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NovaSulf - Model HL400 Series -Process H2S Analyser System
Duty: To measure the concentration of H2S in a process liquid stream, including the measurement of H2S in crude oil. The principle of operation is as follows. The Analyser consists of a stripping system coupled with a NovaSulf H2S Analyser. The liquid sample enters the top of an insulated, heated sample handling cabinet via a flow controller to maintain a constant sample flow. Nitrogen flows down a vertical tube to a sintered plug located within the liquid and then flows up through the liquid. As the nitrogen mixes with the liquid hydrocarbons it strips out the dissolved H2S in the liquid.
The degassed liquid falls into a reservoir and then to the drain. At the same time, the nitrogen containing H2S in proportion to that in the original liquid is piped directly to the NovaSulfTM HG 400 series H2S Analyser to be measured.
The benefits of this technology can be summarised as follows:
- As the measurement is specific to H2S, there will be no interference from other sulphur components
- A continuous analyser, not cyclic
- The instrument has a wide range capability, measuring between 0-2ppm to 0-1% H2S
- Configuration of the system is via a touch screen which eliminates the need to open the enclosure.
- Single point calibration results in lower running costs
- A compact flash card allows for remote evaluation and diagnostics
- Capital investment is minimised as up to four detection modules can be run from one controller
- Suitable for gas group IIC environments.
- With its wide-ranging ability to measure H2S from % levels down to ppb levels, the HG400 range of H2S process analysers can be utilised in many process industries, including the measurement of dissolved H2S in crude oil.
ANALYSER:
- Measurement principle : Dissolved H2S in liquids is stripped out with a nitrogen carrier gas and measured made using colorimetric techniques
- Software : C++ Windows XPe based
- Measurement range : Between 0-2 ppm H2S to 0-1% H2S
- Repeatability : ± 3% full scale
- Response time: 60 to 300 seconds application dependent
- Output : 4-20mA
- Modbus optional
- Alarms
- 1 x measurement alarm
- 1 x instrument failure alarm
- Optional low flow alarm
- Optional paper break/motor failure alarm
- Area classification : ATEX approved, Ex d [ia] IIC T4
- Ambient temperature : -20°C to +40°C
- Tape life : Up to 60 days depending on application.
- Weather protection : IP66
UTILITIES
- Power: 120 / 240 VAC 50 / 60 Hz, 49VA
- Sample:
- Pressure 1.5 to 4.0 barg
- Flow 0.15 to 0.3 l/min
- Temperature 40°C max
- Viscosity
- Nitrogen: 4-10 bar, flow 0.5 to 1.0 l/min
INSTALLATION
- Process connections: ¼” NPT female vent, ½” NPT to atmospheric drain
- Analyser vent : To Atmospheric, no back pressure
- Weight : 50 Kg
- Dimensions : 800(w), 1700(h), 350(d) mm