PT2E-2770

Smart Transmitter/Gas Detector Head

SD-D58・AC・NP
SD-D58・DC・NP
SD-D58・AC-Z・NP
SD-D58・DC-Z・NP
SD-D58・AC・NP（TYPE H）
SD-D58・DC・NP（TYPE H）
SD-D58・AC-Z・NP（TYPE H）
SD-D58・DC-Z・NP（TYPE H）
Operating Manual

Operating Precautions
This detector 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 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 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 must be used for an external alarm lamp/buzzer, while thealarm 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 detection sensor installed in this detector 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 thegas sensing part becomes smaller, which may results in serious deterioration of its sensitivity.
For safety reasons, do not use the detector under the presence of silicon or sulfide compounds eventhough their amount is very small.

5.

For maintenance of the detector, it must go through a regular maintenance, including replacement andadjustment of the regular replacement parts as specified in the operating manual. 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
Safty information ..................................................................................................... 6

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

Product Components ............................................................................................... 7
Main unit and standard accessories ........................................................................ 7
Names and functions for each part .......................................................................... 9
Block diagram .......................................................................................................... 14

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

How to Use .............................................................................................................. 16
Before using the detector head ............................................................................... 16
Precautions for installation points ............................................................................ 16
Precautions for system designing ............................................................................ 17
How to install ........................................................................................................... 20
How to wire.............................................................................................................. 22
How to tube ............................................................................................................. 32

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

How to Operate ....................................................................................................... 33
Preparation for start-up............................................................................................ 33
Basic operating procedures ..................................................................................... 34
How to start the detector head ................................................................................ 35
Modes...................................................................................................................... 36
Maintenance mode (User) ....................................................................................... 37
How to exit............................................................................................................... 39

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

Operations and Functions ....................................................................................... 40
Gas alarm activation ................................................................................................ 40
Fault alarm activation .............................................................................................. 41
Low Flow Rate Abnormal Operations ...................................................................... 41
External output operation ........................................................................................ 42
Other functions ........................................................................................................ 43

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

Maintenance ............................................................................................................ 44
Maintenance intervals and items ............................................................................. 44
Maintenance mode (Regular maintenance)............................................................. 46
Gas calibration method............................................................................................ 54
How to maintain flow sensor.................................................................................... 60
Parts replacement ................................................................................................... 61

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

Storage, Relocation and Disposal ........................................................................... 62
Procedures to store the detector head or leave it for a long time ............................ 62
Procedures to relocate the detector head or use it again ........................................ 62
Disposal of products ................................................................................................ 62

9.

Troubleshooting ....................................................................................................... 63

10.
10-1.
10-2.

Product Specifications ............................................................................................. 65
List of specifications ................................................................................................ 65
Detection principle ................................................................................................... 72

11.

Definition of Terms ................................................................................................... 74
SD-D58 Series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 four types of SD-D58･AC･NP/ SD-D58･AC-Z･NP/ SD-D58･DC･NP/SD-D58･DC-Z･
NP and HART communication SD-D58･AC･NP(TYPE H)/ SD-D58･AC-Z･NP(TYPE H)/ SD-D58･DC･
NP(TYPE H)/ SD-D58･DC-Z･NP(TYPE H).

1-2. Purpose of use
 The detector head is a fixed type detector head that detects leak of combustible/toxic 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 - 110 VAC
SD-D58·AC·NP/SD-D58･AC-Z･NP
DC power specification 24 VDC
SD-D58·DC·NP/SD-D58･DC-Z･NP


TYPE H has HART communication function.

1

SD-D58 Series1 Outline of the Product1-3. Definition of DANGER, WARNING, CAUTION, and NOTE

1-3. Definition of DANGER, WARNING, CAUTION, andNOTE
DANGER

This message indicates that improper handling may cause death or serious
damage on 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.

SD-D58 Series23 Product Components

3-2. Names and functions for each part

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

Terminal plate(for power input supply)
Terminal plate(for transmission)
Power switch

Power input terminal plate.
(AC specifications: 3-pole, DC specifications: 2-pole)
Terminal plate for transmission.

