PT2E-17316

Smart Transmitter/Gas Detector Head

SD-D58・AC
SD-D58・DC(TYPE GP)(TYPE NC)
(TYPE NCW)(TYPE GP H)(TYPE NC H)

Operating Manual

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 and vapors other than the gas to be detected.
Please note that the alarm may be triggered by interference. In addition, it may be fluctuated byenvironmental (temperature, humidity, etc.) changes in the installation site.

2.

The alarm must be set within a range where the performance of the detector head 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 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 sensor installed in this detector head is made of metal porous sinteredalloy permeated with an oxidation catalyst.
If silicon or sulfide compounds are accumulated on the surface of porous sintered alloy, the area of thegas sensing part becomes smaller, which may results in serious deterioration of its sensitivity.
For safety reasons, do not use the detector head under the 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.

<Contents>
1.
1-1.
1-2.
1-3.
1-4.

Outline of the Product............................................................................................................... 1
Preface ..................................................................................................................................... 1
Purpose of use ......................................................................................................................... 1
Definition of DANGER, WARNING, CAUTION, and NOTE ...................................................... 2
Method of confirmation for Standards and Explosion proof specification ................................. 2

2.
2-1.
2-2.
2-3.
2-4.

Important Notices on Safety ..................................................................................................... 3
Danger cases ........................................................................................................................... 3
Warning cases .......................................................................................................................... 4
Precautions .............................................................................................................................. 5
Safety Information .................................................................................................................... 6

3.
3-1.
3-2.
3-3.

Product Components ............................................................................................................... 10
Main unit and standard accessories ......................................................................................... 10
Names and functions for each part........................................................................................... 12
Block diagram........................................................................................................................... 17

4.
4-1.
4-2.
4-3.
4-4.
4-5.
4-6.

How to Use .............................................................................................................................. 19
Before using the detector head ................................................................................................ 19
Precautions for installation points ............................................................................................. 19
Precautions for system designing............................................................................................. 20
How to install ............................................................................................................................ 23
How to wire .............................................................................................................................. 25
How to tube .............................................................................................................................. 33

5.
5-1.
5-2.
5-3.
5-4.
5-5.
5-6.

How to Operate ........................................................................................................................ 34
Preparation for start-up ............................................................................................................ 34
Basic operating procedures ...................................................................................................... 35
How to start the detector head ................................................................................................. 36
Modes ...................................................................................................................................... 36
Maintenance mode (User) ........................................................................................................ 38
How to exit ............................................................................................................................... 41

6.
6-1.
6-2.
6-3.
6-4.
6-5.

Operations and Functions ........................................................................................................ 42
Gas alarm activation................................................................................................................. 42
Fault alarm activation ............................................................................................................... 43
Low Flow Rate Abnormal Operations ....................................................................................... 43
External output operation ......................................................................................................... 44
Other functions ......................................................................................................................... 46

7.
7-1.
7-2.
7-3.
7-4.
7-5.

Maintenance ............................................................................................................................ 47
Maintenance intervals and items .............................................................................................. 47
Maintenance mode (Regular maintenance) ............................................................................. 49
Gas calibration method ............................................................................................................ 57
How to maintain flow sensor .................................................................................................... 64
Parts replacement .................................................................................................................... 65

8.
8-1.
8-2.
8-3.

Storage, Relocation and Disposal ............................................................................................ 67
Procedures to store the detector head or leave it for a long time ............................................. 67
Procedures to relocate the detector head or use it again ......................................................... 67
Disposal of products ................................................................................................................. 67

9.

Troubleshooting ....................................................................................................................... 68

10.
10-1.
10-2.

Product Specifications ............................................................................................................. 70
List of specifications ................................................................................................................. 70
Detection principle.................................................................................................................... 92

11.

Definition of Terms ................................................................................................................... 94

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-D58 series. Please check that themodel number of the product you purchased is included in the specifications on this manual.
This manual explains how to use the detector 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 detector head.
The detector head has five types of TYPE GP/TYPE NC/TYPE NCW and HART communication TYPE GP
H/TYPE NC H. In this manual, instructions of TYPE GP (such as an example of LED display) aredescribed as example.

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. Please fully understand the features of thedetector head before using it, so that it can be used properly.
 The detector head draws air with the built-in pump, and detects abnormalities in the air caused bypresence of gases or other reasons (leak) with the built-in gas sensor. The concentrations of detectedgases are displayed 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, orcommon (gas, fault) alarm.
 The detector head has a built-in low flow rate detection function and can trigger a fault alarm when theflow rate inside the tubing drops below a fixed rate.
 The detector head outputs gas concentration in 4 – 20 mA.
 SD-D58 series have two types of power supply specifications.
AC power specification 100 – 110VAC
SD-D58･AC
DC power specification 24VDC
SD-D58･DC
 TYPE GP H/TYPE NC H have HART communication function.

12 Important Notices on Safety

2-4. Safety Information

2-4. Safety Information
Necessary information for explosion proof construction of Model SD-D58・AC／SD-D58・DC.
The Model SD-D58・AC／SD-D58・DC 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/UKEX Specifications>Technical Data
(Protection Method)(Certificate numbers)(Group)(Category)(Type of Protection and Marking code)(Equipment Protection Level)(Ambient Temperature)(Electrical Data)
Supply voltage :Output signal :Relay : Contact output
Sensor power supply : Gas sensor
Flow sensor(Applicable Standard)

Flameproof enclosure “d”
DNV 21 ATEX 63457X
DNV 22 UKEX 25926X
II
2G
Ex db h ⅡB+H2 T4
Gb-20C to +53C
24 Vdc(Typ.)4 to 20 mA①DC24V 22mA ②DC24V 22mA with HART
DC30V or AC250V 0.5A
DC5.0V 200mA or DC3.0V 430mA
DC2.0V 170mA
EN IEC 60079-0 : 2018，EN 60079-1: 2014
BS EN IEC60079-0:2018, BS EN 60079-1:2014

Specific conditions of “X”-mark:Fasteners used for enclosure arefrom stainless steel property class A2-70.
Cable gland may not provide sufficient clamping. User shall provide additional clamping of the cable toensure that pulling and twisting isnot transmitted to the terminations.
Regarding ATEX specification, the measuring function according to Annex II paragraph 1.5.5 of the
Directive is not covered by this EU-type examination.
It shall comply with the requirements from the relevant European harmonized standards which provide
guidance on the performance of gas detection equipment and safety devices.
The measuring function according to schedule 1, paragraph 24 of the Regulation is not covered in this UKtype examination. It shall comply with the requirements from the relevant UK Designated Standards which
provide guidance on the performance of gas detection equipment.
The flameproof joints not intended to be repaired.
Enclosure made of Aluminum – Avoid impact or Friction in the equipment.

63 Product Components

3-2. Names and functions for each part

<Inside of the main unit> (Electric circuit section)(1) Terminal plate(for power supply)(5) Fuse(2) Terminal plate(for contact andtransmission)(3) Power switch(4) Grounding terminal

(1)
(2)
(3)
(4)
(5)

Terminal plate (for power supply)
Terminal plate(for contact and transmission)
Power switch
Grounding terminal
FusePower input terminal plate. *1 *2
Signal (contact and gas concentration) output terminal plate. *3
Power switch of the detector head. *1
Terminal for grounding. (M4×6)
Main power fuse. *1*1 Only SD-D58･AC/SD-D58･AC(TYPE H).
*2 The power input terminal plate of SD-D58DC/SD-D58･DC(TYPE H) are as common as terminal platefor contact and transmission output. See "4-5. How to wire <Figure of Terminal Plate>" for details.
*3 SD-D58･DC/SD-D58･DC(TYPE H) are the power input and terminal plate for contact and transmission
output. See "4-5. How to wire <Figure of Terminal Plate>" for details.

145 How to Operate

5-1. Preparation for start-up

5

How to Operate
5-1. Preparation for start-up
Before supplying power, read and understand the following precautions. Ignoring these precautions may
cause an electric shock or damage the detector head.
 Connect the detector head to a grounding circuit.
 Check that the wiring is connected to external device properly.
 Check that the power supply voltage is compliant with the specifications.
 Because the external contact may be activated during the adjustment, take measures to preventan activated contact from having influences on external device.

34

5 How to Operate

Mode
Detection mode

Maintenance mode
(User)

Maintenance mode
(Regularmaintenance)

5-4. Modes

Item
―

LED
displayGas
concent
rationDetails
Normal state.

ROM/SUM display

1-0

Zero adjustment
Setting display
Switches to regular
maintenance mode

1-1
1-2

Displays the program version and others.
This is not typically used by the user.
Performs the zero adjustment.
Displays various setting values.

1-3

Switches to the regular maintenance mode.

