Part Number: 67-9091-EX

S-Guard Ex

Built to combine intelligence and reliability the S-Guard Ex delivers hydrocarbon gas detection with a clear display and comprehensive communications.

List of Benefits

  • Continuous detection of combustible gas in explosion hazardous area with flame proof structure
  • Self diagnosis function with built-in Microprocessor
  • Excellent selectivity by adapting detection principle only for oxygen & toxic gas
  • Superior performance for detecting gas below TLV
  • Multi functions and high quality with low cost of ownership
  • Built-in Back light LCD display
  • Auto calibration and program setting with magnet bar and LCD display
  • 4-20mA DC output signal
  • One man Calibration and maintenance


GasTech Australia Smart Guard series S-GuardTM Series GTD-2000Ex hydrocarbon Gas detector is a catalytic smart  transmitter. The sensing and reference elements are self-compensating for temperature integrity. The industry standard 4 -20 mA analog output provides remote alarm, fault and calibration signals.


  • Refineries
  • Gas turbines
  • Drilling and production platforms
  • Chemical plants
  • Fuel loading facilities
  • Compressor stations
  • Oil well logging
  • Wastewater treatment facilities
  • LNG/LPG processing and
  • storage facilities
  • Transportation facilities

Available Models/ Parts

  • 67-9091-EX : S-Guard Ex Catalytic Smart Transmitter and JBox 0-100% LEL IECex
SpecificationDetail Description
ModelS-Guard Ex GTD-2000 (Hydrocarbon)
Measuring gasCombustible gas (LNG, LPG, Methane & etc)
Measuring typeDiffusion type
Sensor typeHot wire semiconductor cell, Catalytic cell, Thermal conductivity cell semiconductor cell
Measuring range0-2,000 ppm & 0-100 % LEL, 0-10,000 ppm & 0-5.0% Vol
Response time<15 sec / 90% scale
Accuracy±3% / Full scale
Parameter controlsNon intrusive control with Magnet bar (calibration, maintenance, alarm setting)
Measuring value displayLCD display (Built-in Back light 2-Line, 16 characters)
Output signal
Analog output Measuring signal
Maintenance signal3 mA DC
Calibration signal2 mA DC
Fault signal0 mA DC
Digital outputRS-485 MODBUS (Option)
Cable / DistancePower + signal cable
RS-485 data communication cable 1par (UL2919 RS-485) / 1,000m max.
Conduit pipe1/2" & 3/4" PF, NPT (3/4" PF standard)
Mounting type 2" Pole mount, Wall mount, Duct mount
Operating temperature-20℃ ~ +60℃
Operating humidity5 ~ 99%.RH (non-condensing)
Operating supply voltage18 ~ 31V DC (24V DC normal) / 300mA max.
Dimensions136 x 166 x 110 (W X H X D)mm
ApprovalFlame proof (Ex d IIC T6),ATEX, IECEx

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