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Durablock®
Solid Plastic Portable Gages |
 No. 100.5 solid plastic portable gage with .10-0-1.0" W.C. range. Shown with carrying case and standard accessories. Catalog Page |
 No. 170 solid plastic gage shown on stand provided for all Dwyer portable inclined gages. Magnetic clips are also furnished to permit easy mounting on any vertical steel surface. |
 No. 104 solid plastic portable vertical manometer shown attached to inside of carrying case cover. Gage may also be removed from case and used in standing position or attached to any vertical steel surface with magnetic clips provided. |
| Dwyer solid plastic portable manometers are
precision instruments in inclined and vertical (well-type) styles for
the measurement of static pressure, vacuum or differential pressure. To
assure the accuracy required in instruments of this type, all machining
of bores and wells is to the highest standards of precision backed by
Dwyer's years of experience in the fabrication of acrylic instruments.
Ranges And Dimensions INCLINED TYPE
STANDARD ACCESSORIES Plastic or Steel Carrying Case (plastic pouch for 170, 171 and 172), two magnetic mounting clips, two rapid shut-off nylon tubing connections, one 9' length rubber tubing, terminal tube and extra bottle .826 red gage oil. A-396A Calibration Pump - Use as a pressure source to calibrate gages, set switches, etc. Has volume adjuster, bleed valve and fine adjustment for pressures up to 72 psi (5 bar). Accessories include barbed fitting, tee connector, three 36 in. lengths of vinyl tubing and instructions. |
 A-396A |
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Durablock® Solid Plastic
Stationary Gages |
Dwyer solid plastic stationary gages - or draft gages - are offered in inclined and vertical (well-type) styles for highly accurate laboratory or general industrial service, for measurement of low range gas and air pressures, positive, negative or differential. To assure the accuracy required in instruments of this type, all machining of bores and wells is to the highest standards of precision backed by Dwyer's years of experience in the fabrications of acrylic instruments.
 DESIGN AND SERVICE FEATURES
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Kits For Air Filter Gage Service
 Dwyer solid plastic gages and other gages are available in kits especially developed for air filter gage service. They include the gage, two static pressure tips with integral compression fittings ad two 5 foot lengths of ¼" aluminum tubing. The static pressure tips are installed in the duct upstream and downstream of the filter and connected to the gage to provide a continuous visual indication of the static pressure drop across the filter. When the filter's resistance in terms of static pressure drop reaches the maximum specified by the filter manufacturer, it is an indication that the filter should be cleaned or replaced. For complete details on Dwyer Air Filter Gage kits, refer to Pressure Section, Air Filter Gages and Switches. |
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Ranges
and Dimensions Suitable for total pressures up to 100 psig, temperatures up to 150°F.Accuracy ±2% of full scale (1% on models 215, 244, 246 only) |
INCLINED TYPE
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VERTICAL OR WELL-TYPE
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STANDARD ACCESSORIES:
One extra bottle of .825 red gage oil, instructions and one set of type
"a" connections, described below, unless other connection option is
specified.
A-396A Calibration Pump - Use as a pressure source to calibrate gages,
set switches, etc. Has volume adjuster, bleed valve and fine adjustment for
pressures up to 72 psi (5 bar). Accessories include barbed fitting, tee
connector, three 36 in. lengths of vinyl tubing and instructions.
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Over-Pressure Safety Traps Prevent Fluid Loss
Connection Options For Dwyer Solid Plastic Stationary Gages
If so specified on the order, Dwyer solid plastic stationary gages will be furnished with your choice of the following connections options: Type "b": Two molded nylon tubing connectors,
rapid shutoff type, one 9' length rubber tubing, and one brass terminal
tube. |
Fig. 7-3. Exclusive Dwyer over pressure safety traps assure that over
range pressures whether gradual or a sudden surge will not force the
liquid out of the gage. Over pressures simply float the cork, force the
O-ring over the opening and seal the fluid in the gage. When pressure is
reduced, cork drops down releasing the O-ring to open trap and gage
continues in operation.