(4)

Grounding terminal

Terminal for grounding.(M4×6)

(5)

Fuse

Main power fuse. (Only SD-D58･AC･NP/ SD-D58･AC-Z･NP.)

(1)
(2)
(3)

SD-D58 Series

Power switch of the detector head. (Only SD-D58･AC･NP/
SD-D58･AC-Z･NP.)

10

3 Product Components

3-2. Names and functions for each part

<Inside of the main unit> (Drive section)(3) Pump(2) Flow sensor(1) Gas sensor

(1)
(2)
(3)

Gas sensor
Flow sensor
Pump

Gas detection sensor.
Sensor for detection of low flow rate.
Sample draw pump.

NOTE
Open the drive lid and the hexagon socket head boltson the four corners.
Remove the drive lid to find the drive section shown in
the figure above.
The bolt with the hexagon socket must use thestainless steel material of property class "A2-70".

Drive lid

 Grease specified by RIKEN KEIKI : BARRIERTA JFE 552(manufactured by NOK KLUBER)
If you can not prepare the specified grease, use one thatmeets the following requirements.
1. Material does not harden due to deterioration
2. Volatile solvent-free
3. Material does not cause corrosion at the surface
4. Silicon-free
5. Validation of suitability depends on the specifications of grease manufacturer

13

SD-D58 Series4 How to Use

4-4. How to install

4-4. How to install<Installation Dimensions and Maintenance Space>

Lid turning jig

Unit: mm
The following installation requirements must be met to install the detector head.
 Attach the detector head on the wall and others using four M6 screws.
 Tighten the hexagon socket head cap bolt fixing the lid and the main body with a tightening torque of 215.6±24.5N･cm.
 When closing the lid of the detector, make sure that there is no dust on screw, surfaces of the main bodyand lid. Then apply grease as specified by RIKEN KEIKI.

SD-D58 Series20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.

33

SD-D58 Series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.

<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)

SD-D58 Series40

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

Alarm delay time (15 seconds)

41

FAULT lamp lights up
Fault alarm contact outputs (*1)
*1: Depending on thespecifications for the alarm
contact
SD-D58 Series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.
Continuing to use the detector head without performing a maintenance will compromise the sensitivity of
the gas sensor, thus resulting in inaccurate detection.

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.

SD-D58 Series

44

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.

45

SD-D58 Series7 Maintenance7-2. Maintenance mode (Regular maintenance)

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

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

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

 Regular maintenance mode
2-0. Test mode
Performs various tests.

Test mode
 P49

2-1. Zero adjustment
Performs the zeroadjustment.

Zero adjustment
 P55

2-2. Span adjustment
Performs the span
adjustment.

Span adjustment
 P56

2-3. Zero/span initialization
Initializes the zero/span
adjustment after the sensor is
replaced.
Environment setting P53

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 usedby the user.

47

SD-D58 Series

7 Maintenance7-2. Maintenance mode (Regular maintenance)

Flow sensor setting
 P57

2-6. Flow sensor setting
Sets the flow sensor
functions.

"2-6.0," "2-6.5" to "2-6.6," and"2-6.8" to "2-6.9" are factoryset. They are not typically usedby the user.

2-7. Flow sensor setting
display
Displays settings of theflow sensor. This is not
used by the user.
2-8.
Enters the factory mode.
This is not used by theuser.

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

2-9.
Returns to the user mode.

To 2-0. Test mode

SD-D58 Series48

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

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

When CAL. is displayed, thememory diagnosis is performed.

When memory is correct as a resultof the diagnosis, PASS isdisplayed. Press the SET key to go
back to the original state.
To 2-0.4

NOTE
When abnormalities are found in memory as a result of the diagnosis, PASS is not displayed. F-RA isdisplayed for the RAM fault, and F-RO is displayed for the ROM fault. For both the RAM fault and ROM
fault, F-RA and F-RO are displayed alternately.

