Model

KD-12A

KD-12B

KD-12C

Target Gas

Combustible Gas / Toxic Gas 

Hydrogen / Helium / Carbon Dioxide, etc.

Sensor Type

Hot wire semiconductor

Catalytic

Thermal conductivity

Detection Range

ppm

%LEL

Vol%

Detection Method

Diffusion type  

Alarm Set Value

Set to user specifications  

Alarm Accuracy

• Combustible gas: ±25% of alarm set value under stable conditions
• Toxic gas: ±30% of alarm set value under stable conditions  

Alarm Delay

• Combustible gas: within 30 seconds at 1.6 times the alarm set value concentration
• Toxic gas: within 60 seconds at 1.6 times the alarm set value concentration  

Alarm Display

• Gas alarm: Red LED lamp flashing
• Trouble alarm: Yellow LED lamp flashing (sensor disconnection, sensor zero drop, power voltage abnormality, etc.)  

Gas Concentration Display

LED display: 4-digit digital display  

External Outputs

• Gas concentration analog signal: DC4-20mA (common to negative side of powersupply)
  
  
• Gas alarm contact *1 : 1a non-voltage contact / automatic return(Rated load: AC250V 0.5A or DC30V 0.5A (resistive load))

For KD-12AH/BH (HART Signal)

• DC4-20mA (shared with the negative power source)
• HART signal Protocol 7.5 *Burst mode not supported
• 1a non-voltage contact/ automatic return
  - Rated load: AC250V 3.0A or DC30V 3.0A (resistive load)  

Approvals

Explosion Proof
II2 G Ex db IIC T5 Gb (ATEX)
Ex db IIC T5 Gb (IECEx)
Ex d IIC T5 (Japan Ex)
CE / SIL2  

Protection Rating

IP65  

Method of Operation

4 magnetic switches  

Compatible Cables

Cable outer diameter: Ø10 to Ø13
5-core shielded cable *1 : CVV- S1.25mm²
3-core shielded cable: CVV- S2mm2 or 1.25mm²  

Power Supply

DC24V (±20%)  

Power Consumption

Maximum 3W  

Operating Temperature and Humidity

Temperature: -10 to 50°C
Humidity: 10 to 90% RH (0 to 50°C)  

External Dimensions

W158×H116×D68 mm (excluding protrusions)  

Weight

Approx. 1.2 kg