Unless otherwise specified, Dwyer solid plastic stationary gages will be
furnished with type "a" connections consisting of two rapid
shutoff type, molded nylon tubing connectors (see Fig. 5-3, page 21),
two 3 ft. lengths flexible Tygon plastic tubing, and two 1/8"
pipe thread adapters.STOCKED
MODELS
| Model Number |
Range, Inches of Water | Minor Scale Divisions | Scale length inches | Weight lbs-oz. | Price |
| 200 | .10-0-1.0 | .02 | 5 1/2 | 2-14 | $250.00 |
| 200.5 | .10-0-1.0 | .01 | 8 1/4 | 3-11 | $203.00 |
| 201 | .05-0-.50 | .01 | 5 1/2 | 2-12 | $239.00 |
| 202 | .20-0-2.0 | .02 | 8 1/4 | 4-5 | $239.00 |
| 202.5 | .20-0-2.0 | .01 | 8 3/4 | 4-7 | $239.00 |
| 209 | .20-0-3.0 | .02 | 8 3/4 | 4-11 | $238.00 |
| 215 | .05-0-.25 | .005 | 6 | 2-14 | $208.00 |
| 244 | 0-4 | .02 | 13 1/4 | 9-11 | $310.00 |
| 246 | 0-6 | .02 | 20 | 13-14 | $354.00 |
| Model Number |
Range, Inches of Water | Minor Scale Divisions | Scale length inches | Weight lbs-oz. | Price |
| 300 | 0-4 | .10 | 4 1/2 | 2-5 | $141.50 |
| 306 | 0-6 | .10 | 7 3/4 | 3-3 | $151.00 |
| 308 | 0-8 | .10 | 9 | 3-7 | $174.00 |
| 310 | 0-10 | .10 | 11 1/8 | 3-10 | $176.00 |
ACCESSORIES
| Model Number |
Description | Price |
| A-396A | Calibration Pump | $244.00 |
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250-AF
Series Inclined Manometer Air Filter Gages Precision Machined, Solid Acrylic Plastic Gages, Accurate To ±1% Of Full Scale |
 Economy Model 451-AF |
| 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. SUGGESTED SPECIFICATION |
CONSTRUCTION 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.
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STANDARD ACCESSORIES AND OPTIONS
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 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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Economy Models 451-AF and 452-AF are similar to 250 Series except they
are not equipped with over pressure traps. Two A324 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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Durablock Inclined-Vertical
Manometers Series 424 — Accuracy To ±1/4 Of 1% |
 No. 424-10 Inclined-Vertical Manometers, 0-10" water range. The inset shows a segment of the inclined scale in actual size. No. 424-5, 0-5" water range is similar. |
 Dimensional Enlargement |
 Series 420 Service Manual Catalog Page |
Typical of Series 420
Inclined-Vertical Manometers is this No. 422-10 double column manometer
with a total range of 0 to 10" of water. Single column models are
also furnished. Design features are essentially the same as for the
Series 424. They are accurate to ±1% and are particularly suited for
use with pitot tubes and in flow measurement or similar applications. |
| Dwyer No. 424 inclined-vertical manometer are
extremely accurate instruments designed and made especially for
precision measurement of low differential pressures in laboratory and
test applications. The inclined range bore has a length of 20" to
provide ample multiplication of indicating fluid movement in this
critical lower part of the range.
STANDARD ACCESSORIES Dimensions
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FEATURES OF THE MODEL 424 • 1-1/4" THICK ACRYLIC PLASTIC BODY is a solid block, virtually unbreakable, stable and absolutely free of the danger of distortion. • 3/16" BORES, ACCURATE TO ± .0002" are permanently free of bends or crooks, will not require recalibration because of distortion. • GROUND GLASS BUBBLE LEVEL sensitive to 115-125 sec./2 mm. is 1-1/2" long x .375" diameter and provided with two red lines for easy visibility and alignment. • PARALLAX-FREE READING for maximum accuracy and consistency is achieved by simply aligning the meniscus with its image reflected in the polished aluminum scale. • SELECTED GAGE OIL with high wetability characteristics forms a consistent, well shaped meniscus for perfect readability. • O-RING SEALED FLUID LEVEL PLUNGER ADJUSTMENT for easy zeroing. |
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| Model Number |
Inclined Range Inches of Water | Inclined Minor Div. | Length of Inclined Scale | Vertical Range Inches of Water | Vertical Minor Div. | Length of Vertical Scale | Weight lbs.-ozs. |
| 422-5 | 0-1.0 | .01 | 6 1/2" | 1.1-5 | .10 | 4 5/8" | 6-10 |
| 422-10 | 0-1.0 | .01 | 6 1/2" | 1.1-10 | .10 | 10 1/8" | 10-13 |
| 422-23 | 0-2.2 | .02 | 6 1/8" | 2.4-23.0 | .20 | 10 1/4" | 10-12 |
| Model Number |
Inclined Range Inches of Water | Inclined Minor Div. | Length of Inclined Scale | Vertical Range Inches of Water | Vertical Minor Div. | Length of Vertical Scale | Weight lbs.-ozs. | Price |
| 424-250MM | 0-50MM | .2MM | 19 5/8" | 52-250MM | 2.0MM | 8 7/8" | 22-12 | $553.00 |
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Mark II Molded
Plastic Air Filter Gages Compact, Economy Priced Molded Plastic Gages Accurate to ±3% of Full Scale |
 Service Manual Catalog Page |
 Dimensional Enlargement  Dimensional Enlargement |
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Dwyer Mark II molded air filter gages are of the inclined and
inclined-vertical types. The curved inclined-vertical tube of the Model
25 gage provides higher ranges with more easily read increments at low
readings. The Model 40 inclined gage provides linear calibration and
excellent resolution throughout its range. When ordered with the Model
A-606 AF Kit the Model 40 is ideally suited for stationary air filter
gage applications. The Model 25 is excellent for general purpose work
and for higher anticipated filter resistances. Both gages are capable of
measurements above and below atmospheric as well as differential
pressure measurements.
