9 Trouble-shooting PROline Promass 80
68 Endress+Hauser
P
!
FLUID INHOM.
# 702
Frequency control is not stable,
due to inhomogeneous process
fluid, e.g. gas or solid content.
In particular with outgassing fluids
and/or increased gas content, the
following measures are
recommended to increase system
pressure:
1. Mount the instrument at the
outlet side of a pump.
2. Mount the instrument at the
lowest point of an ascending
pipeline.
3. Install a flow restriction, e.g.
reducer or orifice,
downstream from the
instrument.
P
!
NOISE LIMIT
# 703 / 704
Overdriving of the internal analog
to digital converter.
Causes:
– Cavitation
– Extreme pressure pulses
– High gas flow velocity
A continuation of the
measurement is still possible!
Change or improve process
conditions, e.g. by reducing the
flow velocity.
P
$
FLOW LIMIT
# 705
The mass flow is too high.
The electronics' measuring range
will be exceeded.
Reduce flow
P
!
ADJ. ZERO FAIL
# 731
The zero point adjustment is not
possible or has been cancelled.
Make sure that zero point
adjustment is carried out at “zero
flow” only (v = 0 m/s)
→
Page 52.
Type Error message / No. Cause Remedy
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