TSI Incorporated 8372, Operation And Service Manual

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10 Chapter 1
on Model 8372, press the SUPPLY/RETURN key. Model 8373 will
automatically detect and indicate the direction of the flow.
Taking a Flow Measurement
You are now ready to start measuring flow rates. First, turn on the
A
CCU
B
ALANCE
Plus. For the Model 8372, select the appropriate flow
direction. For measuring supply air flow, the arrow must point down
away from the hood fabric; for return air flow measurements, the arrow
must point up toward the hood fabric. Model 8373 will automatically
sense the flow direction and it will be shown on the display.
Press the top of the A
CCU
B
ALANCE
Plus against the perimeter edge of
the diffuser or grille so as to form a seal.
The A
CCU
B
ALANCE
Plus will begin to display values on a continuous
basis. When you are ready to record a value press the
SAMPLE
key or
the button on the top of the right handle. The display will show the
word
“SAMPLE”
for the length of time as determined by the
TIME
CONSTANT
. When the sample is complete, the value will remain on
the display until
SAMPLE
is pressed again and the meter will return to
continuous measuring mode.
If the readings are fluctuating, increase the
TIME CONSTANT
to a
higher number. This is done by pressing and holding the
TIME
CONSTANT
key. Use the
▲
or
▼
key to adjust the
TIME CONSTANT
value. Press
ENTER
to resume measurement mode. The
A
CCU
B
ALANCE
Plus is shipped from the factory with the
TIME
CONSTANT
at 1 second.
When making a flow measurement, keep objects out of the flow path
at the base of the A
CCU
B
ALANCE
Plus (one foot clearance minimum).
However, it is acceptable to have a hand supporting the air capture
hood at the bottom of the base.
Notice : You must keep the A
CCU
B
ALANCE
Plus in place during the
entire sample interval and until the time-averaged measurement
appears on the display.
Turning the A
CCU
B
ALANCE
Plus Off
To turn off the A
CCU
B
ALANCE
Plus, simply press the
ON/OFF
key.