Alnor Balometer ABT701 - Chapter 1. Introduction

Chapter 1. Introduction
The Alnor
®
Analog Balancing Tool (ABT) Balometer
®
capture hood Models ABT701, ABT703, ABT711, and
ABT713 are productivity instruments designed to quickly measure the air flow directly from supply diffusers
and return/exhaust grilles mounted in a ceiling, wall or floor with equal accuracy. The ABT consists of:
• fabric hood
• hood frame
• support rods
• molded plastic base (which contains the meter and a flow sensing manifold).
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 ABT
provides a high degree of measurement accuracy, even in non-uniform flow conditions.
The ABT Models are temperature-compensated to display a standard flow rate in CFM (ft
3
/min.) or
CMH (m
3
/hr) depending on the model ordered. Standard flow rate is defined as the volumetric flow rate at
standard conditions of 70°F (21.1°C) and 29.92 inHg (760 mm Hg) barometric pressure.
For increased flexibility, additional hood sizes are available to fit interchangeably on the instrument base.
These additional hoods are used with frame pieces which must be assembled by the user. Instructions for
assembly can be found in this manual (see Chapter 2, “Hood Setup” and Chapter 4, “Hood Assembly
”) for the
following sizes:
• 1 ft × 4 ft (305 mm × 1220 mm)
• 2 ft × 4 ft (610 mm × 1220 mm)
• 3 ft × 3 ft (915 mm × 915 mm)
• 1 ft × 5 ft (305 mm ×1525 mm)
• 16 in × 16 in (406 mm × 406 mm).
CAUTION
The ABT Balometer
®
capture hood is not designed for gas mixtures other than
air. Any use with corrosive or other dangerous or explosive gas mixtures is not
recommended, and is at the user’s risk.
CAUTION
W
HILE USING THE
B
ALOMETER
®
AIR BALANCING INSTRUMENT TO TEST AIR FLOW IN
DUCTS
, YOU MAY COME INTO CONTACT WITH OR BE EXPOSED TO DUST, POLLEN, MOLD,
FUNGUS
, OR OTHER AIRBORNE CONTAMINANTS. IF YOU ARE OR MAY BE SENSITIVE TO
DUST
, POLLEN, MOLD, FUNGUS, OR OTHER AIRBORNE CONTAMINANTS, ALWAYS USE AN
APPROPRIATE MASK OR RESPIRATOR WHILE EMPLOYING THE
BALOMETER
®
AIR
BALANCING INSTRUMENT.
7