Process Errors Without Messages - Endress+Hauser Proline Promass 83 Operating Instructions Manual

Troubleshooting
Symptoms
Comment:
You may have to change or correct certain settings of the function matrix in order to rectify faults. The functions outlined below, such as DISPLAY DAMPING, for
example, are described in detail in the "Description of Device Functions" manual.
Measured-value reading fluctuates
even though flow is steady.
Flow values are negative, even though
the fluid is flowing forwards through
the pipe.
Measured-value reading or measured-
value output pulsates or fluctuates, e.g.
because of reciprocating pump,
peristaltic pump, diaphragm pump or
pump with similar delivery
characteristic.
There are differences between the
flowmeter's internal totalizer and the
external metering device.
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
arisen.
In these instances, please contact your
E+H service organization.
96
9.4

Process errors without messages

Rectification
1. Check the fluid for presence of gas bubbles.
2. TIME CONSTANT function → increase value (→ OUTPUTS / CURRENT OUTPUT / CONFIGURATION
3. DISPLAY DAMPING function → increase value (→ USER INTERFACE / CONTROL / BASIC CONFIGURATION)
Change the setting in the INSTALLATION DIRECTION SENSOR function accordingly
Run the "Pulsating Flow" Quick Setup.→ Page 60
If the problem persists despite these measures, a pulsation damper will have to be installed between pump and measuring
device.
This symptom is due primarily to backflow in the piping, because the pulse output cannot subtract in the "STANDARD" or
"SYMMETRY" measuring modes.
The problem can be solved as follows:
Allow for flow in both directions. Set the MEASURING MODE function to "Pulsating Flow" for the pulse output in
question.
1. Check the fluid for presence of gas bubbles.
2. Activate the ON-VAL. LF-CUTOFF function, i.e. enter or increase the value for the low flow cut off (→ BASIC
FUNCTION / PROCESS PARAMETER / CONFIGURATION).
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 to quote the following
information:
– Brief description of the fault
– Nameplate specifications: order code, serial number → Page 9 ff.
Returning devices to Endress+Hauser
Carry out the measures listed before you return a flowmeter requiring repair or calibration to Endress+Hauser. Page 8
Always enclose a duly completed "Declaration of contamination" form with the flowmeter. You will find a preprinted
blank of the Dangerous Goods Sheet at the back of this manual.
Replace transmitter electronics
Components in the measuring electronics defective → order spare parts → Page 98
Proline Promass 83 MODBUS RS485
Endress+Hauser