SD-D58 Series52

7 Maintenance7-2. Maintenance mode (Regular maintenance)<Environmental Setting "2-4">
Set various operations and functions in the environmental setting.
<<Environmental Setting 1>>
2-4. Environmental setting
Press the SET key.

2-4.0
They are factory-set and not
typically used by the user.

2-4.1 INHIBIT setting
Set Inhibit.
Select either ON/OFF, andthen press the SET key toconfirm the selection.
When ON is selected, in thedetection mode InHI. and 0.0(gas concentration value) aredisplayed on the LED
alternately. As a result, an
alarm is not triggered toexternal device.
Alarm setpoint setting
 P53

2-4.2 Alarm setpoint setting
Set the alarm setpoint.

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

To 2-4.0<Alarm Setpoint Setting "2-4.2">
2-4.2
Press the SET key.

Alarm setpoint setting
Change the value by pressing
the  or  key, and thenpress the SET key to confirm
the value. (Press the
MENU/ESC key to go back to
the original state.)

Return to 2-4.2.

NOTE
A value exceeding 60% LEL of detection range cannot be set.
53

SD-D58 Series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.

Flow sensor zero point check completed
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.

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.

Flow sensor output check completed
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 is displayed.

SD-D58 Series

Return to 2-6.4.

60

7 Maintenance7-5. Parts replacement

7-5. Parts replacement<Gas Sensor and Flow Sensor Replacement>
Our service engineers need to replace and calibrate the sensor.
Please contact RIKEN KEIKI.

NOTE
The gas calibration using the standard gas is required after the sensor is replaced. The zero adjustment
is required after the flow sensor is replaced.
Please make a request to RIKEN KEIKI.

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

Replacement
intervals (year)

Quantity(pieces/unit)

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

Name
AC/DC converter(Only AC specifications)※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.

61

SD-D58 Series

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

―

―



Low flow rateabnormality
E-5

Systemabnormalities
E-9

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

63

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

SD-D58 Series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

SD-D58 Series

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.

64

10 Product Specifications

10-1. List of specifications

10

Product Specifications
10-1. List of specifications[SD-D58・AC・NP] ＜Bar terminal, TIIS Specifications＞
Model

SD-D58・AC・NP

Detection principle

Thermal conductivy type

Detection gas

Combustible gas in the air or inert gas

Display

Seven-segment LED (four-digit)

Detection range

Depend on detection gas

Resolution

Depend on detection gas

Detection method

Sample-drawing

Flow rate

1.5 L/min or more (at maximum suction pressure of 5.3 kPa <gauge pressure>)

Alarm setpoints

Depend on detection gas

Power display

POWER lamp on (green)

External output

Gas concentration signal/alarm contact (gas alarm or fault alarm, gas/fault common
alarm)

Alarm accuracy (under thesame conditions)

Within ±25% to the alarm setpoint value

Response time (under thesame conditions)

Within 30 seconds after providing the gas 1.6 times the alarm setpoint (excluding
delay in the tube)

Gas alarm typeOne-step alarm (H)Gas alarm display

ALM lamp on (red)Gas alarm pattern

Non latching (Auto-reset)

Fault alarm/self diagnosis

System abnormalities/sensor abnormalities/low flow rates(Option)

Fault alarm display

FAULT lamp on (yellow)/detail display

Fault alarm pattern

Non latching (Auto-reset)

Alarm contact

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

Analog transmission

Transmission specifications

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)
Less than 1.0km in case of CVV 1.25mm2
Less than 2.0km in case of CVV 2.0mm2

Transmission cable

Transmission distance
Functions

Alarm delay/suppression/zero follwer

Power cable

CVV, etc. (1.25mm2 or 2.0mm2) - 2-core or 3-core

Power supply

100 - 110 VAC ±10%, 50/60 Hz

Power consumption

Maximum 13 VA

Cable connecting port

Pressure proof packing gland<G3/4>(Compatible cables φ9.0mm～φ16.0mm)

Tube connecting port

Rc1/8 (O.D8-1t half-union for Cu tube <Bs> supplied or half-union for SUS tube
<SUS>)
65

SD-D58 Series

10 Product Specifications

10-1. List of specifications

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)

Explosion-proof structure

Flame-proof enclosures

Explosion-proof class

Ex d ⅡB+H2 T4 Gb

IP rating

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.

