26
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 ow rate has exceeded 120 % of the measurement range.
Reduce the ow rate to within the range.
When the ow returns to normal, the owmeter will also return to normal automatically.*
Err
1
is displayed. Sensor error
Check for an excessive ow or reverse ow.
When the ow returns to normal, the owmeter 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 ow
rate is zero.
• Check for gas leaks from the piping.
• Check that the wiring is correct.
• If the owmeter is installed vertically, reinstall it horizontally.
If an incorrect zero point of the sensor seems likely to be causing the problem, execute
zero ow rate calibration.
"Zero ow rate calibration" (page 25)
The ow 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 owmeter.
If oil is found, contact the azbil Group and ask for repair.
• Check that the wiring is correct.
• Check that the ow rate does not change within a few seconds.
• Check that the ow rate does not greatly exceed the measurement range.
(In such a case, the indicated ow rate may indicate lower values than the actual ow rate.)
The displayed ow
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, ow path, etc., contact the azbil Group and ask
for repair.
There should be no
ow but a ow is
indicated.
Even though the
displayed instanta-
neous ow rate is
zero, the totalized
ow is counting up
or counting down.
• Check for a gas leak or ow in the piping.
Even if the displayed instantaneous ow rate is zero, there might be a very small ow
below the minimum displayed ow rate.
Even such a small ow is counted in the totalized ow.
Set the low ow cuto to prevent totalized ow count-up or countdown.
Function setup 12, "Low ow cuto" (page 19)
* If the ow rate greatly exceeds the ow rate range,
ALH
1
may not be displayed.
■
Behavior
when the ow rate greatly exceeds the measurement range (P.7)
Chapter 5. Troubleshooting
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