PROline Promass 80 9 Trouble-shooting
Endress+Hauser 67
9.3 Process error messages
Type Error message / No. Cause Remedy
Process errors can be defined as either “Fault” or “Notice” messages and can thereby be weighted
differently. Determination of this is done via the function matrix (see the “Description of Device Functions”
Manual). The error types listed in the following correspond to the factory settings.
Also observe the information on
→ Page 34 ff. and 70
P = Process error
$ = Fault message (with an effect on the inputs and outputs)
! = Notice message (without an effect on the inputs and outputs)
P
$
OSC. AMP. LIM.
# 586
The fluid properties do not allow a
continuation of the measurement.
Causes:
– Extremely high viscosity
– Process fluid is very
inhomogeneous (gas or solid
content)
Change or improve process
conditions.
P
$
TUBE NOT OSC
# 587
Extreme process conditions exist.
The measuring system can
therefore not be started.
Change or improve process
conditions.
P
$
NOISE LIMIT
# 588
Overdriving of the internal analog
to digital converter.
Causes:
– Cavitation
– Extreme pressure pulses
– High gas flow velocity
A continuation of the
measurement is no longer
possible!
Change or improve process
conditions, e.g. by reducing the
flow velocity.
P
!
EMPTY PIPE
# 700
The process fluid density is
outside the upper or lower limit
values set in the “EPD” function
Causes:
– Air in the measuring tube
– Partly filled measuring tube
1. Ensure that there is no gas
content in the process liquid.
2. Adapt the values in the “EPD”
function to the current process
conditions.
P
!
EXC. CURR. LIM.
# 701
The maximum current value for
the measuring tube exciter coils
has been reached, since certain
process fluid characteristics are
extreme, e.g. high gas or solid
content.
The instrument continues to work
correctly.
In particular with outgassing fluids
and/or increased gas content, the
following measures are
recommended to increase system
pressure:
1. Install the instrument at the
outlet side of a pump.
2. Install the instrument at the
lowest point of an ascending
pipeline.
3. Install a flow restriction, e.g.
reducer or orifice,
downstream from the
instrument.
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