SD-D58 Series

66

10 Product Specifications

10-1. List of specifications[SD-D58・AC・NP(TYPE H)] ＜Bar terminal, TIIS Specifications＞
Model

SD-D58・AC・NP

Type

TYPE H

Detection principle

Thermal conductivy type

Detection gas

Combustible gas in the air or inert gas

Display

Seven-segment LED (four-digit)

Detection range

Depend on detection gas

Resolution

Depend on detection gas

Detection method

Sample-drawing

Flow rate

1.5 L/min or more (at maximum suction pressure of 5.3 kPa <gauge pressure>)

Alarm setpoints

Depend on detection gas

Power display

POWER lamp on (green)

External output

Gas concentration signal/alarm contact (gas alarm or fault alarm, gas/fault common
alarm)

Alarm accuracy (under thesame conditions)

Within ±25% to the alarm setpoint value

Response time (under thesame conditions)

Within 30 seconds after providing the gas 1.6 times the alarm setpoint (excluding
delay in the tube)

Gas alarm typeOne-step alarm (H)Gas alarm display

ALM lamp on (red)Gas alarm pattern

Non latching (Auto-reset)

Fault alarm/self diagnosis

System abnormalities/sensor abnormalities/low flow rates(Option)

Fault alarm display

FAULT lamp on (yellow)/detail display

Fault alarm pattern

Non latching (Auto-reset)

Alarm contact

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

Analog transmission(HART communication)

Transmission specifications

4 - 20mADC (no-insulation/load resistance under 300Ω)/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 1.0km in case of CVV 1.25mm2
Less than 2.0km in case of CVV 2.0mm2

Functions

Alarm delay/suppression/zero follwer

Power cable

CVV, etc. (1.25mm2 or 2.0mm2) - 2-core or 3-core

Power supply

100 - 110 VAC ±10%, 50/60 Hz

Power consumption

Maximum 13 VA

Cable connecting port

Pressure proof packing gland<G3/4>(Compatible cables φ9.0mm～φ16.0mm)

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)

Explosion-proof structure

Flame-proof enclosures

Explosion-proof class

Ex d ⅡB+H2 T4 Gb

IP rating

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.

67

SD-D58 Series

10 Product Specifications

10-1. List of specifications[SD-D58・DC・NP] ＜Bar terminal, TIIS Specifications＞
Model

SD-D58・DC・NP

Detection principle

Thermal conductivy type

Detection gas

Combustible gas in the air or inert gas

Display

Seven-segment LED (four-digit)

Detection range

Depend on detection gas

Resolution

Depend on detection gas

Detection method

Sample-drawing

Flow rate

1.5 L/min or more (at maximum suction pressure of 5.0 kPa <gauge pressure>)

Alarm setpoints

Depend on detection gas

Power display

POWER lamp on (green)

External output

Gas concentration signal/alarm contact (gas alarm or fault alarm, gas/fault common
alarm)

Alarm accuracy (under thesame conditions)

Within ±25% to the alarm setpoint value

Response time (under thesame conditions)

Within 30 seconds after providing the gas 1.6 times the alarm setpoint (excluding
delay in the tube)

Gas alarm typeOne-step alarm (H)Gas alarm display

ALM lamp on (red)Gas alarm pattern

Non latching (Auto-reset)

Fault alarm/self diagnosis

System abnormalities/sensor abnormalities/low flow rates(Option)

Fault alarm display

FAULT lamp on (yellow)/detail display

Fault alarm pattern

Non latching (Auto-reset)

Alarm contact

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 systemthree-wire type analog transmission (common cable for power and signal<power,
signal, common>)Transmission specifications

4 - 20 mA DC (no-insulation/load resistance under 300 Ω)Power/contact/transmission
cable

Shielded cable of CVVS, etc. (1.25mm2 or 2.0mm2) - 3-core (when the contact 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 CVV 1.25mm2
Less than 450m in case of CVV 2.0mm2

