RSE-0335-2
GAS DETECTOR HEAD
GD-70D(ESU) SPECIFICATION
Model
Detection principle
Detectable gas*
Gas concentration display
Measuring range*
Detection method
Suction flow
Alarm preset point
Power indication
Various indications
OutputAlarm accuracy

GD-70DElectrochemical method
Toxic gas
LCD(digital and bar-meter display)
Depend on Detectable gas
Pump suction method
0.5L/min±10%
Depend on Detectable gas
POWER lamp lighting(green)
Gas/Flow/ModeGas concentration signal/Gas alarm contact/Trouble alarm contact
Less than ±30%(against alarm preset point)(under an identical condition)

Alarm-delay time
(under an identical condition)

Gas alarm typeGas alarm indication
Gas alarm action
Gas alarm contact*

Trouble alarm・Self diagnosis
Trouble alarm indication
Trouble alarm action
Trouble alarm contact*

Contact capacity
Contact cable
Transmission scheme
Specification oftransmission
Transmission cable
Various functions
Power cable
Power supply
Power consumption
Piping port
Initial clear
Operating temperature
Operating humidity
Structure
Outer dimension
WeightColorLess than 60sec(when introducing 1.6 times thicker gas than alarm preset
point)(without piping delay time)Two-level alarm(H-HH)
1st：ALM1 lamp lighting(red)2nd：ALM2 lamp lighting(red)Auto-recover
Each no-voltage contact 1a or 1b(contact output for each alarm)
Non-exciting at normal(exciting at alarm) or exciting at
normal(non-exciting at alarm)
System failure/Sensor failure/Flow failure
FAULT lamp lighting(yellow)/content display
Auto-recoverNo-voltage contact 1a or 1b
Non-exciting at normal(exciting at alarm) or exciting at
normal(non-exciting at alarm)
DC24V・0.5A(load resistance)
CVV worth cable(1.25sq)・MAX.6-core
Three-wire analog transmission(in common with power supply<power
supply,signal,common>) or two-wire analog transmission
DC4～20mA(non-isolated・load resistance less than 300Ω)
CVVS worth of shield cable(1.25sq)・3-core or 2-core
White backlight/Alarm delay/Suppress/Zero tracking/Span assist/
Flow control/Proofreading history/Alarm trend history/Event history
CVV worth of cable (1.25sq)・2-core(three-wire analog transmission isin common with transmission cable)
DC24V±10%
Approx.1.5W(MAX.4W)
Rc1/4(PP half union<for O.Dφ6-1t>is provided as standard accessories.)
Approx.25sec
0～40℃(non-rapidly-vary. It may differ according to mounted sensor.)
30～70%RH(non-condensing. It may differ according to mounted sensor.)
Box type・Wall mounting type
Approx.70(W)×120(H)×145(D)mm(projection excluding)Approx.0.9kg
Body：gray
Front door：white* Please specify your request when ordering.

RSE-0335-2
Outline Drawings

Terminal Drawings

1
+
24VDC

2

3

4

-

+
4-20mA

5

6

ALM1 contact

7

8

ALM2 contact

9

10

FAULT contact※For the 3-wire type (4 - 20 mA), the terminal 2 is used for common, and the terminals 2(-) and 3(+) are used to
output 4 - 20 mA.

RSE-0655-1
GAS DETECTOR HEAD
GD-70D(ESU・Anoxia alarm) SPECIFICATION
Model
Detection principle
Detectable gas
Gas concentration display
Measuring range*1
Detection method
Suction flow
Alarm setpoint*1
Power indication
Various indications
OutputAlarm accuracy*2

GD-70DElectrochemical method
Oxygen
LCD(digital and bar-meter display)
0～25vol%
Pump suction method
0.5L/min±10%
1st 18vol%（L）/ 2nd 18vol%（L）［Standard］
POWER lamp lighting(green)
Gas/Flow/ModeGas concentration signal/Gas alarm contact/Trouble alarm contact
Less than ±0.7vol%(under an identical condition)

