Teledyne 2750 - Portable turbine generator gas analzyer - Manual (Page 12)

Introduction Model 2750
Teledyne Analytical Instruments 12
The thermal conductivity sensor senses the thermal conductivity
(T/C) or heat transfer rate of the sampled gas mixture and produces an
electrical signal proportional to its heat conductivity. The T/C of the two
gases in the mixture are significantly different. Because of this
difference, the T/C of the gas mixture will be proportional to the
percentage of each gas in the mixture. The resulting raw signal from the
sensor is linearized and ultimately converted into a concentration
readout on the digital display. Although it is possible to obtain a digital
readout using almost any binary mixture of gases with a reasonable
thermal conductivity difference, this instrument is designed and
internally calibrated for only those gases and analysis ranges listed
above. Any other mixture will produce erroneous results. Contact the
factory if your application requires an analysis range not listed above.
1.3 Enclosure
The Model 2750 is a portable instrument housed in a rugged impact
resistant NEMA 4X polyethylene enclosure which can easily be set up at
the point of analysis and field-calibrated. The top of the case opens to
reveal the operator interface panel. The analysis section is located in the
cover section of the enclosure. See Figure 1-1.
Figure 1-1: Front View of the Model 2750