Dwyer® Durablock® Series 250-AF Gages are
precision machined 1" thick solid acrylic plastic, virtually
unbreakable and free of distortion. The fluid bore is precision
drilled to ±.0002" to assure life long accuracy. A glass
spirit level is built into the body and encapsulated to
prevent damage or tampering. The scale is mirror polished
chrome plated brass to assure parallax free reading by alignment
of the miniscus with its reflection. Safety traps are incorporated
in the body to prevent loss of fluid due to pressure surges.
Red and green signal flags indicate clearly when a filter
change is necessary. Gages are suitable for use in ambient
temperatures of -20 to 150°F. Connection fittings are positively
sealed by "O" rings but easily removed for zeroing or addition
of fluid. Furnished complete with instructions.
Economy Models 451-AF and 452-AF are similar
to 250 Series except they are not equipped with over pressure
traps. Two A-324 1/4" compression fittings are included
with each Gage but not shown. Bodies are of 5/8" thick acrylic
and scales are mirror polished, epoxy coated aluminum.
SUGGESTED
SPECIFICATION
for Architects and Engineers
An air filter gage for measuring the resistance
to air flow through the filters shall be installed, one
for each bank of filters. The gage shall be of inclined
tube differential type (equipped with vent valves for zeroing)
shall be of solid acrylic plastic construction with built-in
level vial (and over pressure safety traps 250 Series only),
shall have an adjustable mirror-polished scale, shall be
furnished complete with two 5-foot lengths 1/4" tubing,
two static pressure tips, mounting hardware, additional
bottle of red gage oil and instructions.
FEATURES
Highly accurate and easy to use yet almost
indestructible, Dwyer® Series 250-AF
Inclined Air Filter Gages are foolproof and dependable.
There are no moving parts - no mechanical linkages - nothing
to wear out, jam or deteriorate from vibration. They never
need calibration. The mirror polished inclined scale allows
the operator to easily read minute differences in differential
pressure across the filter accurately without parallax error.
The only servicing required is occasional
zeroing. If cleaning is necessary, it is easily done with
soap and water.
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