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The GC-IMS-ODOR is a stand-alone instrument, which has developed to quantify precisely the concentration of Gasodor-S-Free, THT or TBM in natural gas.

Besides, power the GC-IMS-ODOR only needs N2 or synthetic air as drift and carrier gas for operation. Driving from spot to spot its one-klick operation accessible via the 6,4“ TFT touch screen display allows to securely carry out on-site tests manually even by non-specialists. Upon completion of a measurement after approx. 4 minutes, values are automatically stored on the integrated compact flash card. They can downloaded via USB stick or Ethernet cable connection to PC at the end of a shift. Reports are available as user-friendly Excel tables or directly printable from pdf.files.

Alternatively, the device can used as a 24/7 based on-line monitoring tool to automatically test for the odour concentration in user-defined intervals. Operating in this mode the system carries out a self-test before each test and if necessary re-calibrates itself by the use of a calibration gas so that maximum accuracy and security achieved. Acquired data consecutively transmitted via current loop 4-20mA, a modem- or network connection to a control room. 

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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.

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