- Descripción detallada
Monitoring of Odorants in Natural Gas
The gas odour level of natural gas needs to be monitored at regular intervals to secure the required level of the organosulphur compounds tetra-hydro-thiophene (THT) and tert-butyl-mercaptane (TBM) or the sulfur-free (Gasodor-S-Free) markers, which are used worldwide to odorize natural gas. The safety concern is to assure a minimum concentration of the alarming smell while not overdosing the high-priced odour markers.
With experience of more than 10 years in the natural gas application G.A.S. in 2015 launched a new customized instrument generation. Compared to former products the GC-IMS-ODOR based on gas chromatography, which enables an excellent separation of any natural gas matrix and to measure any odorant with an accuracy of better than +/- 1 mg/m3. Moreover, the configuration, workflow and particularly its user-interface optimized to correspond to the daily routines and operations of utility personnel in the field.
The GC-IMS-ODOR is versatile as its 19" housing allows a portable on-site use with an automatic pressure independent flow adjustment, one-klick operation and a measurement time of 4 minutes. Results are stored on the compact flash card, can be linked to locations and later being downloaded using a USB stick to be printed as report or converted to Excell tables.
The GC-IMS-ODOR can operated alternatively as on-line monitoring device where it samples and fully automatic re-calibrates itself at user-defined intervals. Data can transferred via Ethernet or 4-20mA output to a control room. Using this operation mode and positioning the instrument at critical 'end-points' of its grid the utility assures a 24/7 control of its odour concentration and can react immediately in case of a problem at the point of odorization, the grid or an empty odorant container.
Therefore, the GC-IMS-ODOR represents a rugged, value for money high-end equipment that can still operate by the technical personnel of natural gas utility.
Working Principle: Gas Chromatograph-lon Mobility Spectrometer.
GC-Column: Capillary Column 30 m.
Detector Source:Tritium 300MBq,below the exemption limit for a license according to EURATOM Directive 96/26.
Sampling: Heated 6-port-valve.
Measurement Range: Gasodor S-Free: 4.0-40 mg/m3 (Resolution 0.1), THT: 4.0 - 40mg/m3 (Resolution 0.1), TBM: 0.1 - 1O mg/m3 (Resolution 0.1)
Calibration Gas: Gasodor®S-Free, THT and TBM in natural gas or nitrogen.
Display: 6.4" TFT touchscreen display
Data Acquisition: Ultra-fast ADIO-Board
Data Processing: 1.6 GHz lntel Atom
Data Storage: 4GB (or bigger) compact flash card
lnterfaces: RS232, USB, Ethernet, 4-20 mA current loop
Pressure Range: 1.0 kPa - 400.0 kPa (1O mbar- 4 bar)
Power Supply: 100- 240 V AC, 50-60 Hz (external)
24 V DC/ 5A, XLR connector (internal)
Operating Temperature: -10ᵒC - +40ᵒC
Dimensions: 449 x 435 x 177 mm (WxDxH)
Weight: 15.5 kg
Housing: 19", IP 20 enclosure, EMC conformity
Cooling: Axial fan, speed control temperature related (max 5.5 m3/h)
Gas Connectors: 3 mm stainless steel (Swagelok) for drift gas inlet, sample gas inlet and outlet, carrier gas inlet and IMS gas outlet.