Accuracy of Alarm setpoint*2
Response time*2

Difference between Alarm setpoint and indicated value of warning alarm
are zero.
Less than 30sec(T90)(without piping delay time)(under an identical condition)

Alarm-delay time*2(under an identical condition)

Gas alarm typeGas alarm indication
Gas alarm action
Gas alarm contact*1

Trouble alarm・Self diagnosis
Trouble alarm indication
Trouble alarm action
Trouble alarm contact*1

Contact capacity
Contact cable
Transmission scheme
Specification oftransmission
Transmission cable
Various functions
Power cable
Power supply
Power consumption
Piping port
Initial clear
Operating temperature
Operating humidity
Structure
Outer dimension
WeightColor

By anoxia alarm(Alarm setpoint：18vol%),less than 5sec(when introducing
10～11vol% gas)(without piping delay time)Two-level alarm(L-LL)
1st：ALM1 lamp lighting(red)2nd：ALM2 lamp lighting(red)Auto-recover
Each no-voltage contact 1a or 1b(contact output for each alarm)
Non-exciting at normal(exciting at alarm) or exciting at
normal(non-exciting at alarm)
System failure/Sensor failure/Flow failure
FAULT lamp lighting(yellow)/content display
Auto-recoverNo-voltage contact 1a or 1b
Non-exciting at normal(exciting at alarm) or exciting at
normal(non-exciting at alarm)
DC24V・0.5A(load resistance)
CVV worth cable(1.25sq)・MAX.6-core
Three-wire analog transmission(in common with power supply<power
supply,signal,common>) or two-wire analog transmission
DC4～20mA(non-isolated・load resistance less than 300Ω)
CVVS worth of shield cable(1.25sq)・3-core or 2-core
White backlight/Alarm delay/Suppress/Zero tracking/Span assist/
Flow control/Proofreading history/Alarm trend history/Event history
CVV worth of cable (1.25sq)・2-core(three-wire analog transmission isin common with transmission cable)
DC24V±10%
Approx.1.5W(MAX.4W)
Rc1/4(PP half union<for O.Dφ6-1t>is provided as standard accessories.)
Approx.25sec-10～40℃(non-rapidly-vary. It may differ according to mounted sensor.)
6～88%RH(non-condensing. It may differ according to mounted sensor.)
Box type・Wall mounting type
Approx.70(W)×120(H)×145(D)mm(projection excluding)Approx.0.9kg
Body：gray
Front door：white*1 Please specify your request when ordering.
*2 In conformity to JIS T8201 2010(Oxygen deficiency indicator).

RSE-0655-1
Outline Drawings

Terminal Drawings

1
+
24VDC

2

3

4

-

+
4-20mA

5

6

ALM1 contact

7

8

ALM2 contact

9

10

FAULT contact※For the 3-wire type (4 - 20 mA), the terminal 2 is used for common, and the terminals 2(-) and 3(+) are used to
output 4 - 20 mA.

RSE-0338-2
GAS DETECTOR HEAD
GD-70D(SGU) SPECIFICATION
Model
Detection principle
Detectable gas*
Gas concentration display
Measuring range*
Detection method
Suction flow
Alarm preset point*
Power indication
Various indications
OutputAlarm accuracy*(under an identical condition)

Alarm-delay time*(under an identical condition)

Gas alarm typeGas alarm indication
Gas alarm action
Gas alarm contact*

Trouble alarm・Self diagnosis
Trouble alarm indication
Trouble alarm action
Trouble alarm contact*

Contact capacity
Contact cable
Transmission scheme
Specification oftransmission
Transmission cable
Various functions
Power cable
Power supply
Power consumption
Piping port
Initial clear
Operating temperature
Operating humidity
Structure
Outer dimension
WeightColor

