DH Instruments PPCK PLUS, Operation And Maintenance Manual

Page: 22 / 150

PPCK+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc .
Page 14
2.4 POWER-UP AND VERIFICATION
2.4.1 SWITCH POWER ON
Actuate the power switch on the PPCK+ rear panel. Observe the front panel display as
PPCK+ initializes, error checks and goes to the main run screen (see Section 3.1.1).
PPCK+ operating condition at power-up is all valves closed. Powering down PPCK+ also
causes all valves to close.
If the PPCK+ fails to reach the main run screen, service is required. Record the sequence of
operation and displays observed and contact a
DHI Authorized Service Provider (see
Table 22).
The pressure range that was active on power down is active on power up.
2.4.2 CHECK PROPER PRESSURE MEASUREMENT OPERATION
2.4.2.1 CHECKING ABSOLUTE MODE PRESSURE MEASUREMENT
Check that the PPCK+ operates properly in absolute mode.
If the PPCK+ is not vented, press the [VENT] manual pressure control key to vent
the PPCK+ (VENT LED ON) (see Section 3.1.2.2). Open the TEST port as well to be
sure the RPT is exposed to atmospheric pressure.
Press the [UNIT] function key and select <absolute> measurement mode (see
Section 3.2.2). Change the pressure unit if desired (see Section 3.2.2).
Observe the current value of atmospheric pressure displayed on the PPCK+ main
run screen (see Section 3.1.1). Check that the value agrees with the local value of
atmospheric pressure within measurement tolerances. Repeat this process for all
three PPCK+ ranges. Check that the values of atmospheric pressure measured by
the different ranges agree with each other within PPCK+ measurement tolerances
(see Section 1.2.2). If the values do not agree within tolerances, PPCK+ may need
calibration or repair.
2.4.2.2 CHECKING GAUGE MODE PRESSURE MEASUREMENT
If the PPCK+ is not vented, press the [VENT] manual pressure control key to vent
the PPCK+ (VENT LED ON) (see Section 3.1.2.2). Open the TEST port as well to be
sure the RPT is exposed to atmospheric pressure.
Press the [UNIT] function key and select <gauge> mode (see 3.2.2). Change the
pressure unit if desired (see Section 3.2.2).