DH Instruments PPCK PLUS, Operation And Maintenance Manual

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PPCK+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc .
Page 54
When Ready , press [ENTER] . The next
display is:
The new ZOFFSET is the ZOFFSET calculated from this execution of run AutoZ.
Press [ENTER] to activate the new ZOFFSET and return to the main run screen.
Press [ESCAPE] to maintain the old ZOFFSET and return to the main run screen.
For PPCK+ to communicate with an RPM connected to it's COM2 port, the PPCK+ and
the RPM RS232 interfaces must be set up properly (see Section 3.4.4.3). If the
PPCK+ is unable to locate an RPM on COM2 when running AutoZ by COM2, after
6 seconds it will time out and display <RPM not detected>.
The value of ZOFFSET is always displayed and entered in Pascal (Pa).
3.4.2 HEAD

PURPOSE
To specify the configuration of the HEAD function (see Section 3.2.7) including the length
unit of measure for head height entry and the test gas species for head
pressure calculations.

OPERATION
From the main run screen, press [SPECIAL] and
select <2Head> . The display is:
Select the desired head height unit. The next
display is:
Select the type of gas that is being supplied to PPCK+. The characteristics of the gas
selected will be used by PPCK+ in calculating head pressures.
Old ZOFFSET: 0.0 Pa
New ZOFFSET: 756.8 Pa
Head height unit:
1in 2cm
Gas type:
1N2 2He 3Air