GD-70D
Semi-conductor method
Combustible gas/Toxic gas
LCD(digital and bar-meter display)
Depend on Detectable gas
Pump suction method
0.5L/min±10%
Depend on Detectable gas
POWER lamp lighting(green)
Gas/Flow/ModeGas concentration signal/Gas alarm contact/Trouble alarm contact
Combustible gas：Less than ±25%(against alarm preset point)
Toxic gas：Less than ±30%(against alarm preset point)
Less than 30sec or 60sec(when introducing 1.6 times thicker gas than alarm preset point)(depends
on gas)(without piping delay time)Two-level alarm(H-HH)
1st：ALM1 lamp lighting(red)2nd：ALM2 lamp lighting(red)Auto-recover
Each no-voltage contact 1a or 1b(contact output for each alarm)
Non-exciting at normal(exciting at alarm) or exciting at
normal(non-exciting at alarm)
System failure/Sensor failure/Flow failure
FAULT lamp lighting(yellow)/content display
Auto-recoverNo-voltage contact 1a or 1b
Non-exciting at normal(exciting at alarm) or exciting at
normal(non-exciting at alarm)
DC24V・0.5A(load resistance)
CVV worth cable(1.25sq)・MAX.6-core
Three-wire analog transmission(in common with power supply<power
supply,signal,common>) or two-wire analog transmission
DC4～20mA(non-isolated・load resistance less than 300Ω)
CVVS worth of shield cable(1.25sq)・3-core or 2-core
White backlight/Alarm delay/Suppress/Flow control/
Proofreading history/Alarm trend history/Event history
CVV worth of cable (1.25sq)・2-core(three-wire analog transmission isin common with transmission cable)
DC24V±10%
Approx.2.5W(MAX.5W)
Rc1/4(PP half union<for O.Dφ6-1t>is provided as standard accessories.)
Approx.25sec
0～40℃(non-rapidly-vary)Less than 95%RH(non-condensing)Box type・Wall mounting type
Approx.70(W)×120(H)×145(D)mm(projection excluding)Approx.0.9kg
Body：gray
Front door：white* Please specify your request when ordering.

RSE-0338-2
Outline Drawings

Terminal Drawings

1

2

3

+

-

+
4-20mA

24VDC

4

5

6

7

8

ALM1 contact ALM2 contact

9

10

FAULT
contact※For the 3-wire type (4 - 20 mA), the terminal 2 is used for common, and the terminals 2(-) and 3(+)
are used to output 4 - 20 mA.

RSE-0339-3
GAS DETECTOR HEAD
GD-70D(OSU・Anoxia alarm) SPECIFICATION
Model
Detection principle
Detectable gas
Gas concentration display
Measuring range
Detection method
Suction flow
Alarm preset point*1
Power indication
Various indications
OutputIndicate accuracy*2

GD-70D
Galvanic cell method
O2
LCD(digital and bar-meter display)
0～25vol%
Pump suction method
0.5L/min±10%
18vol%(1st<L>)/18vol%(2nd<LL>)【Standard】
POWER lamp lighting(green)
Gas/Flow/ModeGas concentration signal/Gas alarm contact/Trouble alarm contact
Less than ±0.7vol%(under an identical condition)

Accuracy of Alarm setpoint*2
Response time*2

Difference between Alarm setpoint and indicated value of warning alarm
are zero.
Less than 30sec(T90)(without piping delay time)(under an identical condition)

Alarm-delay time*2(under an identical condition)

Gas alarm typeGas alarm indication
Gas alarm action
Gas alarm contact*1

Trouble alarm・Self diagnosis
Trouble alarm indication
Trouble alarm action
Trouble alarm contact*1

Contact capacity
Contact cable
Transmission scheme
Specification oftransmission
Transmission cable
Various functions
Power cable
Power supply
Power consumption
Piping port
Initial clear
Operating temperature
Operating humidity
Structure
Outer dimension
WeightColor