Test mode

2-0

Performs various tests.
2-0.0 Gas test
2-0.1 Alarm test
2-0.2 Fault alarm test
2-0.3 LED test
2-0.4 Memory test

Zero adjustment
Span adjustment
Zero/span
initialization

2-1
2-2

Performs the zero adjustment.
Performs the span adjustment.

2-3

Initializes zero/span values.

Environmental
setting

2-4Electrical setting
display

2-5

Flow sensor setting

2-6

Used for various environmental settings.
2-4.0 Heater voltage adjustment
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 Zero suppression pattern setting
2-4.6 Zero suppression value setting
2-4.7 Alarm contact specification setting
2-4.8 Energized/de-energized contact setting
2-4.9 Zero follower selection
2-4.A Maintenance mode external output
setting
2-4.B External output setting
2-4.C Alarm test external output setting
2-4.D Sensor operation start setting
2-4.E Password setting
2-4.F Sensor fault alarm pattern setting
2-4.U Double range external output setting*
Displays various electrical settings.
This is not typically used by the user.
2-6.0 Flow sensor heater voltage adjustment
2-6.1 Flow rate zero point setting
2-6.2 Low flow rate threshold value setting
2-6.3 Flow sensor zero point check2-6.4 Flow sensor output check2-6.5 Pump output check
2-6.6 Flow sensor initialization
2-6.7 Flow sensor operation start setting
2-6.8 Low flow rate alarm delay time setting
2-6.9 Flow sensor function ON/OFF setting
Displays various settings of the flow sensor.
This is not typically used by the user.

Flow sensor various
2-7
setting display
Switch to factory2-8
Not used.
mode
Switch to user mode 2-9
Returns to the user mode.
*There is “2-4.U Double range external output setting” only for TYPE NCW.
37

5 How to Operate

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

1-1
Press the SET key.

PW
◎

A
○

F
○

L
●

H
○

◎

○

○

●

○

↓
Current concentration value display
Press the SET key to perform thezero adjustment.

↓
Under zero adjustment (CAL. isdisplayed)
Wait for a while until the adjustment
is completed.

1- 1
↓
1.0
↓

◎

○

○

●

○

↓
Zero adjustment completed
It automatically returns to 1-1 after
PASS is displayed.

LED

CAL.

↓
◎

○

○

●

○

PASS

↓
Return to 1-1.
* If the zero adjustment failed, it
automatically returns to 1-1 after
FAIL is displayed.

◎

○

○

●

○

FAIL

↓
Return to 1-1.

* Only for TYPE NCW there are L range lamp and H range lamp.

NOTE
If the zero adjustment failed since the zero point was significantly fluctuated from around zero, it returns
to 1-1 after FAIL rather than PASS is displayed. In this case, the zero adjustment has not been
completed.

39

5 How to Operate

5-5. Maintenance mode (User)<Setting Display "1-2">
PW
◎

A
○

F
○

L
●

H
○

Alarm setpoint display
Example: 25% LEL

◎

○

○

●

○

Alarm delay time(seconds) display
Example: 2 seconds

◎

○

○

●

○

Zero suppression value
display
Example: 2.0% LEL

◎

○

○

●

○

Alarm contact specification
display
Example:AL
setting(Contact activation due togas alarm only)

◎

○

○

●

○

1-2.
Press the SET key.

LED

1- 2
↓
25.0
▲↓↑▼
2
▲↓↑▼
2.0
▲↓↑▼
AL.
↓↑▼

AL.:

The contact is activated dueto the gas alarm.
FAU.:
The contact is activated dueto the fault alarm.
A. or F.: The contact is activated dueto the gas alarm or the fault
alarm.

▲
Low flow rate delay time(seconds) display
Example: 15 seconds

◎

○

○

●

○

Flow sensor function
ON/OFF display
Example: ON setting

◎

○

○

●

○

１５
▲↓↑▼
ON
▲↓↑▼
To Alarm Setpoint
Display* Only for TYPE NCW there are L range lamp and H range lamp.

40

ON:
OFF:

Function ON
Function OFF

6 Operations and Functions

6-1. Gas alarm activation

6

Operations and Functions
6-1. Gas alarm activation
Gas alarm: Triggered when the concentration of detected gas reaches or exceeds the alarm setpoint value.
<<Auto-Reset>>

NOTE
The alarm setpoint is factory-set. Although the alarm delay time (standard: 2 seconds) works in thedetector head to prevent a false activation, it can be cancelled if not needed.

<Display Operation>
Gas concentration display
In case of over the detection range (Over Scale), "∩∩∩∩" is displayed on the LED.
Power indicator lamp (POWER: Green)
During normal operation, this lights up continuously.
Alarm indicator lamp (ALM: Red)
It lights up when the alarm setpoint value is reached to or exceeded.
L range lamp (Red)
Only for TYPE NCW there are L range lamp.
It lights when gas is detected in the low concentration range.
H range lamp (Yellow)
Only for TYPE NCW there are H range lamp.
It lights up when it switches to the high concentration range beyond the measurement range on the low
density side.

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

Alarm setpoint value
ConcentrationTime
ALM (alarm) lamp lights up
Alarm contact outputs (*1)
*1: Depending on the specifications
for the alarm contact

Alarm delay time (2 seconds)

42

6 Operations and Functions

6-2. Fault alarm activation<Response to Gas Alarm>
A gas concentration value exceeds the alarm setpoint
When a gas alarm is triggered, take actions in accordance with your management rules of gas alarm.
Normally, take the following actions.
 Check the reading of the detector head.

NOTE
If a gas leak is momentary, the reading may already have dropped when checking it. In addition, when
the alarm is triggered by noise or other incidental conditions other than a gas, the reading may havealready dropped.
 Based on your management rules of gas alarm, no one can be allowed to access the monitored zone toensure safety.
 If the gas concentration display continues to be displayed, close the main valve of the gas, and thencheck that the gas concentration reading dropped.
 Access the gas leak point, equipped with a protective gear to avoid dangers caused by possibly
remaining gases, and check whether gases remain or not by using a portable gas detector.
 Check that the point is free from dangers, and take actions to fix the gas leak.

6-2. Fault alarm activation
A fault alarm is triggered when the detector head detects abnormalities. After a fault alarm is triggered, thefault lamp (yellow) lights up and an error message is displayed on the LED. Determine the causes and takeappropriate actions.
After the detector head is successfully returned from the fault, it restarts with the process normally
performed right after it is turned on (initial clear).
If the detector head has problems and is repeatedly malfunctioning, contact RIKEN KEIKI immediately.

NOTE
For information on malfunctions (error messages), see "9. Troubleshooting".

6-3. Low Flow Rate Abnormal Operations<Contact Activation>
The contact is activated when the output value of the low flow sensor drops below the alarm setpoint (if theflow sensor function ON is selected).
The contact activation is auto-reset when the flow rate exceeds a certain level.

Flow sensor
output value

Alarm setpoint value

Time
FAULT lamp lights up
Fault alarm contact outputs (*1)
*1: Depending on thespecifications for the alarm
contact

Alarm delay time (15 seconds)

43

7 Maintenance7-1. Maintenance intervals and items

7

MaintenanceThe detector head is an important instrument for the purpose of safety.
To maintain the performance of the detector head and improve the reliability of safety, perform a regular
maintenance.

7-1. Maintenance intervals and items
 Daily maintenance:
 Monthly maintenance: Regular maintenance:

Perform maintenance before beginning to work.
Perform maintenance on the alarm circuit (alarm test) once a month.
Perform maintenance once or more for every six months to maintain theperformance as a safety unit.

Maintenance item

Maintenance content

Power supply check
Concentration
display check

Check that the power lamp lights up.
Check that the concentration display
value is zero. When the reading isincorrect, perform the zero adjustment
after ensuring that no other gases exist
around it.
Check the alarm circuit by using thealarm test function.
Perform the sensitivity calibration byusing the calibration gas.
Check the gas alarm by using thecalibration gas.
Check the flow sensor by using the testpump.

Alarm test
Span adjustment
Gas alarm check
Flow sensor check

Daily
maintenance

Monthly
maintenanceRegularmaintenance













－





－

－



－

－



－

－



<About Maintenance Services> We provide services on regular maintenance including span adjustment, other adjustments andmaintenance.
To make the calibration gas, dedicated tools, such as a gas cylinder of the specified concentration andgas sampling bag must be used.
Our qualified service engineers have expertise and knowledge on the dedicated tools used for services,along with other products. To maintain the safety operation of the detector head, please use ourmaintenance service.

