Riken Keiki SD-D58-AC User manual

PT2E-2152
Smart Transmitter/Gas Detector Head
SD-D58•AC
SD-D58•DC
(TYPE NCW)
Operating Manual

- 2 -
Operating Precautions
This detector head is a gas detector that detects combustible 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. This detector head may be interfered by gases other than the gas to be detected and vapors.
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 may trigger a false alarm.
3. This is a safety unit, not a control unit.
The alarm contact output of the detector head must be used for an external alarm lamp/buzzer, while
the alarm signal output must be used for an indicator or an external recorder. If these outputs are used
to control other units, we shall not be responsible for any malfunctions.
4. The gas sensing part of the gas detection sensor installed in this detector head is made of metal porous
sintered alloy permeated with an oxidation catalyst. If silicon or sulfide compounds are accumulated
on the surface of porous sintered alloy, the area of the gas sensing part becomes smaller, which may
result in a serious deterioration of its sensitivity.
For safety reasons, do not use the detector head under presence of silicon or sulfide compounds even
though their amount is very small.
5. For maintenance of the detector head, 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 gas
calibration are performed every six months in accordance with the regulations.

- 3 -
<Contents>
1. Outline of the Product...................................................................................................................... 4
1-1. Preface.................................................................................................................................. 4
1-2. Purpose of use...................................................................................................................... 4
1-3. Definition of DANGER, WARNING, CAUTION, and NOTE.................................................. 4
1-4. Method of confirmation for standards and explosion proof specification.............................. 5
2. Important Notices on Safety............................................................................................................ 6
2-1. Danger cases........................................................................................................................ 6
2-2. Warning cases ...................................................................................................................... 7
2-3. Precautions ........................................................................................................................... 8
2-4. Safety information................................................................................................................. 9
3. Product Components..................................................................................................................... 11
3-1. Main unit and standard accessories ................................................................................... 11
3-2. Names and functions for each part..................................................................................... 13
3-3. Block diagram ..................................................................................................................... 17
4. How to Use.................................................................................................................................... 19
4-1. Before using the gas detector............................................................................................. 19
4-2. Precautions for installation sites ......................................................................................... 19
4-3. Precautions for system designing....................................................................................... 20
4-4. How to install....................................................................................................................... 22
4-5. How to wire ......................................................................................................................... 23
4-6. How to tube......................................................................................................................... 30
5. How to Operate ............................................................................................................................. 31
5-1. Preparation for start-up....................................................................................................... 31
5-2. Basic operating procedures ................................................................................................ 31
5-3. How to start the gas detector head..................................................................................... 32
5-4. Modes ................................................................................................................................. 33
5-5. Maintenance mode (User mode) ........................................................................................35
5-6. How to exit .......................................................................................................................... 38
6. Operations and Functions ............................................................................................................. 39
6-1. Gas alarm activation ........................................................................................................... 39
6-2. Fault alarm activation.......................................................................................................... 40
6-3. Low flow rate abnormalities ................................................................................................ 40
6-4. External output operation.................................................................................................... 41
6-5. Other functions.................................................................................................................... 43
7. Maintenance.................................................................................................................................. 44
7-1. Maintenance intervals and items ........................................................................................ 44
7-2. Maintenance node (Regular maintenance mode) .............................................................. 46
7-3. Gas calibration Method....................................................................................................... 54
7-4. How to maintain flow sensor............................................................................................... 60
7-5. Parts replacement............................................................................................................... 61
8. Storage, Relocation and Disposal................................................................................................. 62
8-1. Procedures to store the gas detector or leave it for a long time......................................... 62
8-2. Procedures to relocate the detector or use it again............................................................ 62
8-3. Disposal of products ........................................................................................................... 62
9. Troubleshooting............................................................................................................................. 63
10. Product Specifications................................................................................................................. 65
10-1. List of specifications.......................................................................................................... 65
10-2. Detection principle ............................................................................................................ 69
11. Definition of Terms....................................................................................................................... 71

