Gas Chromatography is an instrumental method used
for the separation and identification of chemical
compounds and gases. This is done by introducing
a gas sample into a heated injector and then carried
through a separating column by an inert gas (Helium),
and then pushed passed a Thermal Conductivity Sensor
(TCD). The TCD sensor uses a wheatstone bridge
circuit that works by using a pure carrier air
(Helium) flowing past one sensor and a sample gas
flowing across another sensor. Every component
of gas moves through the column at a different
rate. The difference in thermal conductivity is
measured and amplified by the electronics and then
in turn converted into a digital value. This digital
value is then given to the instrument's computer
software which creates the gas chromatogram curve.
The software then uses programmed windows (Time
Slots) and calculates the area that resides in
these time slots. The area is then multiplied by
a pre-determined calibration factor, which in turn
gives you a digital readout of each curve in %
or ppm. The MTI and Varian are the two models of
high speed chromatographs that Continental Laboratories
Ltd. currently uses for their Complete and Limited
Some of the features of the MTI and Varian chromatographs
- Completely portable and compact.
- Computer generated output and
break down of each gas in percent (%) or ppm
(parts per million).
- Gases measured are Methane (c1),
Ethane (c2), Propane (c3), Butane (iso / normal)
(c4), Pentane (iso / normal) (c5), Hexanes
(c6), Heptanes (c7), Octanes (c8), Carbon Dioxide
(co2) and Nitrogen (n2).
- Gas Sampling Times are 30, 60
or 120 seconds.
- WITS compatible.
- Data storage of complete well.
- Integrated with Continental Laboratories
Ltd. Total Gas Detector.
- Can be set up to calculate
Oil, Wetness and Balance ratios.