9 Trouble-shooting Promass 40
40 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 recom-
mended to increase system pres-
sure:
1. Install the device at the outlet
side of a pump.
2. Install the device 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 measure-
ment is still possible!
Change or improve process condi-
tions, 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 adjust-
ment is carried out at “zero flow”
only (v= 0 m/s)
→ Page 28
Type Error message / No. Cause Remedy
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