Prosonic Flow 92 9 Trouble-shooting
Endress+Hauser 51
9.3 Process errors without messages
Symptoms Remedial measures
Note!
You may have to change or correct certain settings in functions in the matrix in order to rectify faults. The
functions outlined below, such as TIME CONSTANT, for example, are described in detail in the “Descrip-
tion of device functions” appendix.
Flow values are negative,
even though the fluid is flow-
ing forwards through the
pipe.
1. Check wiring
→ Page 27.
If necessary, reverse the connections “SENSOR UP” and “SENSOR
DOWN”.
Measured value reading
fluctuates even though flow
is steady.
1. Check the fluid for presence of gas bubbles.
2. “TIME CONSTANT” function (see Page 72)
→ increase value
Measured value reading
shown on display even
though the fluid is at a stand-
still and the measuring tube
is full.
1. Check the fluid for presence of gas bubbles.
2. Activate the “LOW FLOW CUT-OFF” function (see Page 73), i.e. enter
or increase the value for the switching point.
The current output signal is
always 4 mA, irrespective of
the flow signal at any given
time.
1. Low flow cut-off too high. Reduce the corresponding value in the “LOW
FLOW CUT-OFF” function (see Page 73).
The fault cannot be rectified
or some other fault not
described above has
occurred.
In these instances, please
contact your E+H service
organisation.
The following options are available for tackling problems of this nature:
Request the services of an E+H service technician
If you contact our service organisation to have a service technician sent
out, please be ready with the following information:
– Brief description of the fault
– Nameplate specifications (Page 9 ff.): order code and serial number
Returning devices to E+H
The procedures on Page 8 must be carried out before you return a flow-
meter requiring repair or calibration to Endress+Hauser.
In all cases, enclose a duly completed “Declaration of Contamination”
form with the flowmeter. You will find a copy of the form at the back of
these Operating Instructions.
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