113
NO.
INDICATION
LIKELY REASON
SOLUTION
7
OLED reading for
Mass Flow, Volumetric
Flow,Gas Pressure or
Gas Temperature is
fl ashing.
Measured parameter
exceeds the range of
the corresponding
sensor in the
instrument.
Reduce the value of the fl ashing
parameter within specifi ed limits.
For example, reduce Mass Flow
rate below 133% of instrument full
scale range. NOTE: When at least
one parameter is fl ashing on the
display, the value of this parameter
and mass fl ow reading cannot be
considered accurate.
PC board or sensor
is defective.
Return DPC to factory for repair.
8
Gas is connected to
the inlet of the DPC,
but there is no fl ow.
The instrument
valve is in "Closed"
mode.
Check "Valve Mode" parameter, it
has to be set to "Auto" to be able
execute requested set point.
The Set Point Source
is different or Set
Point value is zero.
Check that Set Point Source
parameter is properly selected,
make sure SP value more than 0.
9
The error between
DPC mass fl ow
reading and another
meter connected in
series is more
than combined
accuracy for both
instruments.
1. Instruments may
be confi gured to
measure different
Gas.
Make sure there is enough
differential pressure to execute
desired fl ow rate (See Table II "Instru-
ment Pressure Drop").
2. Other meter mass
fl ow may have differ-
ent standard
conditions settings.
Decrease voltage drop in the
signal cable by properly selecting
AWG gage based on cable distance
(use at least 22 AWG for more than
100 ft).
3. There is leakage
in the pipe between
the DPC and other
meter.
3. Check installation
connections for leakage.
10
The Mass Flow
reading is below
the Set Point
value.
The differential
pressure across the
instrument is less
than maximum
pressure drop for
corresponding fl ow
range.
Make sure there is enough
differential pressure to
execute desired fl ow rate (See
Table II "Instrument Pressure
Drop").
The set point is
applied via
analog interface and
connection line is
too long or cable
wires gage is too
high (high resistance
wires
Decrease voltage drop in the
signal cable by properly
selecting AWG gage based on
cable distance (use at least 22
AWG for more than 100 ft).
Summary of Contents for DPC
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