Azbil MVC10A, User Manual

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Maintenance and troubleshooting of this instrument Azbil Corporation
5-6 Model: MVC10A/10F - Multivariable Air Flow Meter
Troubles during operation
Troubleshooting
If any trouble occurs during operation, take actions in the steps specified below.
• Look for the symptoms of the trouble described in the table on this page. When
the corresponding details are found, take actions by following the instructions.
• If the trouble still remains unsolved, this instrument may be malfunctioning.
Then, please contact our sales representatives at our branch, sales office, or
our distributors where you purchased this instrument, or our customer services
department of our head office.
Trouble Check points and remedies
Output value deviates from the
expected flow rate.
• Check for any fluid leakage from the piping.
• Ensure that the fluid is not flowing in the reverse
direction.
• Ensure that the polarity of detector terminals and
connection of the converter are correct.
• Ensure that the unit of flow rate displayed is correct.
Main display is flashing.
• The flow rate exceeds the measurement precision
compensation range. Ensure that the differential pressure
generated in the detector meets the following condition:
Differential pressure ≤ Static pressure × 0.25
Output value exceeds 100%.
• Ensure that the range is correctly set.
•
Ensure that the zero point is correctly adjusted.
Output value remains unchanged at
0%.
• Ensure that the details of setting are correct.
•
Ensure that the flow rate does not deviate from the low
flow cut range.
• Ensure that the piping is not clogged.
Sub display does not give
instantaneous and totalized cost
values, or the cost values on main
display remain unchanged at zero.
• Ensure that the cost weight is not deviated from “0.”
•
Changing the unit of totalized cost causes the automatic
reset of the cost weight to “0.”
Pulse output value is excessive
relative to the flow rate.
• Ensure that the pulse settings (weight and width) are
correct.
• Ensure that correct specifications for pulse counter are
used.
• Ensure that the value of low flow cut is correctly set.