1. Outline of the Product 1-1. Preface
- 4 -
1
1. Outline of the Product
1-1. Preface
Thank you for choosing our smart transmitter/gas detector head SD-D58 (TYPE NCW). Please check that
the model number of the product you purchased is included in the specifications in this manual.
This manual explains how to use the detector head and its specifications. It contains information required
for using the detector head 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 indicator/alarm unit.
1-2. Purpose of use
The detector head is a fixed type detector head that detects leak of combustible gases and that
performs the alarm activation when the gas concentration is over the setting value.
The detector head is a safety unit, not an analyzer or densitometer which performs
quantitative/qualitative analysis/measurement for gases. You must understand the features of the
indicator/alarm unit before using it, so that you can use it properly.
The detector head detects abnormalities in the air caused by the presence of gases or other reasons
(leak) with the built-in gas sensor after drawing with the built-in pump. Then it shows the concentrations
of detected gases on the seven-segment LED.
The detector head has a built-in alarm contact and can be used either as a gas alarm, fault alarm, or
common (gas, fault) alarm.
This detector head has a built-in low flow rate detection function which triggers a fault alarm when the
flow rate is under a certain amount.
The detector head outputs gas concentration in 4 to 20 mA.
There are two types of power supply specifications for this series.
SD-D58(TYPE NCW)•AC AC power supply specifications: 100 - 110 VAC
SD-D58(TYPE NCW)•DC DC power supply specifications: 24 VDC
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
- 5 -
1-4. Method of confirmation for standards and
explosion proof specification
This detector head has different specifications depending on types of standards and/or explosion-proof
certification. Check the specification of the detector head
before using this. When using the one with CE marking specification, see the Declaration of Conformity at
the end of this operating manual. The specifications of the detector head can be confirmed by the attached
nameplate as shown below.
Example nameplate for ATEX CE marking specification Example nameplate for TIIS specification
(DC power supply specifications only) (AC/DC power supply specifications)
CE mark
Certificate of
model test
Ex mark

2. Important Notices on Safety 2-1. Danger cases
- 6 -
2
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 try to repair the explosion-proof structure joint surface.
Do not open the lid when applying current. When opening the lid, wait at least 5 minutes after
shutting down the power.
Do not attempt to repair the detector head by the user.
For the lid, use hexagon socket head bolts specified by RIKEN KEIKI.
Always keep the driving part lid closed during use (except for maintenance).

2. Important Notices on Safety 2-2. Warning cases
- 7 -
2-2. Warning cases
WARNING
Power supply
Before turning on the detector head, 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 head, check the protective functions for defects. When seeming defects
are found in the protective functions, such as protective grounding, do not start the detector head.
External connection
Before connecting the detector head to 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 other 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 judgement.
Do not use the low flow rate alarm function under the presence of silicon
Silicon may accumulate on the sensing part of the flow sensor, which can result in malfunction.
Do not use the low flow rate alarm function under the presence of corrosive gas
Corrosive gas (chlorine, sulfur, acid, alkaline, halogen) may corrode the flow sensor, which can
result in malfunction.
Do not use the low flow rate alarm function under the presence of high-concentrated gas
Under the presence of high-concentrated combustible gas over the lower explosive limit, the flow
sensor may be overheated, which can result in malfunction.

2. Important Notices on Safety 2-3. Precautions
- 8 -
2-3. Precautions
CAUTION
Do not use a transceiver or other radio wave transmitting device near the detector head.
Radio wave from a transceiver etc. near the detector head or its cables may disturb commands. 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 head, wait for five seconds or more before doing it.
Restarting the gas monitor within five seconds may cause errors.
Do not use the external output of the detector head to control other units.
This is not a control unit. It is not allowed to use the external output of the detector head to control
other units.
Do not disassemble/modify the detector head, or change the settings if not necessary.
Disassembling/Modifying the detector head will invalidate the warranty of the performance.
Changing the settings without understanding the specifications may cause alarm malfunctions.
Please use the detector head 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 head without performing maintenance will deteriorate the sensitivity of the sensor,
thus resulting in inaccurate gas detection.
Use the low flow rate alarm function only under the atmosphere of air or nitrogen.
The flow sensor measures the change of radiation amount caused by air current.
Different air type has a different radiation characteristic, which can result in malfunction.
When using the low flow rate alarm function, use any filter depending on the operating environment.
Otherwise dust and/or mist can cause clogging on the flow sensor, which can result in malfunction.
Set a dust filter and/or mist separator on the upstream side of tubing depending on the operating
environment.

