Thermo Scientific TVA2020 Instruction Manual page 136

Servicing
Flow Calibration
7-18 TVA2020 Instruction Manual
5. Attach one of the red flow restrictors between the probe inlet and the
flow meter.
6. Press "2" for the second flow calibration point.
7. Adjust the pump power with the up and down arrows for a reading of 1
±.01 LPM at the probe inlet.
a. Typical values are 65-75% power with 1K-3K higher counts
8. Press Enter=Accept to save the Flow 2 values
9. Attach a second red flow restrictor, in line with the first, between the
probe inlet and flow meter.
10. Press "3" for the third flow calibration point.
11. Adjust the pump power with the up and down arrows for a reading of 1
±.01 LPM at the probe inlet.
a. Typical values are 85-95% power with 1K-3K higher counts.
12. Press Enter=Accept to save the Flow 3 values.
13. Press 4= calc coef to calculate the flow calibration values.
Note The flow calibration values are stored in a file called
FACTORY.TXT. This file can be saved to a computer and reloaded to the
instrument if the flow calibration were to become corrupted. See the
section on flash file transfers. ▲
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