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6.4 Error messages
When any error occurs, the flowmeter will display an error message. Errors can arise because of:
Incorrect control, i.e. faulty connection to the flowmeter, grounding, etc.,
Flowmeter failure
In case of any error, the error message is displayed on the display for approx. 1 to 5 seconds. The same error
message can be read by computer using RS232 or RS485 (command IER?).
After switching on, an internal test of the hardware is performed. If there were any error during the power on
test, the flowmeter would display the appropriate error message.
Types of errors and methods of troubleshooting (if available) are in following table:
Error
Meaning
Internal error
Internal unit error.
Excitation overload
Resistance of excitation coils is
higher than 250 Ohm.
Empty pipe
No liquid in pipe
Temperature out
Temperature of excitation coils
is out of limits.
Frequency over
Incorrect setting of frequency
output.
Flowrate over
Measured flowrate doesn't
correspond with nominal
diameter.
Current open
Current loop is disconnected.
Datalogger full
Memory of datalogger is full.
Except of errors mentioned above the flowmeter reports also errors caused by incorrect communication with
the computer. These errors are described in the chapter „Remote control".
Operation manual
Troubleshooting
Internal error. Turn the flowmeter off and after 5 s
turn on. If the error will appear again, contact
manufacturer.
Resistance of excitation coils is too high (open
circuit). Check sensor connection.
Fill the pipe with liquid. In case there is liquid in the
pipe, clean electrodes and check connection cables
between sensor and electronic.
Temperature of excitation coils (measured liquid) is
out of limits. In case of need change the limits.
Generated frequency is over 12kHz. Correct the
frequency output setting.
Check the nominal diameter setting.
Generated current is over 20mA. Correct the current
output setting.
Read the datalogger using the FlowAssistant
software.
Table 15 : Errors
Electromagnetic flowmeter BFM921
57
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