47

7 Maintenance7-1. Maintenance intervals and items

 The followings are typical maintenance services. For more information, please contact RIKEN KEIKI.
Main services
Power supply
check

:

Concentration
display check
Flow rate
check:

Filter check:

Alarm test::

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 by using the zero gas.
Performs the zero adjustment (fresh air adjustment) if the reading is incorrect.
Checks the flow rate indicator to find abnormalities.
Checks the flow rate by using an external flow meter to verify the correctness of theflow rate indicator on the device. If the flow rate is incorrect, performs the flow rateadjustment.
Checks the dust filter for dust or clogging.
Replaces a dirty or clogged dust filter.
Inspects the alarm circuit by using the alarm test function.
 Checks the alarm lamps. (Checks activation.)Spanadjustment
Gas alarmcheck: 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 the alarm activation when the alarm setpoint isreached) Checks the delay time. (Checks time to delay until the alarm is triggered.)

Cleaning andrepair ofdevice(visualdiagnosis)
Deviceoperation
check
Replacementof consumable
parts

:

 Checks the alarm lamps. (Checks 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 head,cleans and repairs such parts of the device.
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.

48

7 MaintenanceUser mode
In "1-3.", press the SET key.

7-2. Maintenance mode (Regular maintenance)
PW
◎

A F
○ ○

L
●

H
○

↓
Then hold down the SET key
again for three seconds.

◎

○

○

●

○

◎

○

○

●

○

↓
While the ESC key ispressed, the LED displays"....".

LED

1- 3
↓
‐‐‐‐
↓
‐.‐.‐.‐.

↓Regularmaintenance mode
2-0. Test mode
Performs various tests.

↓
◎

○

○

●

○

2- 0
↓↑▼
2- 1
▲↓↑▼

→
SET

Test mode
⇒P51

→
SET

Zero adjustment
⇒P56

→
SET

Span adjustment
⇒P57

→
SET

Environment
setting⇒P55▲

2-1. Zero adjustment
Performs the zeroadjustment.

◎

○

○

●

○

2-2. Span adjustment
Performs the span
adjustment.

◎

○

○

●

○

2- 2
↓↑▼
2- 3

▲
2-3. Zero/span initialization
Initializes the zero/span
adjustment after the sensor
is replaced.

◎

○ ○

●

○

↓↑▼
2- 4

▲
2-4. Environmental setting
Sets various operations andfunctions.

◎

○

○

●

○

"2-4.0" and "2-4.3" to "24.F" are factory-set. They
are not typically used by
the user.
2-5. Various electricalsetting display
Shows various electricalsettings. This is not used by
the user.

↓↑▼

▲

◎

○

○

●

○

2- 5
↓↑▼

▲
* Only for TYPE NCW There are L range lamp and H range lamp.

50

7 Maintenance2-6. Flow sensor setting
Sets the flow sensor
functions.

7-2. Maintenance mode (Regular maintenance)

◎

○

○

●

2- 6

○

"2-6.0," "2-6.5" to "2-6.6,"
and "2-6.8" to "2-6.9" arefactory-set. They are nottypically used by the user.
2-7. Flow sensor setting
display
Displays settings of the flow
sensor. This is not used by
the user.

▲

◎

○

○

●

→
SET

Flow sensor setting
⇒P60

→
SET

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

↓↑▼
2- 7

○

↓↑▼
2- 8
▲↓↑▼
▲

2-8.
Enters the factory mode.
This is not used by the user.

◎

○

○

●

○

2-9.
Returns to the user mode.

◎

○

○

●

○

2- 9
↓↑▼

▲

To 2-0. Test mode
* Only for TYPE NCW There are L range lamp and H range lamp51

7 Maintenance7-2. Maintenance mode (Regular maintenance)<Memory Test "2-0.4">
PW
◎

A
○

F
○

L
●

H
○

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
the diagnosis, PASS is displayed. Press
the SET key to go back to the originalstate.

◎

○

○

●

○

2-0.4
Press the SET key.

↓

LED

2-0.4
↓
StA.
↓
CAL.
↓
PASS
↓
To 2-0.4* Only for TYPE NCW There are L range lamp and H range lamp.

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.

55

7 Maintenance7-2. Maintenance mode (Regular maintenance)<Environmental Setting "2-4">
Set various operations and functions in the environmental setting.
<<Environmental Setting 1>> PW
A F
L
H
2-4. Environmental setting◎ ○ ○ ● ○Press the SET key.

↓
2-4.0
They are factory-set andnot typically used by the
user.

◎

○

○

●

LED

2- 4
↓

○

2-4.0
↓↑▼
2-4.1
▲

2-4.1 INHIBIT setting
Set Inhibit.
Select either ON/OFF, andthen press the SET key toconfirm the selection.
When ON is selected, in thedetection mode InHI. and
0.0 (gas concentration
value) are displayed on the
LED alternately. As a result,an alarm is not triggered toexternal device.

◎

2-4.2 Alarm setpoint setting
Set the alarm setpoint.

◎

2-4.3 to 2-4.U
They are factory-set andnot typically used by the
user.

○

○

●

○

ON
↓↑▼

▲

○

○

●

○

⇔
2-4.2
SET
▲↓↑▼
◎ ○ ○ ● ○2-4.3～2-4.U▲↓↑▼<Alarm Setpoint Setting "2-4.2">
PW
◎

A
○

F
○

L
●

H
○

◎

○

○

○

●

↓
Alarm setpoint setting
Change the value bypressing 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.)

OFF
▲↓↑▼

To 2-4.0* Only for TYPE NCW There are L range lamp and H range lamp.
* There is "2-4.U double range external output setting" only for TYPE NCW.

2-4.2
Press the SET key.

⇔
SET

LED

2-4.2
↓
25.0
↓

Return to 2-4.2.
* Only for TYPE NCW There are L range lamp and H range lamp.

NOTE
A value exceeding 60% LEL cannot be set.

56

Alarm setpoint
setting ⇒P55

7 Maintenance7-3. Gas calibration method

In cases TYPE NCW
2-2
Press the SET key.

PW
◎

A
○

F
○

L
●

H
○

◎

○

○

●

○

◎

○

○

●

○

↓
Gas introduction
Introduce a gas, and then press the
SET key when the reading isstabilized.
*In case of less than 10% F.S., thiscannot be set.

↓
L span adjustment
Because the reading will be fixed,
adjust the introduced gas
concentration by pressing the  or 
key.
After adjusting the value, press the
SET key.

↓
L span adjustment completed
It automatically returns to H span after
PASS is displayed.

LED

2- 2
↓
9.5
↓
8.0

↓
◎

○

○

●

○

PASS

↓
Return to H span
*If the span adjustment failed, it
automatically returns to H span after
FAIL is displayed.

◎

○

○

●

○

FAIL

↓
Return to H span
Gas introduction
Introduce a gas, and then press the
SET key when the reading isstabilized.
*In case of less than 10% F.S., thiscannot be set.

◎

○

○

○

●

↓
H span adjustment
Because the reading will be fixed,
adjust the introduced gas
concentration by pressing the  or 
key.
After adjusting the value, press the
SET key.

◎

○

○

○

●

◎

○

○

○

●

↓
H span adjustment completed
It automatically returns to 2-2 after
PASS is displayed.

75.0
↓
50.0

↓

59

PASS

7 Maintenance7-3. Gas calibration method↓
Return to 2-2.
*If the span adjustment failed, it
automatically returns to 2-2. after FAIL
is displayed.

◎

○

○

○

●

FAIL

↓
Return to 2-2.
* Only for TYPE NCW There are L range lamp and H range lamp.

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

60

7 Maintenance7-4. How to maintain flow sensor

7-4. How to maintain flow sensor
Remove the pump.

↓
2-6.3 Flow sensor zero point check
Press the SET key.

PW
◎

A
○

F
○

L
●

H
○

◎

○

○

●

○

↓
Flow sensor zero point checkcompleted
It automatically returns to 2-6.3 after
PASS is displayed.
* If the zero point check of the flow
sensor fails, it automatically returns
to 2-6.3 after FAIL is displayed.

LED

2- 6.3↓PASS↓
Return to 2-6.3.

↓↓

Install the test pump.

↓
2-6.4 Flow sensor output check
Check the flow sensor output during
the pump operation.

PW
◎

A
○

F
○

L
●

H
○

↓
Flow sensor output checkcompleted
It automatically returns to 2-6.4 after
PASS is displayed.
* If the output check of the flow
sensor failed, it automatically
returns to 2-6.4 after FAIL isdisplayed.

LED

2-6.4
↓

◎

○

○

●

○

PASS

↓
Return to 2-6.4.

* Only for TYPE NCW There are L range lamp and H range lamp.

