Dynasonics TFXM Series Ultrasonic Multi-Channel Flow Meter - Manual (Page 77)

Rev. 8/02 -4. 10- TFXM
Setting Zero and Calibration
UltraLink contains a powerful multi-point calibration routine that
can be used to calibrate the TFXM flow meter to a primary
measuring standard in a particular installation. To initialize the
three step calibration routine, press the Calibration button located
on the top of the UltraLink Data Screen. The display shown in
Figure 4.8 will appear. The first step in the calibration process is
the selection of the engineering units that the calibration will be
performed with. Select the units and press the Next button at the
bottom of the window.
The second screen, Figure 4.9 , establishes a baseline zero flow
rate measurement for the instrument. To zero the flow meter,
establish zero flow in the pipe (turn off all pumps and close a
dead-heading valve). Wait until the delta-time interval shown in
Figure 4.9 is stable (and typically very close to zero). Press the
Set button. Press the Next button when complete, then press the
Finish button on the Calibration Screen. If the Set button was
pressed, do not proceed with Flow Rate Calibration before
pressing the Finish button to save the Zero setting.
SOFTWARE UTILITIES
Figure 4.8
Calibration Units
Field Calibration
Establish Zero
Flow Rate