Azbil Micro Flow CMS 0200, Руководство пользователя, Страница: 34 / 52

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Countermeasures for abnormal operation
See the following table in case of abnormal operation of this device.
Phenomenon Countermeasure
The display is blank. • Check that the supplied power and polarity are correct.
• Check that the connector is connected correctly.
ALH 1
is displayed. The instantaneous flow rate has exceeded 120 % of the measurement range.
Reduce the flow rate to within the range.
When the flow returns to normal, the flowmeter will also return to normal automatically.*
Err 1
is displayed. Sensor error
Check for an excessive flow or reverse flow.
When the flow returns to normal, the flowmeter will also return to normal automati-
cally.
If the device does not return to normal, contact the azbil Group.
Call for repair.
Err2
is displayed. Memory error
Contact the azbil Group.
Call for repair.
There is an output
signal when the flow
rate is zero. • Check for gas leaks from the piping.
• Check that the wiring is correct.
• If the flowmeter is installed vertically, reinstall it horizontally.
If an incorrect zero point of the sensor seems likely to be causing the problem, execute
zero flow rate calibration.
"Zero flow rate calibration" (page 25)
The flow rate is not
correct. • Check for gas leaks from the piping.
• Check if there is a foreign substance such as dust or oil in the pipe or the connection
port of the flowmeter.
If oil is found, contact the azbil Group and ask for repair.
• Check that the wiring is correct.
• Check that the flow rate does not change within a few seconds.
• Check that the flow rate does not greatly exceed the measurement range.
(In such a case, the indicated flow rate may indicate lower values than the actual flow rate.)
The displayed flow
rate is lower than
expected. • Check if the gas contains oil, moisture, or a foreign substance such as dust or rust.
If foreign matter is found in the piping, flow path, etc., contact the azbil Group and ask
for repair.
There should be no
flow but a flow is
indicated.
Even though the
displayed instanta-
neous flow rate is
zero, the totalized
flow is counting up
or counting down. • Check for a gas leak or flow in the piping.
Even if the displayed instantaneous flow rate is zero, there might be a very small flow
below the minimum displayed flow rate.
Even such a small flow is counted in the totalized flow.
Set the low flow cutoff to prevent totalized flow count-up or countdown.
Function setup 12, "Low flow cutoff" (page 19)
* If the flow rate greatly exceeds the flow rate range,
ALH 1
may not be displayed.
■
Behavior
when the flow rate greatly exceeds the measurement range (P.7)
Chapter 5. Troubleshooting