10 Electronic Balancing Tool EBT720/EBT721 and ProHood PH720/PH721
The handle assembly is attached to the downstream or negative (-) side in the center of the velocity matrix
(see Figure 9).
Figure 9: Velocity Matrix
Connecting the Air Flow Probe to the Micromanometer
The static pressure port (-) on the Air Flow Probe will be connected to the negative pressure (-) port on
the micromanometer, and the total pressure port (+) on the Air Flow Probe will be connected to the
positive (+) port on the micromanometer (see Figure 10).
Note: Observe the arrow indicator on the Air Flow Probe when taking air velocity or air volume
measurements.
Figure 10: Air Flow Probe
Connecting the Temperature Probe or Temperature and Humidity
Probe to the Micromanometer
The Temperature probe and Temperature/Humidity probe attach to the 8-pin connector located on the
right hand side of the micromanometer. When connecting the probe to the meter, the dimple on the
connector must be aligned to fit the receptacle indentation on the meter (see Figure 11).
Positive
Port (+)
Negative
Port (–)
Standoffs
Handle
Total Pressure Port (+)
Static Pressure Port (–)
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