ATEX, IECEX, SIL2, PESO Certified Hydrogen Gas Detector online LEL monitor for Zone1

Hydrogen sensor transmitter for online, continuous LEL or flammability detection in battery rooms, UPS rooms, cracking plants, hydrogenation plants, hydrogen gas bank etc. The detector is explosion proof ATEX, IECEX certified with SIL 2 safety level and suitable for installation in hazardous area Zone 1 and Zone 2.

It is available with LCD Display, onboard relay contacts, flashing alarm LEDs, auto diagnostic watch dog, non-intrusive calibration, with industry standard linear analog output.

Hydrogen sensor transmitter / detector – explosion proof, ATEX, Zone 1

online, continuous monitoring of hydrogen LEL or flammability level, wall or duct mount, with / without display & relays, ATEX certified with safety integrity level SIL 2, explosion proof for Zone 1, 2
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Model no: PX2-X-X-3440-XX 

Hydrogen gas detector, PX2 series is highly robust, industrial grade, flameproof or explosion proof gas detector for hydrogen LEL or flammability monitoring. It is used for online, continuous monitoring of hydrogen flammable concentration in %LEL or %Vol terms in ambient air or in duct or pipeline. It is ATEX Ex’d’ and Ex’n’ certified with SIL 2 safety integrity level for hazardous area installation Zone 1 and 2.
Explosion proof or flameproof gas sensor transmitter - ATEX, Zone 1, 2 for all toxic, flammable gas, oxygen
The sensor transmitter offers linear, proportional analog output in industry standard current signals, over measuring range of 0 ~ 100 % LEL (lower explosive limit). The detector works on highly sensitive catalytic bead based pellistor sensor cell, with low response time. It has unique feature of auto diagnostic watch dog with zero point tracking feature. Due to its 12-bit microprocessor based control unit, it offer high accuracy over long term. The detector is also equipped with sintered filter with flashback arrestor for enhanced safety



Hydrogen sensor transmitter – LEL detector, ATEX Zone 1,2 flameproof, with / without display

It also offers optional features like inbuilt LCD display, flashing alarm LEDs, onboard potential free relay contacts (24VDC @ 1 A), RS485 serial interface with Modbus RTU communication.

Key Features:

  • Catalytic bead based Pellistor sensor cell with low flash energy
  • 12-bit microprocessor control unit
  • Non-intrusive one man calibration via hall effect switches
  • ATEX, PESO, IEXEC, SIL2 certified explosion proof / flameproof, suitable for Zone 1, 2 gas explosion installation
  • Linear, proportional analog industry standard current output
  • Continuous system self-diagnosis with watch dog
  • Flashback arrestor with sintered filter
  • Auto Zero point tracking to zero point compensation
  • SIL 2 HW TUV certified
  • RS485 serial interface with Modbus RTU communication (optional)
  • 2 relay output module (optional)
  • System and alarm LED indicators (optional)
  • Modbus RTU communication over RS485 serial interface

PX2 Hazadous Gas DetectorIMG_6322 IMG_6325 IMG_6302

Hydrogen sensor transmitter – Flameproof, ATEX for Zone 1, 2 LEL monitor with catalytic sensor

Technical Specifications:

  • Measuring Parameters: hydrogen gas flammability or leakage
  • Sensor Technology: Catalytic bead based pellistor sensor cell
  • Measuring range: 0 ~ 100 % LEL ( 0 ~ 4% v/v @ STP)
  • Response time (t90): < 20 sec
  • Control unit: 12 bit microprocessor based
  • Auto zero point tracking for drift compensation
  • Power supply: 24 VDC
  • Ingress protection: IP66
  • Enclosure: Stainless steel (for sensor cell), anti-static epoxy coated metal alloy (for transmitter)
  • Output: linear, proportional 4-20mA
  • Mounting: wall, duct, pipeline
  • Safety integrity level: SIL 2
  • ATEX marking: CE 722 Ex II 2G EEx d IIC T6, CE 722 Ex II 3G EEx nA IIC T6
  • Optional: LCD Display, alarm LEDs, potential free relay contacts
  • Hazardous area: Zone 1, 2


  • Oil & Gas, Petrochemical, refinery
  • Battery rooms, UPS facility
  • Mobile switching center (MSC) of cellular / telecom site
  • Cracking plants
  • Hydrogenation plants
  • Chemicals
  • Cold stores
  • Pharmaceuticals, medicinal formulation

For more Information please contact us or mail us