Process Errors Without Messages - Endress+Hauser Proline Prosonic Flow 93T Portable Operating Instructions Manual

Proline Prosonic Flow 93T Portable
Endress+Hauser
9.4

Process errors without messages

Symptoms
!
Note!
You may have to change or correct certain settings of the function matrix in order to rectify faults. For an explanation of
the functions listed below, e.g. DISPLAY DAMPING, see  ä 65 ff.
Negative flow values displayed even
though the fluid is flowing forwards in
the pipe.
Measured value reading fluctuates even
though flow is steady.
The measured value display or
measured value output is pulsating or
fluctuating, e.g. due to reciprocating
pumps, peristaltic pumps, diaphragm
pumps or pumps with similar
transporting characteristics.
Measured value reading shown on
display, even though the fluid is at a
standstill and the measuring tube is full.
The fault cannot be rectified or some
other fault not described above has
occurred.
In these instances, please contact your
Endress+Hauser service organization.
Rectification
1. Check the wiring  ä 31.
If necessary, switch the connections for the terminals for "up" and "down".
2. Change the "INSTL. DIR. SENSOR" function accordingly.
1. Check the fluid for presence of gas bubbles.
2. "TIME CONSTANT" function (current output)  Increase value
3. "DISPLAY DAMPING" function  Increase value
Run the "Pulsating Flow" Quick Setup  ä 71.
If these measures do not rectify the problem, a pulsation damper has to be
installed between the pump and the flowmeter.
1. Check the fluid for presence of gas bubbles.
2. Activate the "LOW FLOW CUTOFF" function, i.e. enter or increase the
value for the switch point.
The following options are available for tackling problems of this nature:
Request the services of an Endress+Hauser service technician
If you contact our service organization to have a service technician sent out,
please be ready with the following information:
– Brief description of the fault
– Nameplate specifications: order code and serial number
Return devices to Endress+Hauser
The measures listed must be carried out before you return a measuring device
requiring repair or calibration to Endress+Hauser.
Always enclose the duly completed "Declaration of Contamination" form with
the flowmeter. You will find a preprinted blank of this form at the back of this
manual.
Troubleshooting
55