Functions

Alarm delay/suppression/zero follwer

Power supply

24 VDC ±10%Power consumption

Maximum 8.7W

Cable connecting port

Pressure proof packing gland<G3/4>(Compatible cables φ9.0mm～φ16.0mm)

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 - +53ºC (Non-rapidly-vary)

Operating humidity

Below 95% RH (Non-condensing)

Structure

Wall mounting type (2B<50A> pipe installation supported)

Explosion-proof structure

Flame-proof enclosures

Explosion-proof class

Ex d ⅡB+H2 T4 Gb

IP rating

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.

SD-D58 Series

6810 Product Specifications

10-1. List of specifications[SD-D58・DC・NP(TYPE H)] ＜Bar terminals, TIIS Specifications＞
Model

SD-D58・DC・NP

Type

TYPE H

Detection principle

Thermal conductivy type

Detection gas

Combustible gas in the air or inert gas

Display

Seven-segment LED (four-digit)

Detection range

Depend on detection gas

Resolution

Depend on detection gas

Detection method

Sample-drawing

Flow rate

1.5 L/min or more (at maximum suction pressure of 5.0 kPa <gauge pressure>)

Alarm setpoints

Depend on detection gas

Power display

POWER lamp on (green)

External output

Gas concentration signal/alarm contact (gas alarm or fault alarm, gas/fault common
alarm)

Alarm accuracy (under thesame conditions)

Within ±25% to the alarm setpoint value

Response time (under thesame conditions)

Within 30 seconds after providing the gas 1.6 times the alarm setpoint (excluding
delay in the tube)

Gas alarm typeOne-step alarm (H)Gas alarm display

ALM lamp on (red)Gas alarm pattern

Non latching (Auto-reset)

Fault alarm/self diagnosis

System abnormalities/sensor abnormalities/low flow rates

Fault alarm display

FAULT lamp on (yellow)/detail display

Fault alarm pattern

Non latching (Auto-reset)

Alarm contact

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 type analog transmission (common cable for power and signal<power,
signal, common>)Transmission specifications

4 - 20mADC (no-insulation/load resistance under 300Ω)/HART7(HART communication)

Power/contact/transmission
cable

Shielded cable of CVVS, etc. (1.25mm2 or 2.0mm2) - 3-core (when the contact 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 CVV 1.25mm2
Less than 450m in case of CVV 2.0mm2

Functions

Alarm delay/suppression/zero follwer

Power supply

24 VDC ±10%Power consumption

Maximum 8.7W

Cable connecting port

Pressure proof packing gland<G3/4>(Compatible cables φ9.0mm～φ16.0mm)

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 - +53ºC (Non-rapidly-vary)

Operating humidity

Below 95% RH (Non-condensing)

Structure

Wall mounting type (2B<50A> pipe installation supported)

Explosion-proof structure

Flame-proof enclosures

Explosion-proof class

Ex d ⅡB+H2 T4 Gb

IP rating

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.

69

SD-D58 Series

10 Product Specifications

10-1. List of specifications[SD-D58・DC-Z・NP] ＜Round terminal, TIIS Specifications＞
Model

SD-D58・DC-Z・NP

Detection principle

Thermal conductivy type

Detection gas

Combustible gas in the air or inert gas

Display

Seven-segment LED (four-digit)

Detection range

Depend on detection gas

Resolution

Depend on detection gas

Detection method

Sample-drawing

Flow rate

1.5 L/min or more (at maximum suction pressure of 5.0 kPa <gauge pressure>)

Alarm setpoints

Depend on detection gas

Power display

POWER lamp on (green)

External output

Gas concentration signal/alarm contact (gas alarm or fault alarm, gas/fault common
alarm)

Alarm accuracy (under thesame conditions)

Within ±25% to the alarm setpoint value

Response time (under thesame conditions)

Within 30 seconds after providing the gas 1.6 times the alarm setpoint (excluding
delay in the tube)

Gas alarm typeOne-step alarm (H)Gas alarm display

ALM lamp on (red)Gas alarm pattern

Non latching (Auto-reset)

