Alnor Airflow Proood PH730, Owner'S Manual, Page: 18 / 80

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Airflow™ Instruments ProHood Capture Hoods PH730/PH731
C A U T I O N
The percent power remaining will not be accurate for NiMH batteries because their voltage does not
decrease linearly with power use.
Due to the danger of battery leakage, remove batteries from the battery compartment before storage.
Never mix battery types.
The NiMH batteries should only be charged at room temperature. Starting with batteries that are too
cold or too warm can cause the charge cycle to stop early.
Using the Pressure Ports
The differential pressure ports are used to connect the micromanometer to various pressure based tools
including the ProHood Capture hood, Pitot tubes, Air Flow probe (straight pitot probe), Velocity Matrix and
static pressure probes. Tubing is used to connect the ports on the micromanometer to the probes.
Positive (+)
Pressure Port
Negative (
–)
Pressure Port
Figure 7. Pressure Ports
Connecting a Pitot Tube
When the micromanometer is connected to a pitot tube, air velocity or air volume measurements can be
taken. The pitot tube is connected to the (+) and (
–) pressure ports on the micromanometer using two
pieces of tubing of equal length. The total pressure port of the probe connects to the (+) port on the
meter, and the static pressure port of the probe connects to the (
–) port on the meter.
Total Pressure
Port (+)
Static Pressure
Port (
–)
Figure 8: Pitot Tube