FDT-25W Wall Mounter Ultrasonic Flowmeter
25
4. How To
4.1 How to judge if the instrument works properly
Enter into M08, if ‘R’ is displayed on the screen, the instrument is working properly,
If 'E' is displayed, the current loop output is over-ranged. Increasing the range setting in M57 will make
the 'E' letter disappear. If you do not use current loop output, you may ignore this error.
If 'Q' is displayed, the frequency output is over-ranged. Increasing the range setting in M69 will make
the 'Q' letter disappear. If you do not use frequency output, you may ignore this error.
If an ‘H’ flashes on that place, there could be poor signal received. Please refer to the chapters on
diagnosis.
If 'G' is displayed, the flow meter is adjusting system gain. This is normal as far as it does not last long
time.
If an ‘I’ is displayed, it means that there is no signal detected.
If 'J' is displayed, there is hardware problem. Turn off the power, then, turn on
the power again. If the problem remains, refer to Chapter 5 for diagnosis details.
4.2 How to judge the liquid flowing direction
(1) Make sure that the instrument works properly
(2) Check the flow rate for the indication. If the displayed value is POSITIVE, the direction of the flow
will be from the A transducers to the B transducers; if the displayed value is NEGATIVE, the
direction will be from the B transducers to the A transducers;
4.3 How to change between units systems
Use menu window M30 for the selection of unit system in English or Metric system.
4.4 How to select a required flow rate unit
Use menu window M31 to select the flow unit first and then the timing unit.