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18. SELF-DIAGNOSIS FUNCTION
This flowmeter is equipped with self-diagnosis function. Use this function for early detection of abnormality,
troubleshooting, etc.
Flow measurement can continue even during self-diagnosis operation. Diagnosis can be executed periodically
even normal measurement is in operation. This function reports an error or alarm if any abnormality is found.
Self-diagnosis can be operated automatically or manually from the Setup menu.
Regarding the self-diagnosis during normal measurement, valid or invalid can be switched per item through
self-diagnosis setting.
In the case of diagnosis being operated by manual operation, diagnosis is implemented instead of self-
diagnosis setting.
→
Refer to "12.5 Display Transition (5) Setting Diagnosis and Maintenance Functions".
18.1 Self-diagnosis Items
■
Circuit voltage measurement
Measures voltages in the transmitter circuits. If the voltage is out of the specified range, normal measurement
may not be performed. If diagnosis shows abnormality, contact your nearest sales office or service center.
■
Coil and exciting circuit abnormality diagnosis
Checks for any abnormality in the coil or exciting circuit of the probe. If the measurement value is outside the
specified range, exact measurement may not be performed.
If diagnosis shows abnormality, contact your nearest sales office or service center.
■
Empty detection diagnosis
Checks whether the electrode of the probe is wetted or not. As this flowmeter is based on the assumption that
the pipe measured is filled completely, exact measurement may not be achieved with empty pipe. If abnormality
judgment occurs, make sure the pipe is full of fluid. If abnormality judgment occurs regardless of the full state of
pipe, abnormality in the probe or transmitter is suspected. Contact your nearest sales office or service center.
NOTE: Empty detection may not function if inside the probe is wetted.
■
Measurement error signal diagnosis
Investigates whether or not the measurement signal level inside the transmitter is within the specified range.
Typically, when noise is superimposed on the measurement signal due to poor grounding, abnormality judgment
will occur.
NOTE: Make sure grounding is correct in accordance with grounding procedure. If the abnormality is not
cleared even after the inspection of grounding, contact your nearest sales office or service center.
