Product Overview
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26
Pressure
Mark II Model No. 40-1 inclined manometer
Mark II Molded Plastic Manometers
3% Accuracy For Stationary And Portable Applications At Minimum Cost
Dwyer
®
Mark II series molded manometers 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 25 is excellent for general pur-
pose work. The Model 40 inclined gage provides linear calibration and excellent reso-
lution throughout its range. The Model 40 is ideally suited for air velocity and air fil-
ter gage applications. Both gage types are capable of pressure measurements above
and below atmospheric as well as differential pressure measurements.
Construction — Mark II manometers are economically priced, compact and
available in both stationary and portable configurations. Portable stand is stan-
dard 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 over-
pressures 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 — Mark II manometers can be mounted on any vertical surface
with the two mounting screws provided. A built-in spirit level simplifies leveling
before mounting screws are tightened. Simply fill the reservoir, adjust fluid level
to zero, connect the tubing, and the gage is ready for operation.
Accessories — Included with each Mark II manometer are two tubing connec-
tors for 1/8" pipe or sheet metal ducts, two mounting screws, 3/4 ounce bottle of
indicating fluid, red and green pointer flags and complete instructions.
The Model 25 also includes 8 feet of flexible double column plastic tubing.
Portable operation of the Model 25 is made possible by the use of the optional
A-612 portable stand. A short piece of tubing can be slipped over the Model 25
pressure connections to contain the gage oil in transit.
The Model 40 contains two 4-1/2 foot lengths of clear plastic tubing, a plastic
swing-out stand and leveling screw for portable operation. It also features con-
venient rapid shutoff pressure connections and integral overpressure safety
traps.
OEM Specials — All Dwyer
®
Mark II molded plastic manometers can be sup-
plied in OEM quantities with your name or special graphics and scales.
SPECIFICATIONS
Accuracy: ±3% full scale.
Maximum Working Temperature: 140°F. (60°C).
Maximum Internal Working Pressure: 10 psi (70 kPa).
*Require Pitot tube at additional cost. See Air Velocity section.
SPECIFICATIONS
Accuracy: ±3% full scale.
Maximum Working Temperature: 130°F. (54°C).
Maximum Internal Working Pressure: 15 psi (100 kPa).
Scale Length: Approx. 8
1
⁄4". (21 centimeters).
*Require Pitot tube at additional cost. See Air Velocity section
1-7/16
[35.53]
1-1/4
[31.75]
1-1/8
[28.58]
2-1/4
[57.15] MAX
Ø7/32 [5.56] HOLE
5-29/32
[150.02]
4-23/32
[119.86]
3-11/16
[93.66]
5/8
[15.88]
7-13/32 [188.12]
25/32 [19.84]
4-25/32
[121.44]
25/32
[19.84]
7/32 X 13/32
[5.56 X 10.32]
MOUNTING SLO
T
15/64 [5.95] x 13/32 [10.32] MOUNTING SLOT
10-5/8 [269.88]
5-5/16
[134.95]
MAX
4-5/8
[117.48]
2-31/32
[75.41]
25/32
[19.84]
Ø15/64 [5.95] MOUNTING HOLE
1-1/4
[31.75]
2-1/4 [57.15]
MAX
4 [101.60]
Mark II Model No. 25 inclined-vertical manometer.
(shown with optional A-612 portable stand)
Model Range
0-3 in w.c
0-7 in. w.c.
0-7000 fpm
0-10,500 fpm
0-80 mm w.c.
0-180 mm w.c.
10-0-700 Pa
Fluid Used
Red oil, .826 s.g.
Blue oil, 1.91 s.g.
Red oil, .826 s.g.
Blue oil, 1.91 s.g.
Red oil, .826 s.g.
Blue oil, 1.91 s.g.
Red oil, .826 s.g.
Model
Range
.1-0-1.0 in. w.c.
0-26 mm w.c.
10-0-250 Pa
.2-0-2.4 in. w.c.
0-60 mm w.c.
20-0-600 Pa
0-1.1 in. w.c. &
0-4200 fpm
0-260 Pa &
0-21 mps
0-2.5 in. w.c. &
0-6300 fpm
Fluid Used
Red oil, .826 s.g.
Red oil, .826 s.g.
Red oil, .826 s.g.
Blue oil, 1.91 s.g.
Blue oil, 1.91 s.g.
Blue oil, 1.91 s.g.
Red oil, .826 s.g.
Red oil, .826 s.g.
Blue oil, 1.91 s g.
Mark II 40-1
Mark II 40-25mm
Mark II 40-250PA
Mark II 41-2
Mark II 41-60mm
Mark II 41-600PA
Mark II 40-1-AV*
Mark II 40-250PA-AV*
Mark II 41 -2-AV*
Mark II 25
Mark II 26
Mark II 27*
Mark II 28*
Mark II MM-80
Mark II MM-180
Mark II M-700PA
A-612, Portable Stand
A-606, Air Filter Kit
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