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Chapter 6.
MAINTENANCE AND TROUBLESHOOTING
■
Remedying trouble
When trouble occurs, refer to the following table:
Problem
Remedy
Nothing is displayed.
• Make sure that the power supply voltage and polarity are correct.
• Check the connectors connecting the display to the sensor/
terminal section for disconnection or faulty contact.
• Check the fuse to see if it has blown. If so replace it. For details
on how to replace the fuse, see the next item
■
How to replace
the fuse.
is displayed alternately
with the flow rate value.
• Check the connectors connecting the display to the sensor/
terminal section for disconnection and faulty contact.
• If the connectors are free of abnormalities, a probable cause is
sensor error. Contact your Yamatake agent as repair by
Yamatake is necessary.
is displayed alternately
with the flow rate value.
• The probable cause is an error in the memory, which is
individually adjusted for each sensor.
is displayed, but the
operation continues with provisional data in spite of the error.
Readjustment by Yamatake is necessary.
The display is other than .
(including a minus display) even
though the instantaneous flow
rate should be zero.
Check the shut-off valve and piping for any leaks. If the valve and
piping are free of leaks, a probable cause is that the device's
characteristics have changed. Contact your Yamatake agent as
repair by Yamatake is necessary.
A minus is displayed for the
instantaneous flow rate.
Make sure that the arrow marked on the flow path matches the
direction of gas flow. Correct the directions if it is reversed.
Indicated flow rate varies
significantly.
• Check that the straight pipe section is long enough.
• If the problem seems to be foreign matter stuck to the sensor or
the effects of a pulsating flow, contact Yamatake Corporation.
Handling Precautions
(memory error) indicates that the individual adjustment data for the
flowmeter's internal sensor has been lost. Accuracy cannot be guaranteed
if use of the flowmeter is continued in this state. Ask for repair.
20