64

7 Maintenance7-5. Parts replacement<Replacement of Regular Replacement Parts>
List of recommended regular replacement parts
Name

Maintenanceintervals

Replacement
intervals (year)

Quantity(pieces/unit)

Remarks

AC/DC converter(Only SD-D58･AC)

6 months

3 - 6 years

1※

Flow sensor

6 months

2 years

1

※

Tubes

6 months

3 - 8 years

1※

Pump unit

6 months

1 - 2 years

1※

Chamber assembly

6 months

3 - 8 years

1※

Sensor cap assembly

6 months

3 - 8 years

1※※After the part is replaced, the operation must be checked by a qualified service engineer.
For the stable operation of the detector and safety, ask a qualified service engineer to take care of
replacement of the parts whose operation must be checked. Please contact our sales department.

NOTE
The above replacement intervals are recommendation only. The intervals may change depending on theconditions such as the operating environment. These intervals do not mean the warranty periods either.
The result of the regular maintenance may determine when to replace the parts.

66

9 Troubleshooting

9

Troubleshooting
The Troubleshooting does not explain the causes of all the malfunctions which occur on the detector head.
This simply helps to find the causes of malfunctions which frequently occur. If the detector head shows asymptom which is not explained in this manual, or still has malfunctions even though remedial actions aretaken, please contact RIKEN KEIKI.

<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.

Actions
Connect the wiring properly.
Connect the terminal plate properly.

Abnormalities/momentar
y blackout of power
supply system

Provide 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 head and related
devices around it.

―Disturbances by sudden
surge noise,etc.

Turn off and restart the detector head.
If such a symptom is observed frequently, takeappropriate measures to eliminate the noise.

The sensor is notconnected or
improperly connected.
Zero drift caused byenvironmental changes
or aging deterioration
becomes out of therange of zero follower.
Faults of the sensor―

Low flow rateabnormality
E-5

Systemabnormalities
E-9

The flow rate is low.
Faults of the flow sensor
Abnormalities of ROM,
RAM, or EEPROM insideof the detector head68

Check if the cable is securely fastened to theterminal plate.
Perform the zero adjustment. If the symptom
persists after the zero adjustment, replace thesensor with a new one.
Replace the sensor with a new one.
The possible causes are deterioration or clogging
of the pump or clogging of the tube. Check the flow
rate.
Replace the sensor with a new one.
Please contact RIKEN KEIKI.

9 Troubleshooting<Abnormalities of Readings>
Symptoms

CausesDrifting of sensor
outputPresence ofinterference gas

The reading rises (drops)
and it remains so.
Slow leakA gas alarm is triggered
despite of no gas leakand no otherabnormalities at thedetection point.

Slow response
Span adjustment
impossible

Actions
Perform the zero adjustment.
Disturbances by interference gases, such as solvents,
cannot be eliminated completely. For information on
actions, such as removal filter, please contact RIKEN
KEIKI.
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.

Environmental
changes

Perform the zero adjustment (AIR adjustment).

Presence ofinterference gas

Disturbances by interference gases, such as solvents,
cannot be eliminated completely. For information on
actions, such as removal filter, please contact RIKEN
KEIKI.

Disturbance bynoiseTurn off and restart the detector head.
If such a symptom is observed frequently, takeappropriate measures to eliminate the noise.

Sudden change inthe environment

When the environment (temperature, etc.) changes
suddenly, the detector head cannot adjust to it and isaffected by it. In some cases, the detector head triggers
an indication alarm.
Because the detector head cannot be used undersudden and frequent environmental changes, you musttake any preventive actions to eliminate them.

Deteriorated sensor
sensitivity
Improper calibration
gas concentration
Sensor sensitivity
deterioration

Replace the sensor with a new one.
Use the proper calibration gas.
Replace the sensor with a new one.

69

10 Product Specifications

10-1. List of specifications

10

Product Specifications
10-1. List of specifications[SD-D58・DC(TYPE GP)/ SD-D58・DC(TYPE NC)]＜ATEX/UKEX Specifications＞
Model
Type
Detection principle
Detection gas
Display
Detection range
Resolution
Alarm setpoints
Detection method
Flow rate
Power display
External output
Alarm accuracy (under thesame conditions)
Response time (under thesame conditions)
Gas alarm typeGas alarm display
Gas alarm patternFault alarm/self diagnosis
Fault alarm display
Fault alarm pattern
Alarm contact
Contact capacity
Transmission system

SD-D58・DC
TYPE GPTYPE NC
Catalytic combustion typeNew ceramic typeCombustible gas
Seven-segment LED (four-digit)
0 - 100% LEL
Depend on detection gas
0.5% LEL
Depend on detection gas
25% LEL [standard setting value]
Depend on detection gas
Sample-drawing
1.0 L/min or more (at maximum suction pressure of 5.0 kPa <gaugepressure>)
POWER lamp on (green)
Gas concentration signal/alarm contact (gas alarm or fault alarm, gas/fault
common alarm)
Within ±25% to the alarm setpoint value
Within 30 seconds after providing the gas 1.6 times the alarm setpoint(excluding delay in the tube)
One-step alarm (H)ALM lamp on (red)Non latching (Auto-reset)
System abnormalities/sensor abnormalities/low flow rates
FAULT lamp on (yellow)/detail display
Non latching (Auto-reset)
No-voltage contact 1a, de-energized (energized in response to an alarm) or
energized (de-energized in response to an alarm)
30 VDC - 0.5 A (resistant load)
Three-wire analog transmission(in common with power supply<power
supply,signal,common>)4 - 20 mA DC (no-insulation/load resistance under 300 Ω)Power/contact/transmission Shielded cable of CVVS, etc. (1.25mm2 or 2.0mm2) - 3-core (when the contact
cable
is not used)
Shielded cable of CVVS, etc. (1.25mm2 or 2.0mm2) - 5-core (when the contact
is used)Transmission specifications70

10 Product Specifications

10-1. List of specifications

Transmission distanceLess than 250m in case of CVVS 1.25mm2
Less than 450m in case of CVVS 2.0mm2

FunctionsPower supply

Alarm delay/suppression/zero follower

Power consumption
Cable connecting port

Maximum 8.7 W

Tube connecting port
Initial clear
Operating temperature
Operating humidity
Structure
Explosion-proof structure
Explosion-proof class

24 VDC±10%
Pressure proof packing gland<G3/4> (Compatible cables 9.0 - 16.0mm inouter diameter)
Rc1/8 (O.D8-1t half-union for Cu tube <Bs> supplied or half-union for SUS
tube <SUS>)
About 25 seconds-20 ~ +53ºC (Non-rapidly-vary)
Below 95% RH (Non-condensing)
Wall mounting type (2B<50A> pipe installation supported),
Flame-proof enclosures
Ⅱ 2G Ex db h ⅡB+H2 T4 Gb

Protection grade
Equivalent to IP67
Dimension
Approx. 197 (W) x 292 (H) x 140 (D) mm (projection portions excluded)
WeightApprox. 5.8 kg
Outer color
Munsell 7.5BG5/2* Specifications subject to changes without notice.

71

10 Product Specifications

10-1. List of specifications[SD-D58・DC(TYPE GP H)/ SD-D58・DC(TYPE NC H)]＜ATEX/UKEX Specifications＞
Model
Type
Detection principle
Detection gas
Display
Detection range
Resolution
Alarm setpoints
Detection method
Flow rate
Power display
External output
Alarm accuracy (under thesame conditions)
Response time (under thesame conditions)
Gas alarm typeGas alarm display
Gas alarm patternFault alarm/self diagnosis
Fault alarm display
Fault alarm pattern
Alarm contact
Contact capacity
Transmission system

SD-D58・DC
TYPE GP H
Catalytic combustion type

TYPE NC H
New ceramic typeCombustible gas
Seven-segment LED (four-digit)
0 - 100% LEL
Depend on detection gas
0.5% LEL
Depend on detection gas
25% LEL [standard setting value]
Depend on detection gas
Sample-drawing
1.0 L/min or more (at maximum suction pressure of 5.0 kPa <gauge pressure>)
POWER lamp on (green)
Gas concentration signal/alarm contact (gas alarm or fault alarm, gas/fault
common alarm)
Within ±25% to the alarm setpoint value
Within 30 seconds after providing the gas 1.6 times the alarm setpoint (excluding
delay in the tube)
One-step alarm (H)ALM lamp on (red)Non latching (Auto-reset)
System abnormalities/sensor abnormalities/low flow rates
FAULT lamp on (yellow)/detail display
Non latching (Auto-reset)
No-voltage contact 1a, de-energized (energized in response to an alarm) or
energized (de-energized in response to an alarm)
30 VDC - 0.5 A (resistant load)
Three-wire analog transmission(in common with power supply<power
supply,signal,common>)(HART communication)

Transmission specifications 4 - 20 mA DC (no-insulation/load resistance under 300 Ω)/
HART7( HART communication)
Power/contact/transmission Shielded cable of CVVS, etc. (1.25mm2 or 2.0mm2) - 3-core (when the contact is
cable
not used)
Shielded cable of CVVS, etc. (1.25mm2 or 2.0mm2) - 5-core (when the contact is
used)Transmission distanceLess than 250m in case of CVVS 1.25mm2
Less than 450m in case of CVVS 2.0mm2
FunctionsPower supply

Alarm delay/suppression/zero follower

Power consumption
Cable connecting port

Maximum 8.7 W

Tube connecting port
Initial clear
Operating temperature
Operating humidity
Structure
Explosion-proof structure

24 VDC±10%
Pressure proof packing gland<G3/4> (Compatible cables 9.0 - 16.0mm in outer
diameter)
Rc1/8 (O.D8-1t half-union for Cu tube <Bs> supplied or half-union for SUS tube
<SUS>)
About 25 seconds-20 ~ +53ºC (Non-rapidly-vary)
Below 95% RH (Non-condensing)
Wall mounting type (2B<50A> pipe installation supported)
Flame-proof enclosures72

10 Product Specifications
Explosion-proof class

10-1. List of specifications
Ⅱ 2G Ex db h ⅡB+H2 T4 Gb

Protection grade
Equivalent to IP67
Dimension
Approx. 197 (W) x 292(H) x 140 (D) mm (projection portions excluded)
WeightApprox. 5.8 kg
Outer color
Munsell 7.5BG5/2* Specifications subject to changes without notice.

