Proline Prowirl 73 Troubleshooting
Endress+Hauser 69
9.4 Process errors without messages
You may have to change or correct settings in certain functions of the function matrix in order to
rectify faults. The functions outlined below (e.g. FLOW DAMPING) are described in detail in the
"Description of device functions" section (ä 95).
Symptoms Remedial measures
No flow signal • In the case of liquids: check whether the piping is completely filled. The piping must always be completely filled for
accurate and reliable flow measurement.
• Check whether all the packaging material, including the meter body protective covers, was completely removed before
mounting the device.
• Check whether the desired electrical output signal was connected correctly.
Flow signal even though there is no
flow
Check whether the device is exposed to particularly strong vibrations. If so, a flow can be displayed even if the fluid is at
a standstill, depending on the frequency and direction of the vibration.
Remedial measures at the device:
• Turn the sensor 90°. Observe the installation conditions when doing so (ä 17). The measuring system is most
sensitive to vibrations which follow in the direction of the sensor. Vibrations have less of an effect on the device in the
other axes.
• The amplification can be altered using the AMPLIFICATION function (ä 172).
Remedy through constructive measures during installation:
• If the source of the vibration (e.g. pump or a valve) has been identified, the vibrations can be reduced by decoupling or
supporting the source.
• Support the pipe near the measuring device.
If these measures do not solve the problem, your Endress+Hauser service organization can adjust the filters of the device
to suit your special application.
Incorrect or highly-fluctuating flow
signal
• The fluid is not sufficiently single-phase or homogeneous.
Prerequisite for precise and reliable flow measurement:
– Single-phase and homogeneous fluid
– Completely full pipe
• In many instances, the following measures can be taken to improve the measurement result even under non-ideal
conditions:
– In the case of liquids with a low gas content in horizontal pipes, install the device with the head pointing
downwards or to the side. This improves the measuring signal since the sensor is not in the area where gas
accumulates when this type of installation is used.
– In the case of liquids with a low solids content, avoid installing the device with the electronics housing pointing
downwards.
– In the case of steam or gases with a low liquid content, avoid installing the device with the electronics housing
pointing downwards.
• The inlet and outlet runs must be present as per the installation instructions (ä 20).
• Suitable seals with an internal diameter not smaller than the pipe internal diameter must be installed and correctly
centered.
• The static pressure must be large enough to rule out cavitation in the area of the sensor.
• Check whether the correct fluid was selected in the SELECT FLUID function (ä 143). The setting in this function
determines the filter settings and can thus have an effect on the measuring range.
• Check whether the data for the K-factor on the nameplate match the data in the K-FACTOR functions (ä 171).
• Check whether the device is correctly installed in the flow direction.
• Check whether the nominal diameter of the mating pipe and the device match (ä 140).
• The flow must be in the measuring range of the device (ä 78). The start of measuring range depends on the density
and the viscosity of the fluid. Density and viscosity depend on temperature. Density also depends on the process
pressure in the case of gases.
• Check whether the operating pressure is affected by pressure pulsations (e.g. from piston pumps). The pulsations can
affect vortex shedding if they have a frequency similar to the vortex frequency.
• Check whether the correct engineering unit was selected for the flow or totalizer.
• Check whether the current output or pulse value was correctly set.
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