Dwyer 100 - Manual (Page 2)

Small and portable ...
To determine cooling capacity of air conditioning systems, the
American Society of Refrigeration Engineers requires that air
volume be established by measuring static pressure differential
across a calibrated test orifice with an elliptic curve approach.
This laboratory test is highly accurate, but impractical for field
use because of the large, cumbersome equipment involved. The
Dwyer
® Air Volume Gage static pressure sensors offers a
positive solution to this problem. This compact gage combines
laboratory accuracy, field-use versatility and ease of operation.
Saves time, saves work ...
Leading cooling equipment manufacturers furnish coil
performance data showing the static pressure differential across
each coil along with the equivalent volume flow and peak cooling
point. This data is determined in laboratory hot rooms with air
flow accurately measured by ASRE standard methods.
Recommended static pressure differentials usually run between
.10˝ and .20˝ water column (.2482 mbar and .4964 mbar).
Maximum cooling capacity is usually found in the range of 400
c.f.m. (11,326.4 LPM) for each 12,000 b.t.u. of cooling. Using the
Dwyer
® Air Volume Gage static pressure sensors, the air
conditioning engineer or installer can accurately measure air
pressure differential across a cooling coil. With this information,
the user may determine air volume flow from the manufacturer’s
data, thus bringing laboratory accuracy into the field.
Adjustments in blower speed can then be made to exactly
duplicate the manufacturer’s recommended operating point.
Conditions which would lead to mechanical failure are avoided
and peak performance is assured.
©Copyright 2013 Dwyer Instruments, Inc. Printed in U.S.A. 5/13 FR# 31-440246-00 Rev. 7
MAGNECLIPS
TYPICAL HI-BOY FURNACE
WITH COOLING COIL IN PLENUM
This valuable accessory, furnished as standard equipment with
each Dwyer
® portable air volume gage, allows rapid positioning
of the gage on any vertical iron or steel surface. Just touch the
Magneclip-equipped gage to the side of the duct, plenum or
other convenient surface. It grips instantly and securely, freeing
hands for other work.
DWYER INSTRUMENTS, INC.
Phone: 219/879-8000 www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: 219/872-9057 e-mail: [email protected]