73

10 Product Specifications

10-1. List of specifications[SD-D58・DC(TYPE NCW)]＜ATEX/UKEX Specifications＞
Model

SD-D58・DC

Type
Detection principle
Detection gas
Display
Detection range
Resolution
Alarm setpoints
Detection method
Flow rate

TYPE NCW
New ceramic typeCombustible gas
Seven-segment LED (four-digit)
Depend on detection gas
Depend on detection gas
Depend on detection gas
Sample-drawing
1.0 L/min or more (at maximum suction pressure of 5.0 kPa <gaugepressure>)
POWER lamp on (green)
Gas concentration signal/alarm contact (gas alarm or fault alarm, gas/fault
common alarm)
Within ±25% to the alarm setpoint value

Power display
External output
Alarm accuracy (under thesame conditions)
Response time (under thesame conditions)
Gas alarm typeGas alarm display
Gas alarm patternFault alarm/self diagnosis
Fault alarm display
Fault alarm pattern
Alarm contact

Within 30 seconds after providing the gas 1.6 times the alarm setpoint(excluding delay in the tube)
One-step alarm (H)ALM lamp on (red)Non latching (Auto-reset)
System abnormalities/sensor abnormalities/low flow rates
FAULT lamp on (yellow)/detail display
Non latching (Auto-reset)
No-voltage contact 1a, de-energized (energized in response to an alarm) or
energized (de-energized in response to an alarm)
Contact capacity
30 VDC - 0.5 A (resistant load)
Transmission system
Three-wire analog transmission(in common with power supply<power
supply,signal,common>)Transmission specifications 4 - 20mADC (no-insulation/load resistance under 300Ω)[Standard] 4-16mA (L range) / 16-20mA (H range)[Options] 4-20mA (L range) / 22mA (H range) or 4-20mA (H range)
Power/contact/transmission Shielded cable of CVVS, etc. (1.25mm2 or 2.0mm2) - 3-core (when the contact
cable
is not used)
Shielded cable of CVVS, etc. (1.25mm2 or 2.0mm2) - 5-core (when the contact
is used)Transmission distanceLess than 250m in case of CVVS 1.25mm2
Less than 450m in case of CVVS 2.0mm2
FunctionsPower supply

Alarm delay/suppression/zero follower

Power consumption
Cable connecting port

Maximum 8.7 W

Tube connecting port
Initial clear
Operating temperature
Operating humidity
Structure

24 VDC±10%
Pressure proof packing gland<G3/4> (Compatible cables 9.0 - 16.0mm inouter diameter)
Rc1/8 (O.D8-1t half-union for Cu tube <Bs> supplied or half-union for SUS
tube <SUS>)
About 25 seconds-20 ~ +53ºC (Non-rapidly-vary)
Below 95% RH (Non-condensing)
Wall mounting type (2B<50A> pipe installation supported),74

10 Product Specifications
Explosion-proof structure
Explosion-proof class

10-1. List of specifications
Flame-proof enclosures
Ⅱ 2G Ex db h ⅡB+H2 T4 Gb

Protection grade
Equivalent to IP67
Dimension
Approx. 197 (W) x 292 (H) x 140 (D) mm (projection portions excluded)
WeightApprox. 5.8 kg
Outer color
Munsell 7.5BG5/2* Specifications subject to changes without notice.

75

10 Product Specifications

10-1. List of specifications[SD-D58・AC(TYPE GP)/ SD-D58・AC(TYPE NC)]＜Taiwan Ex(TS) Specifications＞
Model
Type
Detection principle
Detection gas
Display
Detection range
Resolution
Alarm setpoints
Detection method
Flow rate
Power display
External output
Alarm accuracy (under
the same conditions)
Response time (under
the same conditions)
Gas alarm typeGas alarm display
Gas alarm patternFault alarm/self
diagnosis
Fault alarm display
Fault alarm pattern
Alarm contact
Contact capacity
Transmission system
Transmission
specifications
Transmission cable

SD-D58・AC
TYPE GP
Catalytic combustion type

TYPE NC
New ceramic typeCombustible gas
Seven-segment LED (four-digit)
0 - 100% LEL
Depend on detection gas
0.5% LEL
Depend on detection gas
25% LEL [standard setting value]
Depend on detection gas
Sample-drawing
1.5 L/min or more (at maximum suction pressure of 5.3 kPa <gauge pressure>)
POWER lamp on (green)
Gas concentration signal/alarm contact (gas alarm or fault alarm, gas/fault common
alarm)
Within ±25% to the alarm setpoint value
Within 30 seconds after providing the gas 1.6 times the alarm setpoint (excluding
delay in the tube)
One-step alarm (H)ALM lamp on (red)Non latching (Auto-reset)
System abnormalities/sensor abnormalities/low flow rates
FAULT lamp on (yellow)/detail display
Non latching (Auto-reset)
No-voltage contact 1a, de-energized (energized in response to an alarm) or
energized (de-energized in response to an alarm)
250 VAC - 0.5 A/30 VDC - 0.5 A (resistant load)
Analog transmission
4 - 20 mA DC (no-insulation/load resistance under 300 Ω)
Shielded cable of CVVS, etc. (1.25mm2 or 2.0mm2) - 2-core (when the contact is not
used)
Shielded cable of CVVS, etc. (1.25mm2 or 2.0mm2) - 4-core (when the contact is
used)Transmission distanceLess than 1.0km in case of CVVS 1.25mm2
Less than 2.0km in case of CVVS 2.0mm2

FunctionsPower cable
Power supply
Power consumption
Cable connecting port

Alarm delay/suppression/zero follower
CVV, etc. (1.25mm2 or 2.0mm2) - 2-core or 3-core
100 - 110 VAC, 50/60 Hz
Maximum 13 VA

Tube connecting port

Rc1/8 (O.D8-1t half-union for Cu tube <Bs> supplied or half-union for SUS tube
<SUS>)
About 25 seconds-20 ~ +50ºC (Non-rapidly-vary)
Below 95% RH (Non-condensing)
Wall mounting type (2B<50A> pipe installation supported)
Flame-proof enclosures

Initial clear
Operating temperature
Operating humidity
Structure
Explosion-proof

Pressure proof packing gland<G3/4> (Compatible cables 9.0 - 16.0mm in outer
diameter)76

10 Product Specifications
structure
Explosion-proof class

10-1. List of specifications

Ex d ⅡB+H2 T4 Gb

Protection grade
Equivalent to IP67
Dimension
Approx. 197 (W) x 292 (H) x 140 (D) mm (projection portions excluded)
WeightApprox. 5.8 kg
Outer color
Munsell 7.5BG5/2* Specifications subject to changes without notice.

