- Measurement specific to H₂S
No interference from other components - Wide range capability
Measures between 0-50ppb to 0-600ppm - Low volume humidifier
Response times as low as 10 seconds - Electronics temperature compensated
Improves stability - No instrument air / N₂ required
Lowers running costs - Fibre optic link between housings
Reduces effects caused by ambient temperature swings - Up to 4 detection modules per controller
Minimizes capital investment - Multi-streaming capability
Will control up to 4 streams with one controller
APPLICATIONS:
With its wide-ranging ability to measure H₂S from % levels down to ppb levels, the HG100 range of H₂S process analyzers can be utilised in many process industries, including:
– Natural Gas pipelines
– Reformer recycle gas
– Offshore gas production
– Fuel gas monitoring
– Biogas
– Sour gas treatment plants
PRINCIPLE OF OPERATION
A reel of paper tape impregnated with lead acetate is exposed to the gaseous process sample in the sample chamber. Hydrogen sulphide (H₂S) in the process sample reacts with the lead acetate, after acidification, to form lead sulphide (PbS), a brown compound that stains the tape. The higher the concentration of H₂S the darker the stain. A focused LED and single photodetector system continuously measures the darkening stain and the analyser reports this as a 4-20mA output of 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) |
| Software | C++ Windows XPe based, SIL 2 certified |
| Electronics | PC104, Intel Celeron 400MHZ microprocessor, 256Mb SDRAM, 512Mb compact flash for the operating system, application, customised parameters and calibration curves storage |
| Keypad | Accessible through flameproof box using Touchsense™ technology |
| Measurement range | Between 0-50ppb H₂S to 0-600ppm H₂S |
| Repeatability | ± 1.5% full scale |
| Drift | Zero |
| Multiplexing | Up to 4 detection modules on one controller |
| Output | 1 x 4-20mA per module (Modbus optional) |
| Alarms | 1 x measurement alarm, 1 x instrument failure alarm. Additional optional alarms available |
| Area classification | General Purpose |
| Ambient temperature limits | -20°C to +40°C |
| Tape life | Up to 60 days depending on application. |
| Weather protection | IP66 |
| Response time | Depends on application but typically 10secs for 0-10ppm range |
| UTILITIES | |
| Power | 120 / 240 VAC 50 / 60 Hz |
| Power rating | 40 VA |
| Process sample | Max pressure 1.5 – 4.0 bar, flow rate 0.15 to 0.3 l/min , 40°C max temp |
| INSTALLATION | |
| Process connections | ⅛” OD inlet, ¼” NPT female vent (to atmospheric vent) |
| Analyser Vent | To Atmospheric, no back pressure or vacuum allowed |
| Weight | 30 Kg approx |
| Dimensions | 378(w), 975(h), 235(d) mm |
| ORDERING INFORMATION: | |
| Application Range Process conditions Wall mounting or free-standing frame Power supply |