Gas Detection and Alarm Systems

Extraction Type Gas Detector Head with Display PD-12 series


  • Small and lightweight with concentration and alarm display
  • Extraction type with hydrogen explosion proof (Ex d IIB + H2 T4X)
  • Detecting decreased flow rate function except PD-12C (option)
  • Environmental friendly product
  • Water and dust-proof construction (Degree of protection: IP65)


Model PD-12A PD-12B PD-12C
Detection Principle Hot wire semiconductor Catalytic combustion Thermal conductivity
Gas Detected As per specifications
Sampling Method As per specifications
Suction Flow Over 0.5L/min
Detection Range As per specifications
Alarm Set Value As per specifications
Alarm Accuracy Combustible gas: ±25% of alarm set value under identical conditions
Toxic gas: ±30% of alarm set value under identical conditions
Alarm Delay Combustible gas: Within 30 seconds with 1.6 times of alarm set conditions
Toxic gas: Within 60 seconds with 1.6 times of alarm set concentration
Alarms Gas alarm: Red LED lamp flashes
Trouble alarm: Yellow LED lamp flashes (sensor disconnection, sensor zero drop,power supply voltage error, etc.)
Display Four-digit digital LED display
Output Gas concentration analog signal
・4-20mADC (common to the negative side of power supply)
Gas alarm contact or failure contact*1 (one stage only)
・1a no-voltage contact output, Non-latching
・Rated load: 0.5A at 250VAC or 0.5A at 30VDC (resistance load)
Operation At 4 points of magnetic switches
Explosion-proof II 2G Ex d IIB + H2 T4 Gb (ATEX)*2
Ex d IIB + H2 T4 X (Japan EX)
Degree of Protection IP65
Applicable Cable Cable outer diameter: 10.5mm to 14.5mm
6-conductor shielded cable: CVV-S 1.25mm2 or 2.0mm2
-10 to +50 °C
10 to 90 %RH (0 to 50 °C)
Power Supply 24 VDC (±20%)
Power Consumption 7.5W max.
Dimensions W133 x H260 x D132 mm (excluding protrusions)
Weight Approx. 5.2kg

*1 Gas alarm contact is a standard issue. Please specify if you wish a failure contact.
*2 Some are not ATEX approved. For further information, please ask.
*3 No radical temperature or humidity changes and no condensing.

Connectable Alarm Units

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



  • CE marking
  • UKCA
  • IECEx
  • ATEX
  • China Ex (NEPSI)
  • Korea Ex (KOSHA)*
  • India Ex (PESO)
  • Taiwan Ex (ITLI)
  • Japan Ex

*Only PD-12A/B

Related Products

Contact Us

Product Category

Product Guide Download

Search by Keywords

Contact Us

Contact Us

For telephone inquiries, please call your nearest New Cosmos Electric office.

List of New Cosmos Electric Locations