It is necessary to establish the true zero flow condition and program that set point into the instrument. If the zero set point is not at true zero flow, a measurement difference may occur. Because every flow meter installation is slightly different and sound waves can travel in slightly different ways through these various installations, a provision is made in this entry to establish “True Zero” flow – SETUP ZERO.
There exists a ‘Zero Point’ with certain installation which means the flow meter will display a non-zero value when the flow is absolutely stopped. In this case, setting a zero point with the function in window M42 will bring a more accurate measurement result.
When do a calibration test, it is also very important. Make sure that the pipe is full of liquid and the flow is absolutely stopped – securely close any valves and allow time for any settling to occur. Then run the function in window M42 by press the MENU 4 2 keys, then press ENTER key and wait until the counter readings displayed in the lower right corner of the screen goes to “00”; thus, the zero set is completed and the instrument indicates the results automatically through Window No.01.
Repeat zero set calibration if it still needs to be minimized, i.e. the velocity reading is still high.
Post time: Oct-14-2022