DH Instruments E-DWT-H, Руководство по эксплуатации и обслуживанию

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E-DWT-H OPERATION AND MAINTENANCE MANUAL
© 2009 DH Instruments, a Fluke Company Page 108
SYMPTOM PROBABLE CAUSE SOLUTION
“Hi (or Lo) Q-RPT EXCEEDED
PMAX” displays alternating with
normal display.
RPM4-E-DWT Q-RPT has been
overpressured (Pmax! exceeded).
Correct the overpressure condition and
cycle power ON and OFF to clear.
Q-RPT may be damaged. 3.8.4.1
Display is
<!!!LO RPT ACTIVE!!!>
the E-DWT-H CAUTION LO RPT
ACTIVE light is flashing and
RPM4-E-DWT is beeping.
The Lo Q-RPT is receiving pressure but the
Hi Q-RPT is currently selected.
Since the Hi Q-RPT is selected on
RPM4-E-DWT, the Lo Q-RPT should be
shut off by the Lo Q-RPT shut off
valve.
Reduce pressure and close the
Lo Q-RPT shut off valve or select the Lo
Q-RPT on the RPM4-E-DWT. Do not
apply more than 1 000 psi (7 MPa) to
the Lo Q-RPT. 3.4
A
Ready
(green
Ready/Not Ready
indicator) indication is never
achieved.
Stability settings is too tight and/or existing
conditions will not allow
Ready
to be
achieved.
Adjust stability setting or correct other
conditions. Consider using an AutoTest to
set stability appropriately. 3.8.3, 3.1.2,
3.7.11
Display update rate of indicated
pressure changes when changing
pressure. RPM4-E-DWT automated read rate function
is ON to automatically adjust read rate
depending upon rate of change of pressure.
Operation is normal. Turn automated
read rate function OFF if desired. 3.9.7.2
Display update of indicated
pressure is too slow when
pressure is changing quickly.
RPM4-E-DWT automated read rate function
is OFF.
Turn automated read rate function ON to
automatically adjust read rate depending
on pressure rate of change. 3.9.7.2
Pressure is changing but display
of pressure is NOT and the
bottom right hand corner of the
display is a numerical countdown
followed by
<avg>.
Average DISPLAY function is ON and
pressure display is updating only with the
average value at the end of each averaging
cycle. Go to a DISPLAY function other than
average or press
[+/-] to get the
instantaneous value Average DISPLAY.
3.7.7, 3.7.7.1
These is a leak in the pressure system to
which E-DWT-H is connected. Find and correct leak. Consider using
RPM4-E-DWT leak check function. 3.7.6
The pressure applied to the RPM4-E-DWT
has recently been changed and the pressure
is still stabilizing.
The time it takes for pressure to stabilize
after making a pressure change
increases with the size of the pressure
change and size of the test volume. Up
to three minutes or more can be required
for pressure to stabilize within 0.01% of
the measured pressure
Pressure indicated by
RPM4-E-DWT never becomes
stable.
The RPM4-E-DWT display resolution is
higher than is necessary and you are
observing normal evolution of the pressure
(Note: if viewed with enough resolution,
pressure is NEVER perfectly stable)
.
Use the resolution setting function,
AutoRange or AutoTest to reduce
resolution to a level that is appropriate
for the test being run or the uncertainty of
the device being calibrated. 3.8.2, 3.7.5,
3.7.11
Disagreement between two Q-RPTs
in system appears excessive. Difference is actually within tolerance and
acceptable disagreement.
Compare differences observed to
tolerances on Q-RPT measurements.
1.2.3.1
Apparent inaccurate pressure
control/measure and little or no
response from Q-RPT:
Reference transducer destroyed by
overpressure. Contact DHI Authorized Service Provider.
Table 19
Incorrect pressure units.
Set desired pressure. Consider reference
temperature if unit is inWa. 3.7.3
Q-RPT calibration coefficients have been
altered. Check and correct calibration coefficients if
needed. 5.2.2 Apparent inaccurate pressure
measurement.
RPM4-E-DWT has not been AutoZeroed or
had been AutoZeroed incorrectly.
Run AutoZ correctly. 3.9.1
Apparent inaccurate pressure
measurement and
<h> is
displayed on top line of screen.
An unplanned “head” correction is active or
head height or fluid is incorrect. Operation is normal. Remove or change
“head” correction. 3.7.8
AutoZ was just run but
measurement indication is NOT
zero.
<h> is displayed on top line
of screen.
A head correction is applied and current
indication is the value of the head. Operation is normal. 3.7.8, 3.9.1