By anoxia alarm(Alarm preset point ： 18vol%),less than 5sec(whenintroducing 10～11vol% gas)(without piping delay time)Two-level alarm(L-LL or L-H)
1st：ALM1 lamp lighting(red)2nd：ALM2 lamp lighting(red)Auto-recover
Each no-voltage contact 1a or 1b(contact output for each alarm)
Non-exciting at normal(exciting at alarm) or exciting at
normal(non-exciting at alarm)
System failure/Sensor failure/Flow failure
FAULT lamp lighting(yellow)/content display
Auto-recoverNo-voltage contact 1a or 1b
Non-exciting at normal(exciting at alarm) or exciting at
normal(non-exciting at alarm)
DC24V・0.5A(load resistance)
CVV worth cable(1.25sq)・MAX.6-core
Three-wire analog transmission(in common with power supply<power
supply,signal,common>) or two-wire analog transmission
DC4～20mA(non-isolated・load resistance less than 300Ω)
CVVS worth of shield cable(1.25sq)・3-core or 2-core
White backlight/Alarm delay/Suppress/Flow control/
Proofreading history/Alarm trend history/Event history
CVV worth of cable (1.25sq)・2-core(three-wire analog transmission isin common with transmission cable)
DC24V±10%
Approx.1.5W(MAX.4W)
Rc1/4(PP half union<for O.Dφ6-1t>is provided as standard accessories.)
Approx.25sec
0～40℃(non-rapidly-vary)Less than 95%RH(non-condensing)Box type・Wall mounting type
Approx.70(W)×120(H)×145(D)mm(projection excluding)Approx.0.9kg
Body：gray
Front door：white*1 Please specify your request when ordering.
*2 In conformity to JIS T8201 2010(Oxygen deficiency indicator).

RSE-0339-3
Outline Drawings

Terminal Drawings

1

2

3

+

-

+
4-20mA

24VDC

4

5

6

7

8

ALM1 contact ALM2 contact

9

10

FAULT
contact※For the 3-wire type (4 - 20 mA), the terminal 2 is used for common, and the terminals 2(-) and 3(+)
are used to output 4 - 20 mA.

RSE-0340-1
GAS DETECTOR HEAD
GD-70D(OSU・Gas monitoring) SPECIFICATION
Model
Detection principle
Detectable gas
Gas concentration display
Measuring range
Detection method
Suction flow
Alarm preset point*
Power indication
Various indications
OutputIndicate accuracy(under an identical condition)

Response time

GD-70D
Galvanic cell method
O2
LCD(digital and bar-meter display)
0～5vol%/0～25vol%/0～50vol%/0～100vol%
Pump suction method
0.5L/min±10%
Depend on measuring range
POWER lamp lighting(green)
Gas/Flow/ModeGas concentration signal/Gas alarm contact/Trouble alarm contact
Less than ±0.7vol%(below 25vol% range)
Less than ±3vol%(above 25vol% range)
Less than 30sec(T90)(without piping delay time)(under an identical condition)

Gas alarm type*Gas alarm indication
Gas alarm action
Gas alarm contact*

Trouble alarm・Self diagnosis
Trouble alarm indication
Trouble alarm action
Trouble alarm contact*

Contact capacity
Contact cable
Transmission scheme
Specification oftransmission
Transmission cable
Various functions
Power cable
Power supply
Power consumption
Piping port
Initial clear
Operating temperature
Operating humidity
Structure
Outer dimension
WeightColor

