PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 14
2.4.2
CHECK PROPER PRESSURE MEASUREMENT OPERATION
2.4.2.1
CHECKING ABSOLUTE MODE PRESSURE MEASUREMENT
If the PPC2+ has an absolute RPT (designated AXXXX), check that it operates
properly in absolute mode.
If the PPC2+ is not vented (vent LED OFF), press the [VENT] direct pressure control
key to vent the PPC2+ (VENT LED ON) (see Section 3.1.2.2).
Using the [RANGE] function key to change ranges if necessary (see Section 3.2.1)
select a range of the absolute RPT.
Press the [UNIT] function key and select <absolute> mode. Change the pressure
unit if desired (see Section 3.2.2).
Observe the current value of atmospheric pressure. Check that the value agrees with
the local value of atmospheric pressure. Repeat this process for all the ranges on
both RPTs if the PPC2+ has two absolute RPTs. Check that the values of
atmospheric pressure measured by the different ranges agree with each other within
PPC2+ measurement tolerances (see Section 1.2.2). If they do not agree within
tolerances, PPC2+ may need calibration or repair.
2.4.2.2
CHECKING GAUGE MODE PRESSURE MEASUREMENT
If the PPC2+ is not vented, press the [VENT] direct pressure control key to vent it
(see Section 3.1.2.2).
Press the [UNIT] function key and select <gauge> mode. Change the pressure unit if
desired (see Section 3.2.2).
Observe that, within ten seconds, zero is indicated. It is normal for PPC2+ to indicate
a value other than zero for up to ten seconds when first entering gauge mode.
Using the [RANGE] function key to change ranges, observe that zero is indicated for
each range within 10 seconds. It is normal for PPC2+ to indicate a value other than
zero when vented when gauge mode is first entered or ranges are changed.
After about ten seconds, the VENT LED should flash and zero should be indicated.
If this does not occur, check that the AUTOZERO function is ON (see Section 3.4.1).
If AUTOZERO is ON and display will not zero when vented, PPC2+ may need repair.
2.4.3
LEAK CHECK
If desired, perform a leak check of the test system (see Section 3.2.8).
Summary of Contents for PPC2+
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