AGC Instruments 20 Binary Stream Gas Analyser

The 20 Binary Stream Gas Analyser

The 20 Series Thermal Conductivity gas analyser was developed for the determination of binary gas mixtures and gas purity measurements. This analyser compares the difference in the thermal conductivity between the sample and reference gases, which are exposed to the detector elements.

Thermal Conductivity Detector:
The TCD consists of a block (usually metallic) containing a cavity through which the gas flows. Four sensing elements which are connected to form an electrical Wheatstone bridge circuit. These elements are miniature Rhenium- Tungsten filaments, which are mounted in a metallic cell block. A diffusion type thermal conductivity cell is used in this analyser. This cell contains a sample and reference gas flow geometry. Two filaments are installed in each flow system. An electrical current from a DC power source heats the elements.

To balance the instrument, the reference gas must be passed through both the sample and reference flow systems.
When a sample gas of different composition is introduced into the sample system, a change in the rate of heat loss will occur. This change will cause the element resistance to change, causing the Wheatstone bridge to unbalance. The output represents the concentration of the sample gas being analysed and displayed directly on the digital meter.

Other Features:
For High Purity Gas Analysis, Stainless Steel fittings and tubing is used throughout. For corrosion resistance systems, all wetted surface parts will be manufactured in corrosion resistant materials such as Nickel or Monel. The Display used will indicate in % or ppm of the measured component. With features such as 4-20mA, Hi-Low Alarms, RS232 or RS 485 available, the 20 Series will display and transmit all the relevant information to ensure monitoring of the process is accurate and continuous. This versatile Gas Analyser can be provided in an IP55 or an Ex”p” enclosure for Zone 0 and Zone 1 operation. Please contact AGC Instruments for
more information.