Two-level alarm(H-HH or L-H,L-LL)
1st：ALM1 lamp lighting(red)2nd：ALM2 lamp lighting(red)Auto-recover
Each no-voltage contact 1a or 1b(contact output for each alarm)
Non-exciting at normal(exciting at alarm) or exciting at normal(non-exciting at alarm)
System failure/Sensor failure/Flow failure
FAULT lamp lighting(yellow)/content display
Auto-recoverNo-voltage contact 1a or 1b
Non-exciting at normal(exciting at alarm) or exciting at normal(non-exciting at alarm)
DC24V・0.5A(load resistance)
CVV worth cable(1.25sq)・MAX.6-core
Three-wire analog transmission(in common with power supply<power
supply,signal,common>) or two-wire analog transmission
DC4～20mA(non-isolated・load resistance less than 300Ω)
CVVS worth of shield cable(1.25sq)・3-core or 2-core
White backlight/Alarm delay/Suppress/Flow control/
Proofreading history/Alarm trend history/Event history
CVV worth of cable (1.25sq)・2-core(three-wire analog transmission isin common with transmission cable)
DC24V±10%
Approx.1.5W(MAX.4W)
Rc1/4(PP half union<for O.Dφ6-1t>is provided as standard accessories.)
Approx.25sec
0～40℃(non-rapidly-vary)Less than 95%RH(non-condensing)Box type・Wall mounting type
Approx.70(W)×120(H)×145(D)mm(projection excluding)Approx.0.9kg
Body：gray
Front door：white* Please specify your request when ordering.

RSE-0340-1
Outline Drawings

Terminal Drawings

1

2

3

+

-

+
4-20mA

24VDC

4

5

6

7

8

ALM1 contact ALM2 contact

9

10

FAULT
contact※For the 3-wire type (4 - 20 mA), the terminal 2 is used for common, and the terminals 2(-) and 3(+)
are used to output 4 - 20 mA.

RSE-0355-2
GAS DETECTOR HEAD
GD-70D(NCU) SPECIFICATION
Model
Detection principle
Detectable gas*
Gas concentration display
Measuring range*
Detection method
Suction flow
Alarm preset point*
Power indication
Various indications
OutputAlarm accuracy

GD-70DNew ceramic catalytic method
Combustible gas
LCD(digital and bar-meter display)
Depend on Detectable gas
Pump suction method
0.5L/min±10%
Depend on Detectable gas
POWER lamp lighting(green)
Gas/Flow/ModeGas concentration signal/Gas alarm contact/Trouble alarm contact
Less than ±25%(against alarm preset point)(under an identical condition)

Alarm-delay time
(under an identical condition)

Gas alarm typeGas alarm indication
Gas alarm action
Gas alarm contact*

Trouble alarm・Self diagnosis
Trouble alarm indication
Trouble alarm action
Trouble alarm contact*

Contact capacity
Contact cable
Transmission scheme
Specification oftransmission
Transmission cable
Various functions
Power cable
Power supply
Power consumption
Piping port
Initial clear
Operating temperature
Operating humidity
Structure
Outer dimension
WeightColorLess than 30sec(when introducing 1.6 times thicker gas than alarm preset
point)(without piping delay time)Two-level alarm(H-HH)
1st：ALM1 lamp lighting(red)2nd：ALM2 lamp lighting(red)Auto-recover
Each no-voltage contact 1a or 1b(contact output for each alarm)
Non-exciting at normal(exciting at alarm) or exciting at
normal(non-exciting at alarm)
System failure/Sensor failure/Flow failure
FAULT lamp lighting(yellow)/content display
Auto-recoverNo-voltage contact 1a or 1b
Non-exciting at normal(exciting at alarm) or exciting at
normal(non-exciting at alarm)
DC24V・0.5A(load resistance)
CVV worth cable(1.25sq)・MAX.6-core
Three-wire analog transmission(in common with power supply<power
supply,signal,common>) or two-wire analog transmission
DC4～20mA(non-isolated・load resistance less than 300Ω)
CVVS worth of shield cable(1.25sq)・3-core or 2-core
White backlight/Alarm delay/Suppress/Zero tracking/Flow control/Proofreading history/Alarm trend history/Event history
CVV worth of cable (1.25sq)・2-core(three-wire analog transmission isin common with transmission cable)
DC24V±10%
Approx.3W(MAX.5.5W)
Rc1/4(PP half union<for O.Dφ6-1t>is provided as standard accessories.)
Approx.25sec
0～40℃(non-rapidly-vary)Less than 95%RH(non-condensing)Box type・Wall mounting type
Approx.70(W)×120(H)×145(D)mm(projection excluding)Approx.0.9kg
Body：gray
Front door：white* Please specify your request when ordering.

