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Optional Hardware and Software Model GFC7001E Carbon Dioxide Analyzer
Teledyne Analytical Instruments 79
Figure 5-17: GFC 7001E/EM – Internal Pneumatics with CO
2
Sensor Option 66
5.9.2.4. Electronic Operation of the CO
2
Sensor
The CO
2
PCA which is mounted to the rear side of the Relay Board Mounting Bracket controls the CO
2
Sensor.
It converts the sensor’s digital output to an analog voltage that is measured with the motherboard and draws 12
VDC from the analyzer via the relay card from which converts to fit the power needs of the probe and its own
onboard logic. It outputs a 0-5 VDC analog signal to the analyzer’s CPU via the motherboard that corresponds
to the concentration of CO
2
measured by the probe.
Figure 5-18: CO
2
Sensor Option PCA Layout and Electronic Connections