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Troubleshooting
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Remedy for abnormal phenomena
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Chapter 6. MAINTENANCE AND TROUBLESHOOTING
Phenomenon
Remedy
The display does not indicate anything.
• Check that the batteries are not dead and that the polarity is correct.
• Check that the connector is connected correctly.
Shutting the front and back valves of the • Check for air leaks
MCF, etc., the actual flow rate should be • Check that wiring is correct.
zero, but the flow rate display does not
• When the MCF is mounted on a horizontal pipe and the display unit
indicate zero.
faces the side, zero point drift may be caused by the mounting
direction. Set the low flow cutoff to 5 % FS.
• If the MCF is mounted where the ambient temperature or the
temperature of the measured gas fluctuates widely, the MCF might
detect convection inside the pipe as a flow. Try measuring after the
temperature stabilizes.
Measurement error has increased and
• Check for air leaks.
exceeds the accuracy specifications.
• Check if foreign matter is stuck on the main path orifices. If so, remove
it.
• After detaching the measurement module from the main path, check if
foreign matter is present or stuck on the bypass inlet/outlet of the main
path. If so, blow it off with compressed air.
• After detaching the measurement module from the main path, check if
the internal filter is stained. If so, clean it.
• Check if there is foreign matter such as dust or oil on the pipe or the
connection port of the MCF. If there is foreign matter, contact the azbil
Group.
• Check that the wiring is correct.
• Check if the flow fluctuates widely, or if it greatly exceeds the
measurable limit.
• Check if there is a pulsation source.
