Assuring Single-Phase Vapor Sample for Gas Chromatograph

by , | Dec 3, 2019 | Downstream Hydrocarbons, Industry, Measurement Instrumentation


Gas chromatographs analyze the composition of hydrocarbon mixtures in process and natural gas applications. For online natural gas chromatography, the samples must be reliably conditioned to produce a single-phase vapor.

In this 5:42 YouTube video, How to Select a Vaporizing Regulator for Your Sampling, Emerson’s Laura Schafer explains how the TESCOM 44-6800 Vaporizing Regulator helps refiners and petrochemical producers to solve challenges such as inaccurate analytical results caused by gas sampling and conditioning issues. These inaccuracies can lead to wasted time and money for these producers.

The vaporizing regulator must add enough heat to assure a single-phase vapor state gas sample. In addition to measurement inaccuracies, heavier hydrocarbon liquids can contaminate the gas chromatograph.

Beyond maximizing the surface area to transfer heat to create the single-phase vapor state, the TESCOM 44-6800 vaporizing regulator includes a PID [proportional-integral-derivative] controller to accurately control the temperature based on the processing requirements from 50-400 degC.

This innovation replaces the lengthy wattage and source sample temperature variation calculations traditionally required in order to provide enough heat to assure a single-phase vapor sample. Closed-loop temperature control eliminates the need for these efforts.

Laura describes how the sampling cabinets are often heated and sometimes the required heat exceeds the transmitter specifications. With this Tescom regulator design, the transmitter and regulator can be separated where the temperature transmitter is housed outside the enclosure enabling great cabinet design flexibility and size reduction.

From a safety standpoint, a secondary thermal cutoff has been added to the regulator to shut off power to the vaporizing regulator in a thermal event.

Check out this video and visit the TESCOM 44-6800 Series Vaporizing Regulator page on for more on this innovative technology.

You can also connect and interact with other process and gas chromatograph experts in the Measurement Instrumentation group in the Emerson Exchange 365 community.

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