Dwyer Series 250/451 Inclined
Manometer Air Filter Gages
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| Precision Machined, Solid Acrylic
Plastic Gages, Accurate to ±1%
of Full Scale |
|
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.
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 |
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| Model No. 250.5-AF |
Economy Model No. 451-AF |
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| 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.
Gage shall be Dwyer Instruments, Inc. Catalog No. ____, reading to
__in. divisions. |
| ACCESSORIES |
 |
 |
| Standard accessories furnished are two static
pressure tips with integral compression fittings and two five
foot lengths of 1/4" aluminum tubing plus two compression fittings,
mounting hardware and extra bottle of gage oil. |
A-310B 3 way vent valve |
| A-317 Plastic Gage plug |
| Optional vent valves for easy zeroing
of gage are available at extra cost. Two are required per gage. |
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| 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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| Popular Series 250 Models: |
| Model
Number |
Range
- Water Column |
Minor
Divisions |
Inclined
Scale Length - Inches |
Overall
Size - Inches |
| 250-AF |
.10-0-1.0" |
.02" |
5-1/2 |
8-1/2 x 4-1/8 x 1 |
| 250.5-AF |
.10-0-1.0" |
.01" |
8 |
11-3/8 x 4 x 1 |
| 251-AF |
.05-0-.50" |
.01" |
5-1/2 |
8-1/4 x 3-3/8 x 1 |
| 252-AF |
.20-0-2.0" |
.02" |
8 |
11-1/8 x 6-1/2 x 1 |
| 209-AF |
.20-0-3.0" |
.02" |
8 |
11-1/4 x 6-7/8 x 1 |
| 260-AF |
0-1.5" |
.02" |
5-1/2 |
8-3/8 x 5-7/8 x 1 |
| 350-AF² |
0-4" |
.10" |
4-1/2 |
3 x 8-1/4 x 1 |
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|
|
| Popular Series 450 Models: |
| Model
Number |
Range
- Water Column |
Minor
Divisions |
Inclined
Scale Length - Inches |
Overall
Size - Inches |
| 451-AF¹ |
0-1" |
.01" |
8 |
11 x
2-1/2 x 5/8 |
| 452-AF¹ |
0-2" |
.02" |
8 |
11 x
4 x 5/8 |
|
|
|
¹2 psi maximum working pressure
² Vertical scale |
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