As a leading manufacturer and supplier of Thermal Conductivity Detectors (TCDs) worldwide, AGC Instruments is able to advise and design a suitable configuration should it not be standard.
The Thermal Conductivity Detector (TCD) is simple in construction, inexpensive yet rugged, universal, has excellent sensitivity and is relatively linear through a wide range. In its use, the sample is not destructed. It is one of the most widely used detectors in the world today.
The Thermal Conductivity Detector (TCD) comprises of a metallic block which contains a cavity through which gas flows. Positioned in this gas flow are heated elements (Hot Wire Filaments or Thermistors). As each gas has a known thermal conductivity, the method of difference in these thermal conductivities is the principal upon which it is based. For this method, two heated elements in two cavities are required. In Chromatography applications, the carrier gas passes through one cavity and the sample after being passed through the column flows through the second cavity. For Process applications a Reference (or Span) Gas and Sample Gas are used.
http://www.agc-instruments.com/thermal-conductivity-detectors-tcd
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