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PPCK+™ Operation and Maintenance Manual
Page 35
©2001
DH Instruments, Inc
.
OPERATION
When the
[UPPER LIMIT]
function key is pressed from the main run screen the
display is:
1. Entry field to enter desired upper limit value.
Enter the desired upper limit value and PPCK+ returns to the main run screen with a new
upper limit value active.
When the UPPER LIMIT has been exceeded, the display of current pressure flashes and
an intermittent beep sounds. To return to normal operation, reduce pressure using
manual pressure control keys or an automated pressure command.
Upper limit values are specific to each range
and
measurement mode. Be careful not to
assume that the upper limit set in one measurement mode will apply to the other.
For example, if you set 4 000 psi as the upper limit in absolute mode, the upper limit will
not be (4 000 psia - atmospheric pressure) in gauge mode. The gauge mode upper limit
for that range will still be the default limit or another limit that has been set in
gauge mode.
Upper limits are always specified and displayed in the current pressure unit.
3.2.4.1
OVERPRESSURE FUNCTION
In addition to the UL function, PPCK+ has an overpressure function
.
This function
executes when the maximum RPT range is exceeded by 25 %. The function causes
all pressure control to be interrupted and disabled, changes the range to H3 and
causes the display to flash. The overpressure function also logs the time and date of
the overpressure condition to assist in incident diagnosis. To recover from an
overpressure condition, cycle PPCK+ power.
3.2.5
[SEQ] SEQUENCE
PURPOSE
Not supported in PPCK+.
1
Upper Limit: H3
6300 psi a
Summary of Contents for PPCK PLUS
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