Series Mark II Molded Plastic Air Velocity Meter

Low in Cost – Direct Reading Scales Offer 3% Accuracy – For Portable or Stationary Applications

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. Scales are lithograph printed on aluminum and epoxy coated.

For stationary applications, the Mark II air velocity meters can be easily mounted on any vertical surface with the two screws provided. A built in spirit level simplifies leveling.

Just fill the reservoir, adjust fluid level to zero, connect the Pitot tube, and it is ready for operation. For portable applications, the Model A-612 portable stand is available for Models 27 and 28.

A molded plastic swing-out stand and leveling screw for user installation are provided with the Model 40-1-AV which also features rapid shutoff tubing connectors and built-in over pressure traps.

Additional standard accessories include plastic connection tubing, mounting screws, 3/4 oz. bottle of indicating fluid and instructions. Metric ranges are also available.

OEM Specials - All models of the Dwyer® Mark II molded plastic air velocity meters can be supplied with your logo or special scale in OEM quantities. Consult factory for details.

Product Applications

  • Measure air velocity in ducts

Models & Ordering

Model Description Usually Ships Price Order
MARK II 27
Ships: Same Day
Price: $51.50
Molded plastic manometer, range 0-7000 fpm, red oil, .826 sp. gr., requires Pitot tube *sold separately. Same Day $51.50 Order
MARK II 28
Ships: 1-2 Weeks
Price: $190.00
Molded plastic manometer, range 0-10,500 fpm, blue oil, 1.91 sp. gr., requires Pitot tube *sold separately. 1-2 Weeks $190.00 Order
MARK II 40-1-AV
Ships: 1-2 Weeks
Price: $77.50
Molded plastic manometer, range 0-1.1" w.c. & 0-4200 fpm, red oil, .826 sp. gr., requires Pitot tube sold separately. 1-2 Weeks $77.50 Order
MARK II 40-250PA-AV
Ships: 1-2 Weeks
Price: $77.50
Molded plastic manometer, range 0-260 Pa & 0-21 mps, red oil, .826 sp. gr., requires Pitot tube sold separately. 1-2 Weeks $77.50 Order
MARK II 41-2-AV
Ships: 1-2 Weeks
Price: $220.00
Molded plastic manometer, range 0-2.5" w.c. & 0-6300 fpm, blue oil, 1.91 sp. gr., requires Pitot tube sold separately. 1-2 Weeks $220.00 Order

Features

  • Thick white styrene-acrylonitrile housing is virtually indestructible
  • Moderate overpressures are accommodated by an overflow tank (Model 25) or float operated overflow traps (Model 40)
  • Able to be mounted on any vertical surface

Accessories

Model Number Description Usually Ships Price Order
Portable stand. A-612 Portable stand. Same Day $38.75 Order
1 oz dispenser bottle of red gage fluid, .826 sp. gr. A-101 1 oz dispenser bottle of red gage fluid, .826 sp. gr. Same Day $7.30 Order
4 oz bottle of red gage fluid, .826 sp. gr. A-102 4 oz bottle of red gage fluid, .826 sp. gr. Same Day $14.00 Order
1 pt bottle of red gage fluid, .826 sp. gr. A-103 1 pt bottle of red gage fluid, .826 sp. gr. Same Day $32.25 Order
1 qt bottle of red gage fluid, .826 sp. gr. A-104 1 qt bottle of red gage fluid, .826 sp. gr. Same Day $60.50 Order
1 oz dispenser bottle of blue gage fluid, 1.910 sp. gr. A-110 1 oz dispenser bottle of blue gage fluid, 1.910 sp. gr. Same Day $137.00 Order
1 pt bottle of blue gage fluid, 1.910 sp. gr. A-111 1 pt bottle of blue gage fluid, 1.910 sp. gr. Consult Factory $1,797.00 Order
Adapter, brass, 1/8 A-339 Adapter, brass, 1/8" NPT to 3/16" rubber and 1/8" ID plastic tubing. Same Day $4.00 Order
420706-00 Red pointer indicator. 1-2 Weeks $1.30 Order
420706-01 Green pointer indicator. 1-2 Weeks $1.30 Order

Approvals

Drawings

Questions

Question
Is routine maintenance required for a Dwyer red gage fluid type manometer?
Answer
Yes. The zero point should be checked periodically as well as the fluid level. After a year of service, particularly with dirty air, the fluid should be replaced to assure that specific gravity changes are not affecting the accuracy of the reading.
Question
What is the advantage of using a manometer rather than a Magnehelic® gage?
Answer
Dwyer Instruments manufactures many different types and styles of manometers with various accuracies and prices for different applications as well as the Magnehelic® gage. For example, some of the many manometers we manufacture are Hook Gage Manometers with ±0.001 inches water column accuracy; Microtector® Portable Electronic Point Gage to ±0.00025 inches water column accuracy; Handheld Digital Manometers with ±0.5 inches water column accuracy; very inexpensive Mark II Molded Plastic Air Filter Gages at ±3% inches water column accuracy. The key point is that we offer many manometers and the selection depends on your specification, application, convenience needs and pocketbook. Some of the key factors to consider that affect manometer performance and usage are: Characteristics of Indicating Fluid, Readability and Leveling. You should read "Measurement of Pressure with the Manometer" in our catalog to fully understand the importance of these factors and their effect on your reading with the manometer instrument. For many applications people prefer to use our Magnehelic® (dial style) gage with ±2% inches of water column accuracy because of convenience, accuracy, etc., plus when compared to a manometer, it eliminates indicating fluid, need for leveling, and some prefer the readability. If you consider manometers and Magnehelic® gages to measure low air or gas pressures ­ positive, negative, or differential, you have a wide selection to choose from and your application needs can be met with our very broad product line at a great value.
Question
Is there a manometer that is compatible with chlorine gas and sodium hydroxide (bleach)?
Answer
Unfortunately, we do not have any manometers available that can handle chlorine gas or sodium hydroxide (bleach).

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