Pulsar
2
Service Manual
OPTIKON 2000
Cod. 111004SEN Rev.C
5-22
5.5 SENSORS BOARD 393120
The 393120 Sensors board: contains:
- The circuitry of the pressure sensor (mounted on the board) used to monitor the
output pressure of the primary regulator. The balanced output of the strain gauge
sensor is voltage buffered by U1-A-B, then delivered to the differential amplifier
U1-C.
U1-D allows subtracting the fixed voltage generated by U3-D-C to remove the
offset, the trimmer R45 partitions the output of U1-D to adjust the gain.
- The Amplifier of the vacuum sensor (mounted on the 369130 Vacuum Signal filter)
used to monitor the vacuum level in the aspiration line (ACS3).
U3-B subtracts the fixed voltage generated by U3-A to allow offset adjustment.
The R50 trimmer is for gain adjustment.
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