The FTC200-OEM is a highly precise and stable Thermal Conductivity Detector (TCD). It is designed for the use as an OEM detector. Since it is not equipped with housing it has protection class 00 and no electro-magnetic shielding. It is not designed for the use in hazardous areas.

For indication of the signal a 0 to 10V analog output is provided. For internal calibration, configuration and digital indication of the signal a TTL-level RS232 communication is required. For testing purposes we offer a RS232 to TTL level converter as well as two small windows programs for a PC in order for perform offset and gain calibration.

The thermal conductivity of a gas mixture depends on the individual gas components and on the composition of the mixture. Under certain conditions the concentration of individual gas components can be determined by measuring the thermal conductivity. In other cases the identification of certain properties of gases is of special interest e.g. for quality control or safety reasons. Often these properties are related to the thermal conductivity and thereby identified. The concentration can be determined with high precision if one of the following conditions is met:

• ♦  The gas mixture consists of only two components, for example measuring CO₂ in N₂ or H₂ in N₂.
• ♦  The gas mixture consists of more than two components but only concentrations of two components vary.
• ♦  The thermal conductivity of two of three constituents is similar, e.g. measuring H₂ or He or CO₂ in a mixture of O₂ and N₂.
• ♦  In case, a cross sensitive gas may be measured separately and the signal of this measurement is fed into FTC200 where an internal routine compensates the cross sensitivity.