TESTO 440, Инструкция по эксплуатации

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3 Operation
35
3 Carry out the measurement and save the measuring values.
3.5.8 K-factor volume flow application [K-Factor
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
connected to the air outlet during adjustment work and the changes in volume
flow can be read directly on the display.
The application menu can only be accessed with testo 440 dP or used
in combination with a testo 510i with Bluetooth
®
.
This process for determining volume flow can always be used when there are
appropriate specifications available from the component manufacturer. In line
with these specifications, the differential pressure is measured at a position
specified by the manufacturer or supplier. The volume flow is determined from
the differential pressure via a component-specific K-factor using a
mathematical equation.
Preparing for measurement
1 First select the K-Factor Volume Flow Application.
You can make the following settings:
- Measuring Type: multi-point/timed avg.
- K-Factor: from 0.01 to 999.99
- Unit k-Factor: Pa, kPa, hPa, mbar, psi, mmH
2
O, mmHg, inH
2
O,
inHg, Torr
- Volume Flow Unit: m
3
/h, cfm, l/s, m
3
/s