Laser Based Open Path Gas Detection for H2S or CO2 – GD1



The Simtronics GD1 sets a new standard for toxic gas detection. Using a tuneable laser diaode the GD1 delivers enchanced coverage and fail safe detection. The performance improvement marks a genuine step change for safely systems and life cylce cost savings

  • Optical infrared toxic gas detection
  • Tuneable laser diode / laser scanning
  • No undisclosed source of failure
  • Large area of coverage
  • High sensitivity
  • Fast acting
  • Vibration and misalignment tolerant optics
  • Heated optics, transmitter and receiver
  • Optional Methane detection output
  • HART®
  • No sensor recalibration or replacement
  • Superior detector stability and specific
  • Suitable for use in SIL2 system
  • Fewer devices cover the same risk
  • Suitable for personnel safety purposes
  • Fastest possible speed of response
  • High performance in arduous conditions
  • Reduced cabling and maintenance costs
  • Non-proprietary user interface and improved preventive maintenance

The GD1 has been designed with features that provide an effective response to the detection of gas hazards in a wide range of industrial environments from offshore production facilities to wastewater treatment plants.

At the heart of the detector is a tuneable laser diode that eliminates environmental effects from sun, rain and fog. The laser scans single absorption lines where there is no interference from other gases.

The complete optomechanical design and construction is so stable that an ultra fast speed of response can be achieved whilst providing unparalleled service life and detector stability, thus saving on maintenance and service costs.

Supplied with worldwide hazardous area approvals. Suitable for use in systems with SIL 2 requirement.

Technical Details
Detection Method Near IR laser scanning
IR-Source Tune-able laser diode / Laser Class 1, eye safe
Detector Variants H2S; CO2; h2S and CH4 (Dual Output) others available on request
H2S 0 – 200 ppm.m (Option 0 – 1,000 ppm.m)
CH4 Methane 5 LEL.m (Option 1 LEL.m)
Path Lengths 5 – 50 m / 5 – 100 m
Self Test Continuous
Calibration Factory set, no field recalibration
Lifetime Stability Zero: ±2% of Full scale deflection / Span: ±3% of Full scale deflection
Response Time T90 < 5 sec.
Alignment ±0.5° (5 – 50m)
Optics Heated (Transmitter and Receiver)
Obscuration >90%
Output Signal
Standard 4-20mA sink or source, max. load impedance 500Ω HART®
Option RS485 / Modbus protocol
Fault Signal Beam block / fault:  1mA
Low signal:  2mA
Warning:  3mA
Power Supply 24 VDC, range 18-32 VDC
Power Consumption <10W
Cable Entry 3 x M20 per junction box
Temperature Range
Storage -40°C to +70°C (-40°F to +158°F)
Operating -40°C to 65°C (-40°F to +158°F)
ATEX Flameproof -55°C to 75°C (-67°F to +167°F)
Humidity (Operation) 100% RH
Tx and Rx Housing Stainless steel SIS2343 (ASTM 316)
Junction Box GRP
Weight Approx. 5.5 kg (12 lbs) per Tx or Rx /
Approx. 2.0 kg (4.4 lbs) per Tx or Rx Junction Box
Dimension 205L x 115W x 248H (mm) / 8.1 x 4.3 x 9.8 (inches)
Warranty 5 Years full warranty on detector system
ATEX II 2 G EEx ia m e T6
CSA Class 1, Div, Groups B, C & D (Pending)
Ingress IP66 / IP67 DIN 40050
SIL Suitable for use in SIL2 systems
Note: Specification are subject to change without notice.

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