PPCH™ OPERATION AND MAINTENANCE MANUAL
© 2009 DH Instruments, a Fluke Company
Page 92
OPERATION
To view the current reading of the on-board barometer press
[SPECIAL]
,
<7internal>
,
<2baro>
. The display is in the active pressure unit of measure
(see Section 3.3.2).
3.5.7.3
<3PUMP>
PURPOSE
To access special functions associated with the PPCH hydropneumatic pump
and reservoir.
OPERATION
To access the pump functions menu press
[SPECIAL]
,
<7internal>
,
<3pump>
.
The PUMP menu choices include:
<1prime>
To run an automated routine to prime the PPCH’s on-board
hydropneumatic pump when it has pumped air instead of liquid.
(see Section
5.10.1).
<2level>
To view the status of the internal fluid reservoir level switch and
set the action to take when a low level is detected (see Section
3.5.7.3.2).
<3pressure>
To view the pressure measured by the pump drive pressure
transducer and the calculated pump fluid output pressure (see
Section
3.5.7.3.3).
<4hours>
To view a timer of the number of hours the PPCH’s on-board
hydropneumatic pump has been in operation and to reset the
timer if desired (see Section 3.5.7.3.4).
3.5.7.3.1
<1PRIME>
PURPOSE
To run an automated routine to prime the PPCH’s on-board hydropneumatic
pump when it has pumped air instead of liquid.
PRINCIPLE AND OPERATION
This function is considered part of PPCH maintenance and are therefore covered
in the maintenance section of this manual (see Section 5.10.1).
3.5.7.3.2
<2LEVEL>
PURPOSE
To view the status of the internal fluid reservoir level switch and to specify what
PPCH should do when low reservoir is indicated.
PRINCIPLE
PPCH has an internal fluid reservoir (see Section 2.3.6). The reservoir is
equipped with a level switch to provide a warning when the level of the fluid in
the reservoir is low. When the level switch detects a low level in the reservoir, a
warning is provided on the PPCH front panel. The status of the switch can also
be determined by remote command or using
[SPECIAL]
,
<7internal>
,
<3pump>
,
<2level>
,
<1view>
.
By default, when a low reservoir condition is detected, PPCH aborts pressure
control and will not accept any local or remote commands to adjust pressure.
Pressure control is prevented to protect the PPCH hydropneumatic pump which