▼) (SET)
Transmitter
4 – 20 mA transmission

4 How to Use 4-1. Before using the detector
- 12 -
4
How to Use
4-1. Before using the detector
Not only the first-time users but also the users who have already used the detector must follow the
operating precautions.
Ignoring the precautions may damage the gas detector, resulting in inaccurate gas detection.
4-2. Precautions for installation points
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.
<ATEX/IECEx Specifications> -10 to +40°C
<TIIS Specifications> -10 to +40°C
Do not install the detector in a place exposed to direct sunlight or sudden changes in the temperature.
When selecting installation points, avoid a place where it is exposed to direct sunlight or radiant heat
(infrared rays emitted from a high-temperature object), and where the temperature changes suddenly.
Condensation may be formed inside the detector, or the detector cannot adjust to sudden changes in the
temperature.
Keep the detector (and its cables) away from noise source devices.
When selecting installation points, avoid a place where high-frequency/high-voltage devices exist.
CAUTION
This is a precision device. Because the detector may not provide the specified performance in
some places (environments), check the environment in the installation point, and then take
appropriate actions if necessary.
Because the detector plays an important role for safety and disaster prevention, as many units of
the detector as needed must be installed in appropriate points.
Because points where gases leak and remain easily are different depending on the types of gases
and the working areas, please decide carefully on installation points and the number of units to be
installed.

4 How to Use 4-3. Precautions for system designing
- 13 -
Do not install the detector in a place where maintenance of the detector cannot be performed or where
handling the detector involves dangers.
Regular maintenance of the detector must be performed.
Do not install the detector in a place where the machinery must be stopped when maintenance is
performed in its inside, where parts of the machinery must be removed to perform maintenance, or where
the detector cannot be removed because tubes or racks prevent access to it. Do not install the detector in
a place where maintenance involves dangers, for example, near a high-voltage cable.
Do not install the detector in machinery which is not properly grounded.
Before installing the detector in machinery, the machinery must be grounded properly.
Do not install the detector in a place where interference gases exist around it.
The detector must not be installed in a place where interference gases exist around it.
4-3. Precautions for system designing
Using a stable power supply
The external output and alarm contact of the detector may be activated when the power is turned on, when
momentary blackout occurs, or while the system is being stabilized. In such cases, use a UPS
(uninterruptible power supply), or take appropriate actions on the receiving side.
The detector must be provided with the following power supply.
Power supply voltage 24 VDC±10%: Terminal voltage of the detector
Allowed time of
momentary blackout
Up to 10 milliseconds
(To recover from the momentary
blackout for 10 milliseconds or more,
restart the detector.)
Example of actions
To ensure continuous operation and
activation, install a UPS outside the
detector.
Others
Do not use it with a power supply of
large power load or high-frequency
noise.
Example of actions
Use a line filter to avoid the noise source
if necessary.
Introducing protective measures against lightning
If cables are installed outside the factory/plant, or if internal cables are installed in the same duct as the
cables coming from outside the factory/plant, "lightning" will cause problems. Because lightning acts as a
large emission source while cables act as a receiving antenna, devices connected to the cables may be
damaged.
Lightning cannot be prevented. Cables installed in a metal conduit or under the ground cannot be
completely protected from inductive lightning surge caused by lightning. Although complete elimination of
disasters caused by lightning is impossible, the following protective measures can be taken.
Protection against
lightning
Take appropriate measures in accordance with the importance of the facilities and
the environment.
Provide protection by a lightning arrester (cable arrester).
(Although inductive lightning surge can be transmitted through the cable, it is
prevented by installing a lightning arrester before the field devices and central
processing equipment. For information on how to use a lightning arrester,
please contact the manufacturer.)
Grounding In addition to lightning, there are more sources of surge noise. To protect units from
these noise sources, the units must be grounded.
* The lightning arrester has a circuit to remove a surge voltage which damages field devices, so that
signals may be attenuated. Before installing a lightning arrester, verify that it works properly.
CAUTION
An unstable power supply and noise may cause malfunctions or false alarms.
The descriptions in this section must be reflected on the designing of a system using the detector.

4 How to Use 4-3. Precautions for system designing
- 14 -
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 counter
electromotive 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
If load is to be activated, appropriate measures must be taken to stabilize the operation of the detector and
protect 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
the same time, the surge absorbing part SK1 suitable for the specifications must be attached to the
external relay.
In addition, the surge absorbing part SK2 must be attached to the loaded side of the external relay
if necessary.
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.
SD-1EC
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.
* SK1, SK2: Surge absorbing parts
A
larm contact
Coil
Load
Power
suppl
y
External relay
(low voltage relay)
Power
suppl
y

4 How to Use 4-4. How to install
- 15 -
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 bolt fixing the lid and the main body with a tightening torque
of 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 or
where handling the detector involves dangers.
Regular maintenance of the detector must be performed.
Do not install the detector in a place where the machinery must be stopped when maintenance is
performed in its inside, where parts of the machinery must be removed to perform maintenance, or
where the detector cannot be removed because tubes or racks prevent access to it. Do not install
the detector in a place where maintenance involves dangers, for example, near a high-voltage
cable.
WARNING
Install the detector head in the specified direction.
Installing it in a wrong direction may cause abnormal readings.
Do not install the detector in a damp place where condensation occurs. Water drops formed
on the sensor may cause abnormal detection.
150mm
193mm

4 How to Use 4-4. How to install
- 16 -
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
Detector head installation direction

4 How to Use 4-5. Installation procedure
- 17 -
4-5. Installation procedure
<Attaching External Cable>
【ATEX/IECEx Specifications】
The ATEX / IECEx specification comes with adapter A (NPT 1/2) as
standard. Please prepare the Ex cable gland that is suitable for the adapter.
【TIIS Specifications】
Cable gland, Rubber seal, Washer and Eccentric washer are mounted on SD-1EC main body as shown
below.
Attach the parts :
Pass a Cable (e.g. CVVS) through the Cable gland, Eccentric washier, Washer, and Rubber seal, and
drawn 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.
Hexagon socket set screw
（M4×6）
Grounding screw
cable gland
mounting part
Adapter A
(NPT1/2)
Rubber seal
Cable gland
(G3/4)
Daub screw with grease
Washer
Eccentric washer
Cable
（CVVS etc.）
Main unit
Rubber seal
Washe
r
Eccentric washer
Cable gland
(G3/4)
Cable
g
land section view
Cable gland side
Washer side
Please mind direction of
Eccentric washer

4 How to Use 4-5. Installation procedure
- 18 -
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
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.