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Used in our SERVOPRO Chroma gas analyzer, the Thermal Conductivity Detector (TCD) works alongside Gas Chromatography (GC) techniques to deliver robust, accurate measurements for binary gas mixtures in industrial and medical gas applications.
The TCD consists of an electrically heated Wheatstone bridge in a temperature-controlled cell.
For GC-TCD applications, the carrier gas (helium) is passed over the reference arm of the bridge and the column effluent passes over the analyte arm under the same conditions for flow rate and temperature.
When no impurities are eluting from the column, the heat loss from the analyte arm matches that from the reference arm. When an analyte elutes from the column, it affects the thermal conductivity, changing the electrical resistance, which is measured as a signal.
Thermal Conductivity is a robust technique for determining the concentrations of gases in a binary mixture. The Thermal Conductivity detector is a universal sensor.
Analytical methods involving a TCD can be used where the constituents of the binary gas are known, such as in GC-TCD.
Thermal Conductivity works with Gas Chromatography to deliver measurements down to ppb levels for industrial and medical gases. TCD sensing has a relatively low sensitivity to changes in flow rates, which requires larger sample sizes. Additionally, more cost-effective solutions may be available for some applications.
Medical gases
Air separation units
Specialty gases
A robust method for binary mixture analysis
Universal detector for Gas Chromatography analysis
Measures from very low concentrations up to percentage levels
Binary gas mixture measurements, for medical and industrial gases.
Learn more about all our gas analyzer solutions that use this sensor technology.
The Chroma is optimized to specific background gases to ensure optimum performance for your application.
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If you still need guidance to find the best solution for your process, we’re here to help. Our expert team combines applications knowledge with extensive experience and deep understanding of the sensing technologies available. We’ll help you find the solution that meets your unique needs.