RSE-0355-2
Outline Drawings

Terminal Drawings

1

2

3

+

-

+
4-20mA

24VDC

4

5

6

7

8

ALM1 contact ALM2 contact

9

10

FAULT
contact※For the 3-wire type (4 - 20 mA), the terminal 2 is used for common, and the terminals 2(-) and 3(+)
are used to output 4 - 20 mA.

RSE-0842-1
GAS DETECTOR HEAD
GD-70D(SHU) SPECIFICATION
Model
Detection principle
Detectable gas
Gas concentration display
Measuring range
Detection method
Suction flow
Alarm preset point*
Power indication
Various indications
OutputAlarm accuracy

GD-70D
Hot wire semiconductor method
H2
LCD(digital and bar-meter display)
0-2000ppm
Pump suction method
0.5L/min±10%
1st：500ppm 2nd：1000ppm [Standard setting]
POWER lamp lighting(green)
Gas/Flow/ModeGas concentration signal/Gas alarm contact/Trouble alarm contact
Less than ±25%(against alarm preset point)(under an identical condition)

Alarm-delay time
(under an identical condition)

Gas alarm typeGas alarm indication
Gas alarm action
Gas alarm contact*

Trouble alarm・Self diagnosis
Trouble alarm indication
Trouble alarm action
Trouble alarm contact*

Contact capacity
Contact cable
Transmission scheme
Specification oftransmission
Transmission cable
Various functions
Power cable
Power supply
Power consumption
Piping port
Initial clear
Operating temperature
Operating humidity
Structure
Outer dimension
WeightColor*Less than 30sec(when introducing 1.6 times thicker gas than alarm preset point) (without
piping delay time)Two-level alarm(H-HH)
1st：ALM1 lamp lighting(red)2nd：ALM2 lamp lighting(red)Auto-recover
Each no-voltage contact 1a or 1b(contact output for each alarm)
Non-exciting at normal(exciting at alarm) or exciting at
normal(non-exciting at alarm)
System failure/Sensor failure/Flow failure
FAULT lamp lighting(yellow)/content display
Auto-recoverNo-voltage contact 1a or 1b
Non-exciting at normal(exciting at alarm) or exciting at
normal(non-exciting at alarm)
DC24V・0.5A(load resistance)
CVV worth cable(1.25 ㎜ 2)・MAX.6-core
Three-wire analog transmission(in common with power supply<power
supply,signal,common>) or two-wire analog transmission
DC4-20mA(non-isolated・load resistance less than 300Ω)
CVVS worth of shield cable(1.25 ㎜ 2)・3-core or 2-core
White backlight/Alarm delay/Suppress/Flow control/
Proofreading history/Alarm trend history/Event history
CVV worth of cable (1.25 ㎜ 2)・2-core(three-wire analog transmission isin common with transmission cable)
DC24V±10%
Approx.3W(MAX.5W)
Rc1/4(PP half union<for O.Dφ6-1t>is provided as standard accessories.)
Approx.25sec
0-40℃(non-rapidly-vary)Less than 95%RH(non-condensing)Box type・Wall mounting type
Approx.70(W)×120(H)×145(D)mm(projection excluding)Approx.0.9kg
Body：gray
Front door：white

Please specify your request when ordering.

RSE-0842-1
Outline Drawings

Terminal Drawings

1

2

3

+

-

+
4-20mA

24VDC

4

5

6

7

8

ALM1 contact ALM2 contact

9

10

FAULT
contact*For the 3-wire type (4 - 20 mA), the terminal 2 is used for common, and the terminals 2(-) and 3(+)
are used to output 4 - 20 mA.