Delphian Corporation TC Sensor 201B

Delphian makes two types of sensors for combustible hydrocarbon detection: the model 201G, catalytic combustion type sensor, and the model 201B thermal conductivity type sensor. All sensors are temsted for span in methane and offset in air only to make sure they meet controlled performance standards and to guarantee consistency. These sensors are direct replacements for the CC and TC sensors made by J.W. (Bacharach Instrument Co.) and Analytical Logging. Delphian's sensors offer several improvements over other hot wire sensors. A new header design reduces sensor damage from rig vibrations. Aluminum tubes replace conventional glass tubes to isolate the filaments and reduce breakage. Special care is taken to assure that the welds which attach the sensing coils to the headers are always made for optimum strength. New materials and a self-fixturing design ensure more precise header and tube alignment. These features assure a longer life and a more consistent performance. Both sensors may be used ina wide variety of electrical circuit configurations and flow cells to suit the user's requirements. Delphian tests sensors in a standard J.W. Flow cell using the circuit shown in Figure 2.