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Construction Mark II air filter gages are economically priced, compact and available in both stationary and portable configurations. Portable stand is standard on Model 40, available as optional A-612 stand for Model 25. Construction is simple with virtually indestructible molded white styrene acrylonitrile housing, indicating tube and fluid wells, molded ABS knobs and zero adjust plunger, shock mounted glass level vial and leak proof "O" ring seals. Moderate overpressures are accommodated by an overflow tank incorporated in the Model 25. Greater protection is provided by float operated overflow traps in the Model 40. Scales are lithograph printed on aluminum and epoxy coated. Installation For normal stationary installations, simply mount the gage on any vertical surface with the two mounting screws provided. A built-in spirit level simplifies leveling before mounting screws are tightened. Fill the reservoir, adjust fluid level to zero, connect the tubing, and the gage is ready for operation. Accessories Included with each Mark II air filter gage are two tubing connectors for 1/8" pipe or sheet metal ducts, two mounting screws, 3/4 oz. bottle of indicating fluid, red and green pointer flags and complete instructions. The Model 25 includes 8' of flexible double column plastic tubing. The Model 40 includes two 4-1/2' lengths of clear plastic tubing and is equipped with rapid shut-off connectors. The optional Model A-606 AF Kit (for use with the Model 40 only) contains two static pressure tips with integral compression fittings, two 5' lengths of aluminum tubing and two slip-fit gage compression fittings which can be easily removed to zero the gage. |
NO.
400 AIR VELOCITY METER KIT |
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 Catalog Page |
Dual scale inclined-vertical
manometer reads in feet per minute from 500 FPM and inches of water with
0.01" W.C. minor divisions. Complete kit includes red gage oil,
pitot tube, tubing and air velocity calculator. Click for more details |
| NO.
102-AV and No. 115-AV AIR VELOCITY KITS |
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Complete kits include solid
plastic gages No. 102 or No. 115 with dual scales in feet per minute and
inches of water and all accessories necessary for measurement of air
velocity. |
| SERIES
VT - 170 AIR VOLUME GAGE KITS |
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Complete kits for use in
determining air volume includes 170 solid plastic gage, red gage oil,
tubing, flowsensor, insertion probes, connection accessories and case.
No. VT- 170, No. VT-171 and No. VT-172.
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Series 400 |
Air Velocity Meters |
 Catalog Page |
| Measure both pressure and
air velocity
Read the red figures directly in feet per minute of velocity - from 400 to 10,000 f.p.m. No conversion tables needed for air at standard conditions. Read the black figures in inches of water column air pressure - from 0 to 10" w.c. Our most popular precision air velocity instrument, the No. 400 is used to balance air conditioning systems, measure pressure drop across filters, and test fan and blower discharge and inlet pressures, as well as air velocity in ducts. It offers the convenience of a dual purpose instrument - plus high accuracy on easy-to-read scales. A versatile, all around manometer for the air conditioning and balancing contractor or industrial plant. POPULAR
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Kit includes No. 400 Air Meter and all accessories: Accessories: Rubber Tubing with Connectors - Two coils of 3/16" with metal terminal tubes. Magneclip side mountings. Attach meter instantly to steel duct or surface. Red Gage Oil - Spare bottle. For occasional refilling. Supply sufficient for several years of normal use. (Blue Gage Oil furnished with Model 400-23). Instruction Card - Easy to read and understand. Plastic laminated, wipes clean. Dwyer Air Velocity Calculator - Slide rule eliminates tedious calculations - easily compensates for temperature, humidity and barometric pressure variations. Steel Carrying Case - Professional quality. Welded seams, enamel finish. Hinged top locks with hasps. Foam plastic lined and fitted to protect meter and accessories. Size* 11½H x 20¼W x 1½D". Only 13 ¼ lbs. with equipment. *No. 400-5-S is 11 x 11½ x 2½". Contact factory
for extra long steel cases for use with longer Pitot tubes.
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