Specifications

6. TROUBLESHOOTING
Page 153 © 1998-2007 DH Instruments, a Fluke Company
Table 25. Troubleshooting Checklist (Continued)
SYMPTOM PROBABLE CAUSE SOLUTION
Flow rate is changing but display of flow 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.
(3.4.6.2)
Current flow through molbloc-L is zero but
reading is not zero.
Need to run TARE function to zero
molbox RFM RPTs.
Run TARE. (3.4.4.1)
Poor flow measurement characterized by
instability and sudden small jumps in flow
rate.
The molbox RFM pneumatic circuit
is contaminated with liquids.
Purge and clean molbox RFM and
associated pneumatic systems. Contact
your DHI Authorized Service Provider.
Grossly inaccurate flow measurements
and little or no response to pressure or
flow changes.
RPT(s) destroyed by overpressure.
View pressure readings using [P&T]. If
readings are grossly inaccurate and don’t
respond to pressure changes, contact your
DHI Authorized Service Provider. (3.4.5,
3.1.6.2, 3.6.7)
Apparent inaccurate pressure
measurement.
Incorrect pressure units. Set desired pressure units. Consider
reference temperature if unit is inWa.
(3.5.2)
Apparent inaccurate pressure or flow
measurement.
Reference pressure transducer
(RPT) calibration coefficients have
been altered or lost and pressure
measurements are incorrect.
Check and correct calibration coefficients if
needed. (5.2)