2. Important Notices on Safety 2-4. Safety information
- 9 -
2-4. Safety information
Observe the followings to maintain an explosion-proof system.
Outline of the product
This detector head is a fixed type smart transmitter/gas detector head which outputs a signal of 4 - 20
mA. This is used to detect the target gas around a gas detection controller, storage device, or
programmable controller.
It has one contact and is triggered for gas alarm or fault, or for both depending on the setting.
<ATEX Specifications>
Specifications
(Explosion-proof structure) Flame-proof enclosures "d"
(Group) Ⅱ
(Category) 2G
(Explosion-proof class) Ex db ⅡB+H2 T4
(Protection level) Gb
(Ambient temperature) -20 - +53°C
(Rating)
Power supply
24 Vdc(Typ.)
External signal 4-20 mA
24 VDC 22 mA
Detecting element power output: 3.0 VDC 430 mA or 5.0 VDC 200 mA
Flow rate element power output: 2.0 VDC 170 mA
Transmission signal output 24 VDC 25mA
Contact output 250 VAC 0.5 A (resistant load)
30 VDC 0.5 A (resistant load)
(Applied standards) EN 60079-0: 2012, EN 60079-1: 2014
Installation
[SD-D58(TYPE NCW)•DC]
GND
Sig+
RLY
GND
Sig+
RLY
Indicator etc.
24V
GasDetector (SD‐D58・DC)
Hazardous Location
(Zone1)
Nonhazardous Location
InstallationDiagram
CVVSCable
24V
Connection
Hazardous location (Zone1)
Gas detector
(SD-D58(TYPE NCW)•DC)
Non-hazardous
location
Indicator/alarm
system, etc.

2. Important Notices on Safety 2-4. Safety information
- 10 -
<TIIS specifications>
Specifications
(Explosion-proof structure) Flame-proof enclosures
(Explosion-proof class) Ex d ⅡB+H2 T4
(Ambient temperature) AC specification: -20 - +50°C
DC specification: -20 - +53°C
(Rating)
Power supply
AC specification: 100 - 110 VAC
50/60 Hz 120 mA
DC specification: 24 VDC 360 m A
Detecting element power output: 3.0 VDC 430 mA or 5.0 VDC 200 mA
Flow rate element power output: 2.0 VDC 170 mA
Transmission signal output 24 VDC 25 mA
Contact output 250 VAC 0.5 A (resistant load)
30 VDC 0.5 A (resistant load)
(Applied standards) JNIOSH-TR-NO.43 (2008)
Installation
[SD-D58(TYPE NCW)•AC] [SD-D58(TYPE NCW)•DC]
CVVSCable
Sig+
Sig‐
RLY
Sig+
Sig‐
RLY
Indicator etc.
ACPower
L
N
PE
GasDetector (SD‐D58・AC)
Hazardous Location
(Zone1)
Nonhazardous Location
InstallationDiagram
pump
Hazardous location (Zone1)
Gas detector
(
SD-D58
(
TYPE NCW
)
•AC
)
Non-hazardous
location
Connection
Indicator/alarm
system, etc.
GND
Sig+
RLY
GND
Sig+
RLY
Indicator etc.
24V
GasDetector (SD‐D58・DC)
Hazardous Location
(Zone1)
Nonhazardous Location
InstallationDiagram
CVVSCable
24V
Connection
Hazardous location (Zone1)
Gas detector
(SD-D58(TYPE NCW)•DC)
Non-hazardous
location
Indicator/alarm
system, etc.

