Gas Detection and Alarm Systems

Gas detector for use in furnace KD-12HT


  • Perform reliable detection of concentration in the furnace
  • The sensor unit is available in an environment of 160 ℃
  • Display function shows gas concentration and alarm status at a glance
  • Various adjustments can be operated on site with a single magnet stick
  • The display is rotated 90 degrees to the left and right
  • Available in two types: Straight type (KD-12HT-T) and L-shaped type (KD-12HT-L)


Model KD-12HT-T KD-12HT-L
Detection Principle Catalytic sensor
Target Gas N-Methyl-2-Pyrrolidone (NMP)
Sampling Method Diffusion
Detection Range 0-100%LEL
Alarm Set Value As per specifications
Alarm Accuracy ±25% of alarm set value
Alarm Delay Less than 30 seconds with a gas concentration that is 1.6 times higher than the alarm set
Alarms ・During gas alarm (single stage only), the red ALARM LED blinks.
·During trouble alarm in the event of sensor disconnection, zero drift, power supply voltage error, internal EEPROM communication error, the amber TROUBLE LED blinks.
Display 4-digit seven segment LED display
Output <Gas concentration analog signal >
·4-20 mA DC (common negative with power supply)
·0.9 mA or less in the event of trouble alarm
·Load resistance of the analog signal line, including the resistance of the wire, is not more than 300 ohm
<Gas alarm contact (single stage only)>
·Normally open or normally closed dry contact *1 ; normally energized or normally de energized *1 ; automatic resetting
·Max. load: 0.5 A resistive at 250 VAC or 0.5 A resistive at 30 VDC
Explosion-proof ATEX: II 2 G Ex db IIC T3 Gb
IECEx: Ex db IIC T3 Gb
Approvals EU type examination certificate: CML 21ATEX1411X

UK type examination certificate: CML 22UKEX1374X
IECEx certificate No.: CML 21.0055X

Harmonised/Designated Standards EN IEC 60079-0:2018
EN 60079-1:2014
IEC 60079-0:2017 Edition 7.0
IEC 60079-1:2014 Edition 7.0
Applicable Cable Cable outer diameter: 10 mm to 13 mm
・5-wire CCV-S cable (power, analog signal and relay contact)
Wire size: 1.25 mm²
·3-wire CCV-S cable (power and analog signal)
Wire size: 1.25 mm² or 2 mm²
Operating Temperature/Humidity Main body: -10 to 50 °C
Probe: 0 to 160 °C
10% to 90% RH at 0 to 50 °C
No sudden temperature or humidity changes. No condensation
Power Supply 24 VDC (18 to 30 VDC)
Power Consumption 1.5 W during normal operation (Max. 3 W)
Dimensions W127 x H530 x D68 mm (Excluding
protruding parts and including probe)
Probe size inside the furnace: Dia.34 x 250 mm
Flange size: 25A or 50A
W127 x H321 x D443 mm (Excluding
protruding parts and including probe)
Probe size inside the furnace: Dia.34 x 250 mm
Flange size: 25A or 50A
Weight Approx. 3.6 kg with 25A flange
Approx. 4.2 kg with 50A flange
Approx. 4.1 kg with 25A flange
Approx. 4.9 kg with 50A flange
Mounting method Using a flange

-The above specifications are subject to change without notice.

-If your specifications are nonstandard, refer to the delivery specifications.

*1 Specified at the time of order.

Connectable Alarm Units

UV-810(Multi-point)、V3 typeMNV-100M(One-point)


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Type Approved by IECEx Explosion-proof certification


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