PPCH-G™ OPERATION AND MAINTENANCE MANUAL
© 2007 DH Instruments, a Fluke Company
Page 34
OPERATION
Pressing the
[RANGE]
function key activates the range viewing and selecting function.
When the
[RANGE]
function key is first pressed, the range identification screen for the active
range is displayed. For example:
1.
Q-RPT or utility sensor designator.
2. Type of range.
<DF>
for the Q-RPT’s default range;
<AR>
for a
range created by AutoRange.
3.
Q-RPT or utility sensor position designator.
4.
Current pressure unit of measure.
5. Full scale pressure in current unit of measure in gauge and/or
absolute measurement mode depending on the measurement modes
available.
Active A70M DF IH
MPa 70g/70a
Pressing the
[+/-]
key or the
[RANGE]
key again while in the RANGE function toggles
through displays of the other available ranges, from lowest range to highest range.
To select a range to become the active range, press
[ENT]
while the desired range is
displayed. PPCH-G must be vented for the range change to occur. Press
[VENT]
if
necessary to complete the range change.
When selecting a range, if the range’s Q-RPT is an external Q-RPT and the PPCH-G cannot
communicate with it, PPCH-G displays
<Cannot find range’s external Q-RPT (Xn)>
(where
<Xn>
is the Q-RPT position designator). Use
[ENT]
or
[ESC]
to return to the range selection
screen. For information on setting up and communicating with external Q-RPTs see Sections
3.2.5, 2.3.7.1).
Pressing
[ESC]
while in the RANGE function returns to the MAIN RUN screen without
making any range change.
Range full scale limits are given in the pressure unit that is currently active for
that range. Change the active unit (see Section 3.3.1) to display the range limits in a different unit.
Pressing [+/-] from the MAIN RUN screen provides a shortcut to a momentary view of the
range identification screen for the active range.
PPCH-G saved AutoRange ranges that use Q-RPTs in external RPM4s are available for
selection from the [RANGE] key. AutoRange ranges saved locally on the RPM4, are not available
on the PPCH-G [RANGE] key.
Many PPCH-G settings and functions are range specific. See Table 5 for identification of
range specific settings.
To protect against overpressure situations and for maximum measurement performance,
the active range can only be changed when the system is vented. If [ENT] is pressed while in the
RANGE function when PPCH-G is NOT vented, the display indicates <Vent system fully to change
range>. Pressing the [VENT] key causes PPCH-G to vent and complete the range change.