3. Product Components 3-1. Main unit and standard accessories
- 11 -
3
3. Product Components
3-1. Main unit and standard accessories
<Main Unit> (including a cable gland)
<Standard Accessories>
Operating manual
Dedicated handling lever······ 1 pc
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
Hex key wrench Included the same number as the certificate of test.
Dust elimination filter with a flow monitor ······1 pc
Gas outlet
Display
Gas outlet
4-φ7
(for M6)

3. Product Components 3-1. Main unit and standard accessories
- 12 -
CAUTION
Use the supplied dedicated control key to operate the detector head. 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.

3. Product Components 3-2. Names and functions for each part
- 13 -
3-2. Names and functions for each part
<Display>
(1) MENU/ESC key Used to enter the maintenance mode.
It is also used to cancel in a specific mode.
(2) SET/ALM 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) ALM 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 head.
(8) L range lamp L range lamp. It lights when the gas concentration is in the range of
the L range.
(9) H range lamp H range lamp. It lights when the gas concentration is in the range of
the H range.
(10) Concentration
value display Display the gas concentration and so on.
NOTE
Also the nameplate on the front side of the detector shows the precautions to be taken for explosion-proof
performances. Read these precautions as well as "2. Important Notices on Safety".
(10)Concentration
value display
(5)Power lamp (6)Alarm lamp (7)Fault lamp
(1)MENU/ESC key
(2)SET/ALM key (4)key
(3)key
(8)L range lamp (9)H range lamp

3. Product Components 3-2. Names and functions for each part
- 14 -
<Inside> (Electric circuit part)
(1) Terminal plate (for power input) Power input terminal plate.*1
(2) Terminal plate
(for contact/transmission output)
Terminal plate for alarm contact and gas
concentration signal output.*2
(3) Power switch Power switch of the detector head.
(Only in SD-D58 (TYPE NCW)•AC)
(4) Grounding terminal Terminal used when the protective grounding is
performed. (M4x6)
(5) Fuse Fuse for the main power supply.
(Only in SD-D58 (TYPE NCW)•AC)
*1 Only in SD-D58 (TYPE NCW)•AC. The power input terminal plate of SD-D58 (TYPE NCW)•DC is
shared with the terminal plate for contact/transmission output.
For details, see "4-5. How to wire <terminal diagram>".
*2 With SD-D58 (TYPE NCW)•DC, this is a terminal plate for power input and contact/transmission
output.
For details, see "4-5. How to wire <terminal diagram>".
(5) Fuse
(1) Terminal plate
(for power input)
(2)Terminal plate
(for contact/
transmission
output)
(3) Power switch
(4) Grounding terminal

3. Product Components 3-2. Names and functions for each part
- 15 -
NOTE
Loosen the electric circuit part lid.
The electric circuit shown above is located on the far side when the electric circuit part lid and the
display unit are removed.
After the use, tighten the screws firmly until they are hidden to fix the lid and make sure the "TOP"
display comes to top.
Open
Closed
Electric circuit
part lid
Display unit

3. Product Components 3-2. Names and functions for each part
- 16 -
<Inside> (Driving section)
(1) Gas sensor Sensor to detect gas.
(2) Flow sensor Sensor to detect the low flow rate.
(3) Pump Pump to draw gas.
NOTE
Loosen the hexagon socket head bolts located at the four
corners of the driving part lid.
The driving part shown above is located inside when the
driving part lid is removed.
Hexagon socket head bolts with a grade of A2-70 should
be used.
(2) Flow sensor (3) Pump
(1) Gas sensor
Driving part lid

3. Product Components 3-3. Block diagram
- 17 -
3-3. Block diagram
<Electric Diagram>
SD-D58 (TYPE NCW)•AC
Gas sensor
Controller
(CPU)
POWER OUTPUT
(
24 VDC
)
Power supply part
Gas alarm contact
(ALARM )
Contact activation
• De-energized
(De-energized at a
normal state)
• ON-ALARM
(Closed contact at an
alarm state)
Alarm contact controller
Display
(POWER) (ALM) (FAULT)
Seven-segment LED
(four-digit)
Magnetic operation part
(MENU/ESC)()() (SET)
Transmitter
• 4–20 mA transmission
Flow sensor
POWER INPUT
(100 - 110 VAC)
Power supply part Suction pump

