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
APPLICATIONS:
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
PRINCIPLE OF OPERATION
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.
| SPECIFICATIONS ANALYSER: | |
| Measurement principle | Colorimetric (complies with ASTM D4045, D4084, D4323, D4468) |
| Typical ranges | 0-100 ppb/v, 0-1 ppm/v, 0-50 ppm/v, 0-1% Other ranges on request |
| Keypad | Accessible through flameproof box using Touchsense™ technology |
| Repeatability | ± 1% full scale |
| Accuracy | ± 1% full scale |
| Drift | No zero drift |
| Output | 1 x 4-20mA per detection module; Modbus TCP/IP and RS485 |
| Alarms | 1 x measurement alarm, 1 x instrument failure alarm. Other alarms available |
| Area classification | IECEx / ATEX approved, Ex d [ia] IIC T6 |
| Ambient temperature limits | -20°C to +55°C |
| Tape life | Up to 90 days depending on the application. |
| Weather protection | IP66 |
| Response time Auto validation | Depends on the application but typically 10sec Optional |
| UTILITIES | |
| Power | 85 / 250 VAC 50 / 60 Hz, 40 VA |
| Process sample | Mini/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. Air | Dry, pressure 3.0 – 10.0 BarG, flow 100 to 500 cc/min (models 502 & 503), optional for model 501 |
| Detection box purge | Optional – 2 L/min (typical) |
| INSTALLATION | |
| Process connections | ⅛” OD inlet, ¼” NPT female vent (to atmospheric vent) |
| Analyzer Vent | To the atmosphere, no back pressure or vacuum allowed |
| Size | Weight 35 Kg approx., dimensions 378(w), 975(h), 235(d) mm |
Options:
Total Sulphur
Density, Moisture, Temperature, Flow
MODELS:
Model 501 for low range (up to 80ppm)
Model 502 for mid-range (80 – 1000ppm)
Model 503 for high range (1000ppm – 100%)