Hydrogen Detector & Alarm – H2 Gas Leak Sensor for UPS, Battery Room Application

High Accuracy, Long Life, Advanced Technology, Catalytic Pellistor,  in Low price  Hydrogen Detector for UPS, Battery Room Application .

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  Indoor, Outdoor and 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.

online, continuous monitoring of hydrogen LEL or flammability level, wall or duct mount, with/without display & relays, ATEX, IECEX certified with safety integrity level SIL 2, Indoor, Outdoor and explosion proof for Zone 1, 2

Model: MA, MC2, SC2 and PX2 Series

IMG_20170405_133050716 MC2 H2 sensor IP65 Gas-Sensor MC2 - sensor

Hydrogen sensor transmitter – non-flameproof, flameproof LEL detector for Zone 1 with ATEX, IECEX, SIL 2 certificate, display, relays

Hydrogen gas detector series is highly robust, industrial grade,non-flameproof, 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  terms in ambient air or in duct or pipeline. It is ATEX EEx’d’ certified with SIL 2 safety integrity level for hazardous area installation Zone 1 and 2.

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.

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 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 TUV certified,IECEX, SIL 2
  • RS485 serial interface with Modbus RTU communication (optional)
  • 1 or 3 relay output module (optional)
  • System and alarm LED indicators (optional)
  • Modbus RTU communication over RS485 serial interface

Technical Specifications:

  • Measuring Parameters: hydrogen gas flammability or leakage
  • Sensor Technology: Catalytic bead based pellistor sensor cell
  • Measuring range: 0 ~ 100 % LEL
  • Response time (t90): < 10 sec
  • Control unit: 12 bit microprocessor based
  • Warm up time: < 5 mins
  • Auto zero point tracking for drift compensation
  • Power supply: 24 VDC
  • Ingress protection: IP44, IP 54, IP 65, IP 66
  • Enclosure: Stainless steel (for sensor cell), Cast Aluminium (for transmitter), polycarbonate material
  • Output: linear, proportional 4-20mA or 2-10Vdc
  • Mounting: wall, duct, pipeline
  • Safety integrity level: SIL 2
  • 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 details please feel free to contact us

For Technical Datasheet Please Click Here 

Application of MSR H2 Sensor Transmitter in Battery Room

As lead acid batteries are charged, minute quantities of hydrogen (H2) gas are produced. Normally, the amount of  hydrogen generated during charging is not of a sufficient quantity to cause concern. There are instances however, where for various reasons, hydrogen may accumulate to create potentially hazardous gas conditions.

Battery back-up installations for equipment such as telephone switching systems and computers are normally situated in small rooms with little ventilation. This confined space provides an excellent opportunity for hydrogen to accumulate and reach combustible levels.

In most instances, the sensor/transmitter is mounted on the ceiling, while the monitoring panel is mounted outside the room. Any build-up will cause an alarm and/or initiate ventilation.

MC2 Pic

A second common application is in warehouses where battery powered forklifts are used. Charging stations are commonly lined up in areas where a large number of vehicles can be charged simultaneously. Because of the size and number of batteries, dangerous levels of H2 can accumulate.

Key Factors:

  • Relative density of hydrogen is 0.069. Therefore sensors should be mounted at or near the ceiling, away from any source of fresh air, which may dilute the sample.
  • Remote sensors are normally used, with panels being mounted away from hydrogen source.
  • The customer chose MSR catalytic diffusion system to monitor the battery rooms for hydrogen in the 0-100% LEL range.
  • The MSR H2 sensors like MA-series, MC2-series and Poly-Xeta 2 series are used for monitoring battery recharging areas.
  • The Sensors are employed for detecting hydrogen concentration in the air
  • This explosive hydrogen gas is produced during battery charging.
  • MSR sensors protect person and equipment against explosions caused by ignition of the hydrogen gas.
  • MSR MA-series and latest MC2-series are suggested for battery room application like data center inside a commercial building .
  • MSR Poly-Xeta 2 series are usually suggested for battery room applicator in Industries /Plants . Some industries include: Telecommunications/Computing Utilities, Financial Services, Publishing Transportation Services , Automotive.

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