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Teledyne API – Technical Manual - Model 300E Family CO Analyzers Optional Hardware and Software
79
Figure 5-17: M300E/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
04288D DCN5752