TSI Instruments AccuBalance 8370, Operation And Service Manual

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16 Chapter 1
averaging time of six seconds by changing the setting of DIP Switch 6.
See
Changing DIP Switch Settings in Chapter 2. For more details on the
averaging mode, see Chapter 2.
Selecting Flow Direction
Each A
CCU
B
ALANCE
is calibrated for supply and return air separately
for increased accuracy. The A
CCU
B
ALANCE
will assume that air is
flowing in the same direction as the arrow on the right-hand side of
the display. Be sure this arrow points in the direction of flow through
the A
CCU
B
ALANCE
, otherwise measurements will be inaccurate. To
change the direction of the arrow, press the
RETURN/SUPPLY
switch.
Taking a Flow Measurement
You are now ready to start measuring flow rates. First, turn on the
A
CCU
B
ALANCE
and 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.
Next, choose the Continuous Reading Mode and be sure that the
"
HOLD
" message is not on the display. If the "
HOLD
" message is on the
display, press either the
START/HOLD
switch on the keypad or the
button on the right handle to resume readings.
Finally, press the top of the A
CCU
B
ALANCE
against the perimeter edge
of the diffuser or grille so as to form a seal. The electronic meter will
display standard flow readings.
If the readings are fluctuating, choose the averaging mode by pressing
the
AVG/CONT
switch on the keypad. In the Averaging Mode, it is
important to keep the A
CCU
B
ALANCE
in place over the diffuser or grille
during the countdown and until the average reading appears on the