77

10 Product Specifications

10-1. List of specifications[SD-D58・DC(TYPE GP)/ SD-D58・DC(TYPE NC)]＜Taiwan Ex(TS) Specifications＞
Model
SD-D58・DC
Type
Detection principle
Detection gas
Display
Detection range
Resolution
Alarm setpoints
Detection method
Flow rate
Power display
External output
Alarm accuracy (under thesame conditions)
Response time (under thesame conditions)
Gas alarm typeGas alarm display
Gas alarm patternFault alarm/self diagnosis
Fault alarm display
Fault alarm pattern
Alarm contact
Contact capacity
Transmission system

TYPE GPTYPE NC
Catalytic combustion typeNew ceramic typeCombustible gas
Seven-segment LED (four-digit)
0 - 100% LEL
Depend on detection gas
0.5% LEL
Depend on detection gas
25% LEL [standard setting value] Depend on detection gas
Sample-drawing
1.0 L/min or more (at maximum suction pressure of 5.0 kPa <gaugepressure>)
POWER lamp on (green)
Gas concentration signal/alarm contact (gas alarm or fault alarm, gas/fault
common alarm)
Within ±25% to the alarm setpoint value
Within 30 seconds after providing the gas 1.6 times the alarm setpoint(excluding delay in the tube)
One-step alarm (H)ALM lamp on (red)Non latching (Auto-reset)
System abnormalities/sensor abnormalities/low flow rates
FAULT lamp on (yellow)/detail display
Non latching (Auto-reset)
No-voltage contact 1a, de-energized (energized in response to an alarm)or energized (de-energized in response to an alarm)
250 VAC - 0.5 A/30 VDC - 0.5 A (resistant load)
Three-wire analog transmission(in common with power supply<power
supply,signal,common>)Transmission specifications 4 - 20 mA DC (no-insulation/load resistance under 300 Ω)Power/contact/transmission Shielded cable of CVVS, etc. (1.25mm2 or 2.0mm2) - 3-core (when thecablecontact is not used)
Shielded cable of CVVS, etc. (1.25mm2 or 2.0mm2) - 5-core (when thecontact is used)
Transmission distanceLess than 250m in case of CVVS 1.25mm2
Less than 450m in case of CVVS 2.0mm2
FunctionsPower supply

Alarm delay/suppression/zero follower

Power consumption
Cable connecting port

Maximum 8.7 W

Tube connecting port
Initial clear
Operating temperature
Operating humidity
Structure
Explosion-proof structure
Explosion-proof class

24 VDC±10%
Pressure proof packing gland<G3/4> (Compatible cables 9.0 - 16.0mm
in outer diameter)
Rc1/8 (O.D8-1t half-union for Cu tube <Bs> supplied or half-union for
SUS tube <SUS>)
About 25 seconds-20 ~ +53ºC (Non-rapidly-vary)
Below 95% RH (Non-condensing)
Wall mounting type (2B<50A> pipe installation supported)
Flame-proof enclosures
Ex d ⅡB+H2 T4 Gb
78

10 Product Specifications

10-1. List of specifications

Protection grade
Equivalent to IP67
Dimension
Approx. 197 (W) x 292 (H) x 140 (D) mm (projection portions excluded)
WeightApprox. 5.8 kg
Outer color
Munsell 7.5BG5/2* Specifications subject to changes without notice.

79

10 Product Specifications

10-1. List of specifications[SD-D58・AC(TYPE GP)/ SD-D58・AC(TYPE NC)]＜Japan Ex Specifications＞
Model
Type
Detection principle
Detection gas
Display
Detection range
Display resolution
Alarm setpoints
Detection method
Flow rate
Alarm setpoint value
Power display
External output
Alarm accuracy (under
the same conditions)
Response time (under
the same conditions)
Gas alarm typeGas alarm display
Gas alarm patternFault alarm/self
diagnosis
Fault alarm display
Fault alarm pattern
Alarm contact
Contact capacity
Transmission system
Transmission
specifications
Transmission cable

SD-D58・AC
TYPE GP
Catalytic combustion type

TYPE NC
New ceramic typeCombustible gas
Seven-segment LED (four-digit)
0 - 100% LEL
Depend on detection gas
0.5% LEL
Depend on detection gas
25% LEL [standard setting value]
Depend on detection gas
Sample-drawing
1.5 L/min or more (at maximum suction pressure of 5.3 kPa <gauge pressure>)
25% LEL [standard setting value]
POWER lamp on (green)
Gas concentration signal/alarm contact (gas alarm or fault alarm, gas/fault common
alarm)
Within ±25% to the alarm setpoint value
Within 30 seconds after providing the gas 1.6 times the alarm setpoint (excluding
delay in the tube)
One-step alarm (H)ALM lamp on (red)Non latching (Auto-reset)
System abnormalities/sensor abnormalities/low flow rates
FAULT lamp on (yellow)/detail display
Non latching (Auto-reset)
No-voltage contact 1a, de-energized (energized in response to an alarm) or
energized (de-energized in response to an alarm)
250 VAC - 0.5 A/30 VDC - 0.5 A (resistant load)
Analog transmission
4 - 20 mA DC (no-insulation/load resistance under 300 Ω)
Shielded cable of CVVS, etc. (1.25mm2 or 2.0mm2) - 2-core (when the contact is not
used)
Shielded cable of CVVS, etc. (1.25mm2 or 2.0mm2) - 4-core (when the contact is
used)Transmission distanceLess than 1.0km in case of CVVS 1.25mm2
Less than 2.0km in case of CVVS 2.0mm2

FunctionsPower cable
Power supply
Power consumption
Cable connecting port

Alarm delay/suppression/zero follower
CVV, etc. (1.25mm2 or 2.0mm2) - 2-core or 3-core
100 - 110 VAC, 50/60 Hz
Maximum 13 VA

Tube connecting port

Rc1/8 (O.D8-1t half-union for Cu tube <Bs> supplied or half-union for SUS tube
<SUS>)
About 25 seconds-20 ~ +50ºC (Non-rapidly-vary)
Below 95% RH (Non-condensing)
Wall mounting type (2B<50A> pipe installation supported)

Initial clear
Operating temperature
Operating humidity
Structure

Pressure proof packing gland<G3/4> (Compatible cables 9.0mm - in outer
diameter)80

10 Product Specifications
Explosion-proof
structure
Explosion-proof class

10-1. List of specifications
Flame-proof enclosures
Ex d ⅡB+H2 T4Protection grade
Equivalent to IP67
Dimension
Approx. 197 (W) x 292 (H) x 140 (D) mm (projection portions excluded)
WeightApprox. 5.8 kg
Outer color
Munsell 7.5BG5/2* Specifications subject to changes without notice.

81

10 Product Specifications

10-1. List of specifications[SD-D58・AC(TYPE GP H)/ SD-D58・AC(TYPE NC H)]＜Japan Ex Specifications＞
Model
Type
Detection principle
Detection gas
Display
Detection range
Display resolution
Alarm setpoints
Detection method
Flow rate
Power display
External output
Alarm accuracy (under
the same conditions)
Response time (under
the same conditions)
Gas alarm typeGas alarm display
Gas alarm patternFault alarm/self
diagnosis
Fault alarm display
Fault alarm pattern
Alarm contact
Contact capacity
Transmission system
Transmission
specifications

SD-D58・AC
TYPE GP H
TYPE NC H
Catalytic combustion typeNew ceramic typeCombustible gas
Seven-segment LED (four-digit)
0 - 100% LEL
Depend on detection gas
0.5% LEL
Depend on detection gas
25% LEL [standard setting value]
Depend on detection gas
Sample-drawing
1.5 L/min or more (at maximum suction pressure of 5.3 kPa <gaugepressure>)
POWER lamp on (green)
Gas concentration signal/alarm contact (gas alarm or fault alarm, gas/fault
common alarm)
Within ±25% to the alarm setpoint value
Within 30 seconds after providing the gas 1.6 times the alarm setpoint(excluding delay in the tube)
One-step alarm (H)ALM lamp on (red)Non latching (Auto-reset)
System abnormalities/sensor abnormalities/low flow rates
FAULT lamp on (yellow)/detail display
Non latching (Auto-reset)
No-voltage contact 1a, de-energized (energized in response to an alarm) or
energized (de-energized in response to an alarm)
250 VAC - 0.5 A/30 VDC - 0.5 A (resistant load)
Analog transmission(HART communication)
4 - 20 mA DC (no-insulation/load resistance under 300 Ω)/
HART7(HART communication) .

Transmission cable

Shielded cable of CVVS, etc. (1.25mm2 or 2.0mm2) - 2-core (when the contact
is not used)
Shielded cable of CVVS, etc. (1.25mm2 or 2.0mm2) - 4-core (when the contact
is used)Transmission distanceLess than 1.25km in case of CVVS 1.25mm2
Less than 2.0km in case of CVVS 2.0mm2

FunctionsPower cable
Power supply
Power consumption
Cable connecting port

Alarm delay/suppression/zero follower
CVV, etc. (1.25mm2 or 2.0mm2) - 2-core or 3-core
100 - 110 VAC, 50/60 Hz
Maximum 13 VA

Tube connecting port

Rc1/8 (O.D8-1t half-union for Cu tube <Bs> supplied or half-union for SUS
tube <SUS>)
About 25 seconds-20 ~ +50ºC (Non-rapidly-vary)
Below 95% RH (Non-condensing)
Wall mounting type (2B<50A> pipe installation supported)

Initial clear
Operating temperature
Operating humidity
Structure

Pressure proof packing gland<G3/4> (Compatible cables 9.0mm - in outer
diameter)82

10 Product Specifications
Explosion-proof
structure
Explosion-proof class

10-1. List of specifications
Flame-proof enclosures
Ex d ⅡB+H2 T4Protection grade
Equivalent to IP67
Dimension
Approx. 197 (W) x 292 (H) x 140 (D) mm (projection portions excluded)
WeightApprox. 5.8 kg
Outer color
Munsell 7.5BG5/2* Specifications subject to changes without notice.

