Technical Specifications
- Detection limits:
- H2S/TOS TS MEDOR® ppb: 5 ppb H2S (7 μg/m3)
- H2S/TOS TS MEDOR® ppm: 0.1 ppm H2S (0.1417 mg/m3)
- Detection range: H2S / TOS / TS
- 0/10, 0/100 or 0/1000 (ppb or ppm)
- Low % with HC sampling valve
- Relative Standard Deviation:
- RSD < 3% on concentration over 48H.
- RSD < 0.6% on retention time over 48H.
- Results:
- Hardware storage
- MODBUS communication protocol (optional)
- 4-20mA (optional)
- Linearity:
- 0.995 for all compounds
- Cycle time:
- H2S / TS result in 2 min for 0-3 ppm range
- H2S / TS result in 5 min for higher range
- Gas supply:
- Carrier: Dry air or N2 (3 bars): 5 ml/min.
- CALIB: in continuous 50 ml/min. (option)
- CALIB during validation ~ 250ml/min (option)
- Pneumatic valve 90ml/commutation
H2S, total organic sulfur and total sulfur
The H2S/TOS TS MEDOR® is an autoGC-ED (MEDOR® Electrochemical wet cell Detector) for the analysis and monitoring of H2S, TOS and TS.
- Different configurations exist depending on the application and concentration range : HS2/TOS TS MEDOR ppb for 0-1 ppm and H2S/TOS TS MEDOR ppm for 0-10 / 0-50 / 0-100 ppm
Principle
- Automatic sampling using a loop
- Automatic loop injection on metallic capillary column
- Isothermal gas chromatograph
- Detection of all compounds eluting from the column performed by MEDOR® detector : Electrochemical wet cell Detector which is a Sulfur Specific Detector (SSD)
- Signal provided by electrochemical reaction between the wet cell electrolyte and the sulfur compounds
- Fully compliant with ASTM D 7493-14 : Standard Test Method for On-line Measurement of Sulfur Compounds in Natural Gas and Gaseous Fuelsby Gas Chromatograph and Electrochemical Detection.
- Compliant with ASTM D 5504-20 : Standard Test Method for Determination of Sulfur Compounds in Natural Gas and Gaseous Fuels by Gas Chromatography and Chemiluminescence with alternative detector.
Key points
- Continuous monitoring with automatic online sampling
- Analytical performances :
– Specific, linear and very sensitive to sulfur compounds
– Results validation by automatic standard injection
– Long term stability using detector installed in reservoir - Extremely low maintenance :
– Very long life time detector with electrolyte, up to 10 years.
– Low gas consumption, can be reduced in option
– More than 10 years data storage
– No cylinders required thanks to internal calibration tube and gas generators - Automatic control with process device
- Intelligents system with tunable and interactive alarm levels
- Powerful VISTACHROM Chromatotec® software :
– Remote monitoring & injection control
– Full traceability with on board archiving of results and chromatograms
