Process Error Messages - Endress+Hauser Promass 40 Operating Instructions Manual

Promass 40
Endress+Hauser
9.3

Process error messages

Type Error message / No.
Process errors can be defined as either "Fault" or "Information" 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 26 ff. and 42
P = Process error
= Fault message (with an effect on the inputs and outputs)

! = Information message (without an effect on the inputs and outputs)
P OSC. AMP. LIMIT
# 586

P TUBE NOT OSC
# 587

P NOISE LIMIT
# 588

P EMPTY PIPE
! # 700
P EXC. CURR. LIM
! # 701
Cause
The fluid properties do not allow a
continuation of the measurement.
Causes:
– Extremely high viscosity
– Process fluid is very inhomoge-
neous (gas or solid content)
Extreme process conditions exist.
The measuring system can there-
fore not be started.
Overdriving of the internal analog
to digital converter.
Causes:
– Cavitation
– Extreme pressure pulses
– High gas flow velocity
A continuation of the measure-
ment is no longer possible!
The process fluid density is below
the lower limit value set in the
"EPD" function.
Causes:
– Air in the measuring tube
– Partly filled measuring tube
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.
9 Trouble-shooting
Remedy
Change or improve process
conditions.
Change or improve process
conditions.
Change or improve process condi-
tions, e.g. by reducing the flow
velocity.
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.
In particular with outgassing fluids
and/or increased gas content, the
following measures are recom-
mended to increase system
pressure:
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.
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