83

10 Product Specifications

10-1. List of specifications[SD-D58ꞏAC (TYPE NCW)]＜Japan Ex Specifications＞
Model
Type
Detection principle
Detection gas
Display
Detection range
Resolution
Detection method
Flow rate
Alarm setpoints
Power display
External output
Alarm accuracy(under the same
conditions)
Response time (under
the same conditions)
Gas alarm typeGas alarm display
Gas alarm patternFault alarm/self
diagnosis
Fault alarm display
Fault alarm pattern
Alarm contact
Contact capacity
Transmission system
Transmission
specifications
Transmission cable

Transmission
distance
FunctionsPower cable
Power supply
Power consumption
Cable connecting port

SD-D58ꞏAC
TYPE NCW
New ceramic typeCombustible gas
Seven-segment LED (four-digit)
Depend on detection gas
Depend on detection gas
Sample-drawing
1.5 L/min or more (at maximum suction pressure of 5.3 kPa <gauge pressure>)
Depend on detection gas
POWER lamp on (green)
Gas concentration signal/alarm contact (gas alarm or fault alarm, gas/fault
common alarm)
Within ±25% to the alarm setpoint value

Within 30 seconds after providing the gas 1.6 times the alarm setpoint(excluding delay in the tube)
One-step alarm (H)ALM lamp on (red)Non latching (Auto-reset)
System abnormalities/sensor abnormalities/low flow rates
FAULT lamp on (yellow)/detail display
Non latching (Auto-reset)
No-voltage contact 1a, de-energized (energized in response to an alarm) or
energized (de-energized in response to an alarm)
250 VAC - 0.5 A/30 VDC - 0.5 A (resistant load)
Analog transmission
4 - 20mADC (no-insulation/load resistance under 300Ω)[Standard] 4-16mA (L range) / 16-20mA (H range)[Options] 4-20mA (L range) / 22mA (H range) or 4-20mA (H range)
Shielded cable of CVVS, etc. (1.25mm2 or 2.0mm2) - 2-core (when the contact
is not used)
Shielded cable of CVVS, etc. (1.25mm2 or 2.0mm2) - 4-core (when the contact
is used)Less than 1.0km in case of CVVS 1.25mm2
Less than 2.0km in case of CVVS 2.0mm2
Alarm delay/suppression/zero follower
CVV, etc. (1.25mm2 or 2.0mm2) - 2-core or 3-core
100 -110 VAC, 50/60 Hz
Maximum 13 VA
Pressure proof packing gland<G3/4> (Compatible cables 9.0mm - in outer
diameter)Tube connecting port

Rc1/8 (O.D8-1t half-union for Cu tube <Bs> supplied or half-union for SUS
tube <SUS>)
Initial clear
About 25 seconds
Operating temperature -20 ~ +50ºC (Non-rapidly-vary)
Operating humidity
Below 95% RH (Non-condensing)
Structure
Wall mounting type (2B<50A> pipe installation supported)84

10 Product Specifications
Explosion-proof
structure
Explosion-proof class

10-1. List of specifications
Flame-proof enclosures
Ex d ⅡB+H2 T4Protection grade
Equivalent to IP67
Dimension
Approx. 197 (W) x 292 (H) x 140 (D) mm (projection portions excluded)
WeightApprox. 5.8 kg
Outer color
Munsell 7.5BG5/2* Specifications subject to changes without notice.

85

10 Product Specifications

10-1. List of specifications[SD-D58・DC(TYPE GP)/ SD-D58・DC(TYPE NC)]＜Japan Ex Specifications＞
Model
Type
Detection principle
Detection gas
Display
Detection range
Resolution
Alarm setpoints
Detection method
Flow rate
Power display
External output
Alarm accuracy (under thesame conditions)
Response time (under thesame conditions)
Gas alarm typeGas alarm display
Gas alarm patternFault alarm/self diagnosis
Fault alarm display
Fault alarm pattern
Alarm contact
Contact capacity
Transmission system

SD-D58・DC
TYPE GPTYPE NC
Catalytic combustion typeNew ceramic typeCombustible gas
Seven-segment LED (four-digit)
0 - 100% LEL
Depend on detection gas
0.5% LEL
Depend on detection gas
25% LEL [standard setting value] Depend on detection gas
Sample-drawing
1.0 L/min or more (at maximum suction pressure of 5.0 kPa <gaugepressure>)
POWER lamp on (green)
Gas concentration signal/alarm contact (gas alarm or fault alarm, gas/fault
common alarm)
Within ±25% to the alarm setpoint value
Within 30 seconds after providing the gas 1.6 times the alarm setpoint(excluding delay in the tube)
One-step alarm (H)ALM lamp on (red)Non latching (Auto-reset)
System abnormalities/sensor abnormalities/low flow rates
FAULT lamp on (yellow)/detail display
Non latching (Auto-reset)
No-voltage contact 1a, de-energized (energized in response to an alarm)or energized (de-energized in response to an alarm)
250 VAC - 0.5 A/30 VDC - 0.5 A (resistant load)
Three-wire analog transmission(in common with power supply<power
supply,signal,common>)Transmission specifications 4 - 20 mA DC (no-insulation/load resistance under 300 Ω)Power/contact/transmission Shielded cable of CVVS, etc. (1.25mm2 or 2.0mm2) - 3-core (when thecablecontact is not used)
Shielded cable of CVVS, etc. (1.25mm2 or 2.0mm2) - 5-core (when thecontact is used)
Transmission distanceLess than 250m in case of CVVS 1.25mm2
Less than 450m in case of CVVS 2.0mm2
FunctionsPower supply

Alarm delay/suppression/zero follower

Power consumption
Cable connecting port

Maximum 8.7 W

Tube connecting port
Initial clear
Operating temperature
Operating humidity
Structure
Explosion-proof structure

24 VDC±10%
Pressure proof packing gland<G3/4> (Compatible cables 9.0mm - inouter diameter)
Rc1/8 (O.D8-1t half-union for Cu tube <Bs> supplied or half-union for
SUS tube <SUS>)
About 25 seconds-20 ~ +53ºC (Non-rapidly-vary)
Below 95% RH (Non-condensing)
Wall mounting type (2B<50A> pipe installation supported)
Flame-proof enclosures86

10 Product Specifications
Explosion-proof class

10-1. List of specifications
Ex d ⅡB+H2 T4Protection grade
Equivalent to IP67
Dimension
Approx. 197 (W) x 292 (H) x 140 (D) mm (projection portions excluded)
WeightApprox. 5.8 kg
Outer color
Munsell 7.5BG5/2* Specifications subject to changes without notice.

87

10 Product Specifications

10-1. List of specifications[SD-D58・DC(TYPE GP H)/ SD-D58・DC(TYPE NC H)]＜Japan Ex Specifications＞
Model
Type
Detection principle
Detection gas
Display
Detection range
Resolution
Alarm setpoints
Detection method
Flow rate
Power display
External output
Alarm accuracy (under thesame conditions)
Response time (under thesame conditions)
Gas alarm typeGas alarm display
Gas alarm patternFault alarm/self diagnosis
Fault alarm display
Fault alarm pattern
Alarm contact
Contact capacity
Transmission system

SD-D58・DC
TYPE GP H
TYPE NC H
Catalytic combustion typeNew ceramic typeCombustible gas
Seven-segment LED (four-digit)
0 - 100% LEL
Depend on detection gas
0.5% LEL
Depend on detection gas
25% LEL [standard setting value] Depend on detection gas
Sample-drawing
1.0 L/min or more (at maximum suction pressure of 5.0 kPa <gaugepressure>)
POWER lamp on (green)
Gas concentration signal/alarm contact (gas alarm or fault alarm, gas/fault
common alarm)
Within ±25% to the alarm setpoint value
Within 30 seconds after providing the gas 1.6 times the alarm setpoint(excluding delay in the tube)
One-step alarm (H)ALM lamp on (red)Non latching (Auto-reset)
System abnormalities/sensor abnormalities/low flow rates
FAULT lamp on (yellow)/detail display
Non latching (Auto-reset)
No-voltage contact 1a, de-energized (energized in response to an alarm)or energized (de-energized in response to an alarm)
250 VAC - 0.5 A/30 VDC - 0.5 A (resistant load)
Three-wire analog transmission(in common with power supply<power
supply,signal,common>)(HART communication)

