Table of Contents
Advertisement
CNGmass DCI MODBUS RS485
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, are described in detail in the "Description of Device Parameters" 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 error cannot be eliminated or
another error pattern is present.
In these instances, please contact your
Endress+Hauser service organization.
Endress+Hauser
10.4
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 CONFIG.)
Change the "INSTALLATION DIRECTION SENSOR" function accordingly.
Run the "Pulsating Flow" Quick Setup → ä 46.
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 / PROCESSPARAMETER / CONFIGURATION).
The following solutions are possible:
Request the services of an Endress+Hauser service technician
If you request the services of a service technician, please be ready with the following information:
– Brief error description
– Nameplate specifications: order code and serial number → ä 7
Return the devices to Endress+Hauser
Make sure you carry out the procedures listed before a flowmeter is returned to Endress+Hauser for repair or calibration
→ ä 6.
Always enclose a duly completed "Declaration of Contamination" form with the flowmeter. You will find a master copy of
the Dangerous Goods Sheet at the back of these Operating Instructions.
Replace the transmitter electronics
Parts of the measuring electronics defective → order spare part → ä 83
Troubleshooting
75
Advertisement
Table of Contents
