Part Number: 67-9091-xxx (xxx refers to gas required)

S-Guard Tx

The Gastech GTD-2000Tx is part of the S-Guard TM smart transmitter series and includes instruments for both toxic gas detection and oxygen concentration monitoring. The sensing element technology provides long operational life, low cross sensitivity and robust environmental performance.

List of Benefits

  • Flameproof cast Aluminium enclosure.
  • IP66 Ingress Protection rating.
  • Smart microprocessor based architecture.
  • Continuous monitoring of toxic gases and oxygen in explosive gas hazardous area applications.
  • Industry standard 4 - 20mA output signal.
  • Inbuilt self-diagnostics continually monitor detector status giving increased operational confidence.
  • Low cross-sensitivity sensor technology gives excellent target gas selectivity.
  • Performance optimised for detection below TLV.
  • Clear back-lit LCD for display of measurment and status information in all visibility conditions.
  • User-configfurable to provide flexible integration into end applications.
  • Auto calibration functionality.
  • "No-Access" calibration and configuration using magnet stylus.
  • High reliability operation giving low cost of ownership



  • 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

Ordering Information

  • 67-9091-H2S : S-Guard H2S Transmitter and JBox 0-50ppm IECex
  • 67-9091-xxx  :  (xxx) represents the gas type eg HCN, CO etc
The instruments transmit industry standard 4 - 20 mA analog output, providing gas concentration, fault and calibration signals. Modb us digital communications transmitted via RS485 and HART communication via the 4-20mA output are also available as an option.
SpecificationDetail Description
Model S-Guard Cat GTD-2000 (Hydrocarbon)
Measuring gas Refer to Gas Table
Measuring type Natural Diffusion
Sensor type Electro-Chemical or Galvanic Cell
Measuring range Refer to Gas Table
Response time 45 seconds to T90
Accuracy ±3% / Full scale
Parameter controls Non intrusive control with Magnet bar (calibration, maintenance, alarm setting)
Measuring value display LCD display (Built-in Back light 2-Line, 16 characters)
Output signal
Analog output Measuring signal
Maintenance signal3 mA DC
Calibration signal 3 mA DC
Fault signal 2 mA DC
Digital output MODBUS RTU. Half Duplex RS485 (optional), HART Interface (optional)
Cable / DistancePower + signal cable
RS-485 data communication cableSingle twisted pair (UL2919 RS-485) / 1,000m max
Conduit pipe1/2" & 3/4" PF, NPT (3/4" PF standard)
Mounting type2" Pole mount, Wall mount, Duct mount
Operating temperature-20℃ ~ +60℃
Operating humidity5 ~ 99%.RH (non-condensing)
Operating voltage range18 ~ 31V DC (24V DC normal)
Maximum operating current300mA
Dimensions136 x 166 x 110 (W X H X D)mm
ApprovalFlameproof structure (Ex d IIC T6),ATEX, IECEx GTL-100 (Explosion-proof Warning Light) Rain Cover

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