3. Product Components 3-3. Block diagram
- 18 -
<Electric Diagram>
SD-D58 (TYPE NCW)•DC
Gas sensor
Controller
(CPU)
Gas alarm contact
(ALARM)
Contact activation
• De-energized
(De-energized at a
normal state)
• ON-ALARM
(Closed contact at an
alarm state)
Alarm contact controller
Display
(POWER) (ALM) (FAULT)
Seven-segment LED
(four-digit)
Magnetic operation part
(MENU/ESC) () () (SET)
Transmitter
•4–20 mA transmission
Flow sensor
POWER INPUT (24 VDC)
Power supply part Suction pump

4. How to Use 4-1. Before using the gas detector
- 19 -
4
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 product must follow the operating
precautions.
Ignoring the precautions may damage the detector head, resulting in inaccurate gas detection.
4-2. Precautions for installation sites
Do not install the detector in a place with vibrations or shocks.
The detector head 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 you select installation sites, avoid a place where the detector head is exposed to water, oil or
chemicals.
Do not install the detector head in a place where the range of operating temperatures is exceeded.
The detector head must be installed in a stable place where the operating temperature is maintained and do
not change suddenly.
<ATEX specification> SD-D58 (TYPE NCW)•DC: -20 - +53°C
<TIIS specification> SD-D58 (TYPE NCW)•AC: -20 - +50°C / SD-D58•DC (TYPE NCW): -20 - +53°C
Do not install the detector head 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 head, or the detector head cannot adjust to sudden
changes in the temperature.
Keep the detector head (and its cables) away from noise source devices.
When selecting installation points, avoid a place where high-frequency/high-voltage devices exist.
CAUTION
This detector head is a precision device. Because the detector head may not provide the
specified performance in some places (environments), check the environment in the installation
site, and then take appropriate actions if necessary.
Because the detector head plays an important role for safety and disaster prevention, you must
install as many units of the detector head as needed 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 installation sites and the number of units
to be installed.

4. How to Use 4-3. Precautions for system designing
- 20 -
Do not install the detector head in a place where maintenance of the detector cannot be performed or
where handling the detector head involves dangers.
Regular maintenance of the detector head must be performed.
Do not install the detector head in a place where the equipment must be stopped when maintenance is
performed in its inside, where parts of the equipment must be removed to perform maintenance, or where
the detector head cannot be removed because tubes or racks prevent access to it. Do not install the
detector head in a place where maintenance involves dangers, for example, near a high-voltage cable.
Do not install the detector head in equipment which is not properly grounded.
Before installing the detector head in machinery, the machinery must be grounded properly.
Do not install the detector head in a place where other gases exist around it.
The detector head must not be installed in a place where other gases exist around it.
4-3. Precautions for system designing
Using a stable power supply
The external output and alarm contact of the detector head 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 system) , or take appropriate actions on the receiving side.
The detector head must be provided with the following power supply.
Power supply
voltage
SD-D58 (TYPE NCW)•AC: 100 - 110 VAC ±10% 50/60Hz: terminal voltage of the
detector head
SD-D58 (TYPE NCW)•DC: 24 VDC (21.6 - 26.4 VDC): terminal voltage of the detector
head
Allowed time of
momentary
blackout
SD-D58 (TYPE NCW)•AC:
Approx. less than 200 msec
(To recover from the momentary blackout for 200
milliseconds or more, restart the detector head.)
SD-D58(TYPE NCW)•DC:
Approx. less than 10 msec
(To recover from the momentary blackout for 10
milliseconds or more, restart the detector head.)
Example of actions
To ensure continuous operation
and activation, install a UPS
outside the pyrolyzer unit.
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.
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
head.