LPG sensor transmitter – LEL detector with flameproof, ATEX, SIL 2, Zone 1

LPG sensor transmitter for online, continuous LEL / flammability or leakage detection in kitchen, canteen, LPG gas bank, bottling plants etc. The detector is explosion proof ATEX 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.


LPG sensor transmitter – explosion proof LEL / leakage detector – ATEX, SIL 2, Zone 1, 2

pdf-imageonline, continuous monitoring of LPG leakage or LEL level, wall or duct mount, with / without display & relays, ATEX certified with safety integrity level SIL 2, explosion proof for Zone 1, 2

Model: S2XX7

LPG detector - analog LEL sensor transmitter with ATEX, SIL 2 for Zone 1, 2
LPG detector – analog LEL sensor transmitter with ATEX, SIL 2 for Zone 1, 2

LPG gas detector, SMART S series is highly robust, industrial grade, flameproof or explosion proof gas detector for LPG leakage detection or LEL monitoring. It is used for online, continuous monitoring of LPG flammable concentration in %LEL or %Vol 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 10-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
  • 10-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 HW TUV certified
  • 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
LPG gas detector - LEL monitoring in Zone 1, 2 hazardous area - ATEX, SIL 2
LPG gas detector – LEL monitoring in Zone 1, 2 hazardous area – ATEX, SIL 2

Technical Specifications:

  • Measuring Parameters: LPG leakage, LPG LEL level / flammability
  • Sensor Technology: Catalytic bead based pellistor sensor cell
  • Measuring range: 0 ~ 100 % LEL
  • Response time (t90): < 30 sec
  • Control unit: 10 bit microprocessor based
  • Warm up time: < 5 mins
  • Auto zero point tracking for drift compensation
  • Power supply: 24 VDC
  • Ingress protection: IP65
  • 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


  • Kitchen, Canteen area
  • LPG reticulation system – residential, apartments, hotels, restaurants
  • LPG gas banks, warehouse
  • Bottling plants
  • Hotels, barbeque
  • Food processing units, bakery – heated conveyor belts
  • Oil & gas fields