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Idiomas disponibles
Idiomas disponibles
APPLICATIONS
AIR FILTER GAGE
Mount gage within 3 ft. of filter bank. Install
tubing adapters on each side of filter. Run
tubing from clean side of filter to positive
pressure side of gage (left fitting). Run
downstream side to low pressure side of
gage (right fitting). Install green and red
arrows adjacent to indicating tube to indi-
cate filter condition.
AIR VELOCITY METER
A pitot tube should be used for air velocity
readings. Install the pitot tube and gage
carefully to ensure accuracy. Select a loca-
tion for the pitot tube with al least four diam-
eters of smooth straight sections of duct
both upstream and downstream. Install
pitot tube in the center of duct with tip
directed into air stream. Connect the right
angle (leg parallel to tip) to negative (right fit-
ting) and straight pitot tube connection to
positive (left connection) of gage. The veloc-
ity reading shown on the gage is the center
or maximum velocity. For average velocity
across the full area, multiply by a factor of
0.9.
©Copyright 2004 Dwyer Instruments, Inc.
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A.
MARK II MANOMETER
PITOT TUBE SENSES TOTAL AND STATIC PRESSURES. MANOMETER
MEASURES VELOCITY PRESSURE-(DIFFERENCE BETWEEN TOTAL AND
STATIC PRESSURES).
No's. 27 and 28 require pitot tube at addi-
tional cost. See Bulletin F-41-F.
The velocity indicated is for dry air at 70°F,
29.9˝ barometric pressure and a resulting
density of 0.075 lb/ft
these standard conditions, corrections may
be based upon the following data.
AIR VELOCITY CALCULATIONS:
Air Velocity = 1096.2
where Pv = velocity pressure in inches of
D = Air density in lb/ft
Air Density = 1.325 x
where P
= Barometric Pressure in inches
B
T = Absolute Temperature (indicat-
Flow in cu. ft. per min. = Duct area in square
feet x air velocity in ft. per min.
Printed in U.S.A. 1/04
Phone: 219/879-8000
Fax: 219/872-9057
Pt
Ps
FLOW
3
. For variation from
Pv
√
D
water
3
P
B
T
of mercury
ed temperature °F plus 460)
FR# 67-440215-00 Rev. 11
www.dwyer-inst.com
e-mail: info@dwyer-inst.com
PITOT TUBE
(SECTION
ENLARGED
TO SHOW
DETAIL)
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