PPCH-G™ OPERATION AND MAINTENANCE MANUAL
© 2007 DH Instruments, a Fluke Company
Page 140
5.9.2.9
INLET CONTROL VALVE
Highly progressive needle valve. The valve is operated by a stepping motor and
drive belt. Used to precisely control the flow of supply gas to the
TEST
port.
5.9.2.10
OUTLET CONTROL VALVE
Highly progressive needle valve. The valve is operated by a stepping motor and
drive belt. Used to precisely control the exhaust from the
TEST
port.
5.9.2.11
THERMAL PRESSURE CONTROL UNIT (TPCU)
High pressure volume containing a helicoidal heating element. The TPCU is used
for fine pressure control in standard dynamic control mode (see Section 3.2.2.2).