26 Electronic Balancing Tool EBT720/EBT721 and ProHood PH720/PH721
Turn Back Pressure Compensation On and Off
Back pressure caused by flow through the capture hood can lower the flow being measured, causing
measurement error. If it is desired to minimize this error, turn the back pressure compensation on.
1. Press
to display CHANGE Test ID.
2. Press until SETUP appears.
3. Press
.
4. Press until BP.COMP appears.
5. Press
. The display shows whether back pressure compensation is on or off.
6. Press or to change the option. Options are: ON and OFF.
7. Press
. BP.COMP is displayed.
8. Press ESC to return to the main display.
Take Back Pressure Compensated Hood Readings
When back pressure compensation is turned on, the sequence of taking flow readings with the capture
hood is somewhat different.
1. Open the flap in the capture hood base.
2. Hold the capture hood to the diffuser being measured to capture its air flow.
3. Press READ on the meter face or the red “Read Switch” on the left side of the hood base. READ
OPEn flashes on the display.
4. When the open-flap reading is done, CLOSE tHE FLAP is displayed.
5. Close the flap and press READ (or the Read Switch). READ CLOSEd flashes on the display.
6. When the closed-flap reading is done, the backpressure compensated flow is displayed.
7. If you want to save the flow reading to log memory, press SAVE now. STORE is shown on the
display, then the saved reading is shown.
8. Before pressing any more buttons, open the flap.
9. If the display mode is set to SINGLE, pressing READ now will start a new backpressure
compensated reading.
If the display mode is set to RUNAVG, pressing READ now will measure and display a running
average of non-backpressure-compensated readings. Press READ once more to start a new
backpressure compensated reading.
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