Transmission specifications 4 - 20 mA DC (no-insulation/load resistance under 300 Ω)/
HART7(HART communication)
Power/contact/transmission Shielded cable of CVVS, etc. (1.25mm2 or 2.0mm2) - 3-core (when thecablecontact is not used)
Shielded cable of CVVS, etc. (1.25mm2 or 2.0mm2) - 5-core (when thecontact is used)
Transmission distanceLess than 250m in case of CVVS 1.25mm2
Less than 450m in case of CVVS 2.0mm2
FunctionsPower supply
Power consumption
Cable connecting port
Tube connecting port
Initial clear
Operating temperature
Operating humidity
Structure
Explosion-proof structure

Alarm delay/suppression/zero follower
24 VDC±10%
Maximum 8.7 W
Pressure proof packing gland<G3/4> (Compatible cables 9.0mm - inouter diameter)
Rc1/8 (O.D8-1t half-union for Cu tube <Bs> supplied or half-union for
SUS tube <SUS>)
About 25 seconds-20 ~ +53ºC (Non-rapidly-vary)
Below 95% RH (Non-condensing)
Wall mounting type (2B<50A> pipe installation supported)
Flame-proof enclosures88

10 Product Specifications
Explosion-proof class

10-1. List of specifications
Ex d ⅡB+H2 T4Protection grade
Equivalent to IP67
Dimension
Approx. 197 (W) x 292 (H) x 140 (D) mm (projection portions excluded)
WeightApprox. 5.8 kg
Outer color
Munsell 7.5BG5/2* Specifications subject to changes without notice.

89

10 Product Specifications

10-1. List of specifications[SD-D58ꞏDC (TYPE NCW)]＜Japan Ex Specifications＞
Model
Type
Detection principle
Detection gas
Display
Detection range
Resolution
Detection method
Flow rate
Alarm setpoints
Power display
External output
Alarm accuracy (under thesame conditions)
Response time (under thesame conditions)
Gas alarm typeGas alarm display
Gas alarm patternFault alarm/self diagnosis
Fault alarm display
Fault alarm pattern
Alarm contact

SD-D58ꞏDC
TYPE NCW
New ceramic typeCombustible gas
Seven-segment LED (four-digit)
Depend on detection gas
Depend on detection gas
Sample-drawing
1.0 L/min or more (at maximum suction pressure of 5.0 kPa <gaugepressure>)
Depend on detection gas
POWER lamp on (green)
Gas concentration signal/alarm contact (gas alarm or fault alarm, gas/fault
common alarm)
Within ±25% to the alarm setpoint value

Within 30 seconds after providing the gas 1.6 times the alarm setpoint(excluding delay in the tube)
One-step alarm (H)ALM lamp on (red)Non latching (Auto-reset)
System abnormalities/sensor abnormalities/low flow rates
FAULT lamp on (yellow)/detail display
Non latching (Auto-reset)
No-voltage contact 1a, de-energized (energized in response to an alarm)or energized (de-energized in response to an alarm)
Contact capacity
250 VAC - 0.5 A/30 VDC - 0.5 A (resistant load)
Transmission system
Three-wire analog transmission(in common with power supply<power
supply,signal,common>)Transmission specifications 4 - 20mADC (no-insulation/load resistance under 300Ω)[Standard] 4-16mA (L range) / 16-20mA (H range)[Options] 4-20mA (L range) / 22mA (H range) or 4-20mA (H range)
Power/contact/transmission Shielded cable of CVVS, etc. (1.25mm2 or 2.0mm2) - 3-core (when thecablecontact is not used)
Shielded cable of CVVS, etc. (1.25mm2 or 2.0mm2) - 5-core (when thecontact is used)
Transmission distanceLess than 250m in case of CVVS 1.25mm2
Less than 450m in case of CVVS 2.0mm2
Functions
Alarm delay/suppression/zero follower
Power supply
24 VDC±10%Power consumption
Cable connecting port

Maximum 8.7W

Tube connecting port

Rc1/8 (O.D8-1t half-union for Cu tube <Bs> supplied or half-union for
SUS tube <SUS>)
About 25 seconds-20 ~ +53ºC (Non-rapidly-vary)
Below 95% RH (Non-condensing)
Wall mounting type (2B<50A> pipe installation supported)
Flame-proof enclosures

Initial clear
Operating temperature
Operating humidity
Structure
Explosion-proof structure

Pressure proof packing gland<G3/4> (Compatible cables 9.0mm - inouter diameter)90

10 Product Specifications
Explosion-proof class

10-1. List of specifications
Ex d ⅡB+H2 T4Protection grade
Equialent to IP67
Dimension
Approx. 197 (W) x 292 (H) x 140 (D) mm (projection portions excluded)
WeightApprox. 5.8 kg
Outer color
Munsell 7.5BG5/2* Specifications subject to changes without notice.

91

10 Product Specifications

10-2. Detection principle

10-2. Detection principle[Catalytic Combustion Type]
When a combustible gas burns on the surface of a oxidation catalyst, the catalytic combustion type sensor
considers resultant combustion heat as temperature and resistance changes in the platinum wire coil, andmeasures their gas concentrations.
This sensor detects any combustible gases. The detection range is from zero to the lower explosive limit.
When a high-concentrated gas over the lower explosive limit comes into contact with the sensor, it may be
a break.
C: Compensating
element

D: Detecting element
Alumina
Oxidation catalyst

Platinum wire coil

0.5 - 0.7 mm
FixedresistanceFixedresistance
0.8 - 1.0 mm

Variable resistor for bridge
equilibrium adjustment
SW
E

Structure Diagram

VR
SwitchVariable resistor for bridge
voltage adjustment

Power supply

Basic Circuit[New Ceramic Type]
When a combustible gas burns on the surface of a highly active new ceramic oxidation catalyst in catalytic
combustion, the new ceramic-type sensor measures resultant temperature changes by measuring theresistance changes in the heat-resistant alloy wire coil.
The sensor consists of two elements: A detecting element having a heat-resistant alloy wire coil with anultrafine particle (new ceramic) oxidation catalyst sintered on it together with a carrier and a temperaturecompensating element with a mixture of gas-inert alumina and glass sintered on it.
When a combustible gas comes into contact with the surface of the detecting element with new ceramicoxidation catalyst sintered on it, the gas burns, causing the temperature to rise. In accordance with thistemperature change, there occurs a change in the resistance of a heat-resistant alloy wire coil that
constitutes the element. These resistance values are approximately proportional to gas concentrations.
From the changes in the resistance values, potential differences are obtained using a bridge circuit anddisplayed as gas concentrations on the meter.
C: Compensating
element

D: Detecting element
AluminaHeat-resistant alloy wire coilHeat-resistant material(ceramic)

New ceramicoxidation catalyst
Fixedresistance

1.4 - 1.6 mm

1.3 - 1.8 mm

Structure Diagram

VR

Fixed
resistance

Variable resistor for bridge
equilibrium adjustment
SW
E

SwitchVariable resistor for bridge
voltage adjustment

Power supply

Basic Circuit92

10 Product Specifications

10-2. Detection principle[Flow Sensor]
The flow sensor has a circuit that can output a contact signal when the flow rate drops below the preset
level.
The flow sensor is a hot-wire type with a Wheatstone bridge consisting of a detecting element,compensating element, and fixed resistance. Contained in a flame arrester container allows it to be flameproof.
When the drawn air or gas comes into contact with the heated detecting element, the detecting element
temperature changes due to the heat dissipation, and the electrical resistance of the element changes
according to the temperature changes. Since the resistance changes are in proportion to the gas flow
rates, the Wheatstone bridge circuit can identify the changes as the flow rate.

C: Compensating
element

D: Detec ing element

Fixed
resistance

VR

Fixed
resistance

Variable resistor for bridge
equilibrium adjustment
SW
E

Variable resistor for bridge
voltage adjustment

SwitchPower supply

Basic Circuit

Flow Sensor Appearance93

11 Definition of Terms

11

Definition of Terms
Catalytic
combustion typeThis is a principle of the sensor installed in the TYPE GP, TYPE GP H.
See "10-2. Detection principle" for details.

New ceramicThis is a principle of the sensor installed in the TYPE NC, TYPE NCW, TYPE NC H.
See "10-2. Detection principle" for details.

Initial clear

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.

Full scale%LEL
ppm
Calibration
Zero suppression
Alarm delay time
INHIBIT
HART
communication

Maximum value of the detection range.
A unit which the lower explosive limit (LEL) of the combustible gas to be detected is
set to 100.
A concentration unit that means part per million of the combustible gas to be
detected.
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 head.
This is also called "point skip", which has the same function.
DC4-20mA signal digitals signalling is superimposed, and is methods thattransmit multiple signals.

94