Fault alarm/self diagnosis

System abnormalities/sensor abnormalities/low flow rates(Option)

Fault alarm display

FAULT lamp on (yellow)/detail display

Fault alarm pattern

Non latching (Auto-reset)

Alarm contact

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 type analog transmission (common cable for power and signal<power,
signal, common>)Transmission specifications

4 - 20mADC (no-insulation/load resistance under 300Ω)Power/contact/transmission
cable

Shielded cable of CVVS, etc. (1.25mm2) - 3-core (when the contact is not used)
Shielded cable of CVVS, etc. (1.25mm2) - 5-core (when the contact is used)

Transmission distanceLess than 250m in case of CVV 1.25mm2

Functions

Alarm delay/suppression/zero follwer

Power supply

24 VDC ±10%Power consumption

Maximum 8.7W

Cable connecting port

Pressure proof packing gland<G3/4>(Compatible cables φ9.0mm～φ16.0mm)

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 - +53ºC (Non-rapidly-vary)

Operating humidity

Below 95% RH (Non-condensing)

Structure

Wall mounting type (2B<50A> pipe installation supported)

Explosion-proof structure

Flame-proof enclosures

Explosion-proof class

Ex d ⅡB+H2 T4 Gb

IP rating

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.

SD-D58 Series

70

10 Product Specifications

10-1. List of specifications[SD-D58・DC-Z・NP(TYPE H)] ＜Round terminal, TIIS Specifications＞
Model

SD-D58・DC-Z・NP

Type

TYPE H

Detection principle

Thermal conductivy type

Detection gas

Combustible gas in the air or inert gas

Display

Seven-segment LED (four-digit)

Detection range

Depend on detection gas

Resolution

Depend on detection gas

Detection method

Sample-drawing

Flow rate

1.5 L/min or more (at maximum suction pressure of 5.0 kPa <gauge pressure>)

Alarm setpoints

Depend on detection gas

Power display

POWER lamp on (green)

External output

Gas concentration signal/alarm contact (gas alarm or fault alarm, gas/fault common
alarm)

Alarm accuracy (under thesame conditions)

Within ±25% to the alarm setpoint value

Response time (under thesame conditions)

Within 30 seconds after providing the gas 1.6 times the alarm setpoint (excluding
delay in the tube)

Gas alarm typeOne-step alarm (H)Gas alarm display

ALM lamp on (red)Gas alarm pattern

Non latching (Auto-reset)

Fault alarm/self diagnosis

System abnormalities/sensor abnormalities/low flow rates

Fault alarm display

FAULT lamp on (yellow)/detail display

Fault alarm pattern

Non latching (Auto-reset)

Alarm contact

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 type analog transmission (common cable for power and signal<power,
signal, common>)Transmission specifications

4 - 20mADC (no-insulation/load resistance under 300Ω)/HART7(HART communication)

Power/contact/transmission
cable

Shielded cable of CVVS, etc. (1.25mm2) - 3-core (when the contact is not used)
Shielded cable of CVVS, etc. (1.25mm2) - 5-core (when the contact is used)

Transmission distanceLess than 250m in case of CVV 1.25mm2

Functions

Alarm delay/suppression/zero follwer

Power supply

24 VDC ±10%Power consumption

Maximum 8.7W

Cable connecting port

Pressure proof packing gland<G3/4>(Compatible cables φ9.0mm～φ16.0mm)

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 - +53ºC (Non-rapidly-vary)

Operating humidity

Below 95% RH (Non-condensing)

Structure

Wall mounting type (2B<50A> pipe installation supported)

Explosion-proof structure

Flame-proof enclosures

Explosion-proof class

Ex d ⅡB+H2 T4 Gb

IP rating

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

SD-D58 Series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 Appearance

73

SD-D58 Series

11 Definition of Terms

11

Definition of Terms
ThermalConductivity

This is a principle of the sensor installed in the detector.
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

SD-D58 Series

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.

74

Revision History
Issue
0

Revision details
First issue

Issue date
8/20/2020