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Proline Prosonic Flow 91
Endress+Hauser
9
Troubleshooting
9.1
Troubleshooting instructions
Always start troubleshooting with the checklist below, if faults occur after startup or during
operation. This takes you directly (via various queries) to the cause of the problem and the
appropriate remedial measures.
Check the display
No display visible and no output
signals present
No display visible but output
signals are present
Display texts are in a foreign
language.
Measured value indicated, but no
signal output at the current or
pulse output.
Diagnosis code on the display
The measuring device is monitored during commissioning and operation. The results are shown on the display in the
form of diagnosis code messages. Diagnosis code messages help the user detect current conditions and errors. Depending
on the diagnosis code displayed, it is then possible to service the measuring device.
Depending on the diagnosis code, the behavior of the device can also be affected. Where permitted, the user has the
option of deactivating alarms and defining them as notice messages.
There are 4 categories of diagnosis code messages: F, C, S, and M:
Category F (failure):
The device does not function as it should such that the measured values cannot be used. This also includes some process
errors.
Category C (function check):
The device is being serviced, assembled, configured or is in the simulation mode. The output signals do not correspond to
the actual process values and thus cannot be used.
Category S (outside specification):
One or more measured values (e.g. flow etc.) are outside the specified limit values that were specified at the factory or by
the users themselves. Diagnosis messages of this category are also displayed during measuring device startup or during
cleaning processes.
Category M (maintenance):
The measuring signals are still valid but are affected by factors such as wear, corrosion or fouling.
The diagnosis code messages are grouped as follows within the F, C, S and M Categories:
No. 000 – 199: Messages affecting the sensor.
No. 200 – 399: Messages affecting the transmitter.
No. 400 – 599: Configuration-related messages (simulation, download, data storage etc.)
No. 800 – 999: Process-specific messages
Other errors (without error messages)
Some other error has occurred.
1. Check supply voltage → Terminal 1, 2
2. Check device fuse → ä 58
85 to 250 V AC: 1 A slow-blow / 250 V
20 to 28 V AC and 11 to 40 V DC: 1.6 A slow-blow / 250 V
3. Electronics defective → Order spare part → ä 55
1. Check whether the ribbon-cable connector of the display module is correctly
plugged into the amplifier board → ä 56
2. Display module defective → Order spare part → ä 55
3. Electronics defective → Order spare part → ä 55
Switch off power supply. Press and hold down the OS keys simultaneously and
switch on the measuring device again. The display text will appear in English (default)
and is displayed at maximum contrast.
Electronics PCB defective → Order spare part
Diagnosis and remedial measures → ä 53
Troubleshooting
→ ä 55
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