K-Factor Volume Flow Application; [K-Factor Volume Flow] - TESTO 440 Instruction Manual

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4 Operation
- Straight Pitot tubes (0635 2043, 0635 2143, 0635 2243): Pitot tube
factor: 0.67
- Air flow velocity matrix (0699 7077): Pitot tube factor: 0.82
For Pitot tubes from other manufacturers, refer to the instruction
manual for the Pitot tube factor or ask your supplier.
In a multi-point measurement, a mean value is calculated from the
individual measuring values.
In a timed average measurement, a mean value is calculated over a
certain period.
Several points can be measured. This generates a timed
average/multi-point total mean value.
2
Use to select the required parameter and make settings.
3
Press or to exit the menu.
Carrying out the measurement
A suitable probe is connected to the measuring instrument.

1 Define the channel parameters in the application menu.
Observe the minimum clearances to points of discontinuity:
- From points of discontinuity upstream of the flow, observe a
clearance of at least six times the hydraulic diameter Dh = 4A/U (A:
channel cross-section, U: channel circumference).
- From points of discontinuity downstream of the flow, observe a
clearance of at least twice the hydraulic diameter Dh = 4A/U (A:
channel cross-section, U: channel circumference).
2 Insert the Pitot tube in the channel.
3 Carry out the measurement and save the measuring values.

4.5.8 K-factor volume flow application

Volume Flow]
The testo 440 can determine the volume flow by measuring the reference
resistance and input of the K-factor. This allows the testo 440 to remain
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