TSI Instruments AccuBalance 8370, Operation And Service Manual

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3
Introduction
The TSI Model 8370 A
CCU
B
ALANCE
is an instrument designed to
measure the air flow from diffusers and grilles or the air flow entering
exhaust outlets. The A
CCU
B
ALANCE
is lightweight and easy to use.
The instrument can display the measured air flow in three different
units: standard cubic feet per minute (SCFM), standard liters per
second (Std l/s) and standard cubic meters per hour (Std m3/hr).
The A
CCU
B
ALANCE
consists of a fabric hood, a molded plastic base
which contains an electronic meter, and a flow sensing manifold
located within the base. Air flowing through the hood is measured by
a hot-film sensor located in the central hub of the flow sensing
manifold. The twenty-four pairs of flow sensing ports in the manifold
are strategically located so that the A
CCU
B
ALANCE
provides the highest
degree of measurement accuracy, even in non-uniform flow
conditions.
The A
CCU
B
ALANCE
is temperature-compensated to display a standard
flow rate: SCFM, Std. l/s and Std. m3/hr. Standard flow rate is
defined as the volumetric flow rate at standard conditions of 70°F
(21.1°C) and 14.7 pounds per square inch (760 mmHg) barometric
pressure. Standard flow rate is the measurement used most often in
ventilation applications.
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