PPC2 AF OPERATION AND MAINTENANCE MANUAL
© 1998 DH Instruments, Inc. Page 6
1.2.8 TRANSDUCER SELECTION MODULE
Internal Layout
The transducer selection module includes solenoid valves to connect and disconnect the low
pressure (secondary) reference transducer from the test system and to independently vent
the low pressure reference transducer.
1.2.9 REFERENCE PRESSURE TRANSDUCERS
Internal Layout
There are two reference pressure transducers. Their basic sensing principle is the
measurement of the change in the natural oscillating frequency of a quartz tuning fork with
temperature and with mechanical stress resulting from the change in pressure applied to a
connecting bellows or bourdon tube. Two independent quartz elements are used: one subjected
to pressure related stress; the other is used only to monitor temperature.
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