H₂S Analysers

  • Measurement specific to H₂S
    No interference from other components
  • Measurement range
    Fully configurable between 0-50ppb to 0-100%
  • Single point calibration
    Low operational costs No Zero drift
  • Auto Validation system
    Onboard calibration system management
  • Integrated dilution software
    Low cost & improved efficiency
  • Multi-streaming capability
    Will control up to 4 streams simultaneously
  • Optional On-board Webserver
    Complete open communication.
  • On-board Data logging & Diag. Functions
    Complete storage capabilities.
  • Modbus TCP/RS485
    Open communication protocols
  • Density compensation (ppm/w) (option)
    4-20 mA Real-Time density compensated
  • Dual-Range software (option)
    Dual ranges possibilities

With its wide-ranging ability to measure H₂S from % levels down to ppb levels, the HG500 range of H₂S pro-cess analyzers can be utilized in many process industries, including:
– Natural gas pipelines
– Reformer recycle gas
– Gas processing
– Offshore gas production
– Fuel gas monitoring
– Biogas

A reel of paper tape impregnated with lead acetate is exposed to the gaseous process sample in the sample chamber. Hydrogen sulfide (H₂S) in the process sample reacts with the lead acetate, after humidification, to form lead sulfide (PbS), a brown compound that stains the tape. The higher the concentration of H₂S is the faster the darkness of the stain is. A bi-directional fiber optic measures the darkening stain and the analyzer computes the concentration of H₂S.
Incremental measurements are made on the same spot until saturation occurs when the tape is advanced to a fresh portion of the tape. This avoids the need for frequent zero or span calibrations.

Measurement principleColorimetric (complies with ASTM D4045, D4084, D4323, D4468)
Typical ranges0-100 ppb/v, 0-1 ppm/v, 0-50 ppm/v, 0-1% Other ranges on request
KeypadAccessible through flameproof box using Touchsense™ technology
Repeatability± 1% full scale
Accuracy± 1% full scale
DriftNo zero drift
Output1 x 4-20mA per detection module; Modbus TCP/IP and RS485
Alarms1 x measurement alarm, 1 x instrument failure alarm. Other alarms available
Area classificationIECEx / ATEX approved, Ex d [ia] IIC T6
Ambient temperature limits-20°C to +55°C
Tape lifeUp to 90 days depending on the application.
Weather protectionIP66
Response time Auto validationDepends on the application but typically 10sec Optional
Power85 / 250 VAC 50 / 60 Hz, 40 VA
Process sampleMini/Max pressure 0.5 – 4.0 barg,  Mini/Max flow rate 100 to 300 cc/min , Mini/Max  0°C – 80°C temp
Nitrogen or Inst. AirDry, pressure 3.0 – 10.0 BarG, flow 100 to 500 cc/min (models 502 & 503), optional for model 501
Detection box purgeOptional – 2 L/min (typical)
Process connections⅛” OD inlet, ¼” NPT female vent (to atmospheric vent)
Analyzer VentTo the atmosphere, no back pressure or vacuum allowed
SizeWeight 35 Kg approx., dimensions 378(w), 975(h), 235(d) mm

Total Sulphur
Density, Moisture, Temperature, Flow

Model 501 for low range (up to 80ppm)
Model 502 for mid-range (80 – 1000ppm)
Model 503 for high range (1000ppm – 100%)

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