Download TFXB Manual - Flow Meter Rentals

SETTING ZERO AND CALIBRATION
Calibration
The software utility contains a powerful multi-point calibration routine that can be used to
calibrate the DTFX Ultra flow meter to a primary measuring standard in a particular installation. To initialize the three-step calibration routine, click on the Calibration button located
on the top of the Data Screen. The display shown in Figure 5.8 will appear.
Calibration (Page 1 of 3) - Zero Flow
1. Make sure flow is at zero.
2. Wait for flow to stabilize.
3. Press <Set> to calibrate the zero offset.
Current Delta T:
File Open...
File Save...
-0.43
Set --
-0.88
<Back
Next>
Cancel
FIGURE 5.8 - CALIBRATION PAGE 1 OF 3
The first screen (Page 1 of 3) , establishes a baseline zero flow rate measurement for the instrument.
Because every flow meter installation is slightly different and sound waves can travel in slightly different
ways through these various installations, it is important to remove the zero offset at zero flow to maintain the meters accuracy. A provision is made using this entry to establish “Zero” flow and eliminate the
offset.
To zero the flow meter:
1) Establish zero flow in the pipe (ensure that the pipe is full of fluid, turn off all pumps, and close a
dead-heading valve). Wait until the delta-time interval shown in “Current Delta T” is stable (and
typically very close to zero).
2) Click the Set button.
3) Click the Next button when prompted, then click the Finish button on the calibration screen.
06-TTM-UM-00006 10/2011
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