FDT-25W Wall Mounter Ultrasonic Flowmeter
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5.3 Other Problems and Solutions
1. When the actual flow inside the pipe is not standstill, but the instrument displays 0.0000 for the flow
rate, and ‘R’ displaying signal strength and the signal quality Q (value) has a satisfactory value?
The problems are likely caused by the user who has used the ‘Set Zero’ function on this non-standstill
flowing pipe. To solve this problem, use the ‘Reset Zero’ function on menu window M43.
2. The displayed flow rate is much lower or much higher than the actual flow rate in the pipe under
normal working conditions.
(1) There is probably an offset value wrongly entered by the user in M44. Enter ‘0’ in M44.
(2) Problem with transducer installation.
(3) There is a ‘Zero Point’. Try to ‘zero’ the instrument by using M42 and make sure that the flow inside
the pipe should be standstill.
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