Ø15/64 [5.95] MOUNTING HOLE
SERIES MARK II
MARK II MOLDED PLASTIC MANOMETERS
3% Accuracy For Stationary And Portable Applications
PRESSURE
1-1/4
[31.75]
[35.53]
4-25/32
[121.44]
5/8
[15.88]
25/32
[19.84]
[93.66]
Ø7/32 [5.56] HOLE
5-29/32
[150.02]
4-23/32
[119.86]
Series Mark II Molded Plastic 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
purpose work. The Model 40 inclined gage provides linear calibration and excellent
resolution throughout its range. The Model 40 is ideally suited for air velocity and
air lter gage applications. Both gage types are capable of pressure measurements
above and below atmospheric as well as differential pressure measurements.
Included with each Mark II manometer are two tubing connectors for 1/8˝ pipe or sheet
metal ducts, two mounting screws, 1 ounce bottle of indicating uid, red and green
pointer ags and complete instructions.
The Model 25 also includes 8´ of exible double column plastic tubing. Portable
Manometers, Stationary
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 uid in transit.
The Model 40 contains two 4-1/2´ lengths of clear plastic tubing, a plastic swing-out
stand and leveling screw for portable operation. It also features convenient rapid
shutoff pressure connections and integral overpressure safety traps.
FEATURES/BENEFITS
• Broad ranging in easy to read calibrated increments
• Gages ideally suited for general measurements and specic air applications
• Compact, stationary or portable device, make it a simple to use tool for pressure
measurement in OEM or user applications
APPLICATIONS
• Paint booths
• Air velocity measurement
• Air lter gage
OEM SPECIALS
All Dwyer
your name or special graphics and scales.
ACCESSORIES
Model Description
A-612
A-606
A-480
A-489
DWYER INSTRUMENTS, INC. 28
Mark II Model No. 25 inclined-vertical manometer.
(shown with optional A-612 portable stand)
E
O
D
I
V
O
N
L
I
N
Mark II Model No. 40-1 inclined manometer
®
Mark II molded plastic manometers can be supplied in OEM quantities with
Portable stand
Air lter kit
Plastic static pressure tip
4˝ straight static pressure tip with ange
1-1/8
2-1/4
[57.15] MAX
15/64 [5.95] x 13/32 [10.32]
MOUNTING SLOT
10-5/8 [269.88]
25/32 [19.84]
7-13/32 [188.12]
2-31/32
[75.41]
[19.84]
25/32
2-1/4 [57.15]
4-5/8
[117.48]
7/32 X 13/32
[5.56 X 10.32]
MOUNTING SLOT
5-5/16
[134.95]
MAX
MAX
1-1/4
[31.75]
4 [101.60]
SPECIFICATIONS
INCLINED/VERTICAL
Accuracy: ±3% FS.
Temperature Limits: 140°F (60°C).
Pressure Limits: 10 psi (70 kPa).
Weight: 1.04 lb (472 g).
Agency Approvals: Meets the technical requirements of EU Directive 2011/65/EU
(RoHS II).
INCLINED
Accuracy: ±3% FS.
Temperature Limits: 150°F (65°C).
Pressure Limits: 15 psi (100 kPa).
Scale Length: Approx. 8-1/4˝ (21 cm).
Weight: 1.23 lb (558 g).
Agency Approvals: Meets the technical requirements of EU Directive 2011/65/EU
(RoHS II).
MODEL CHART
Model Range Fluid Used
Mark II 25
Mark II 26
Mark II 27*
Mark II MM-80
Mark II M-700PA
Mark II 40-1
Mark II 40-25MM
Mark II 40-250PA
Mark II 41-60MM
Mark II 41-600PA
0-3 in w.c
0-7 in w.c.
0-7000 fpm
0-80 mm w.c.
10-0-700 Pa
.1-0-1.0 in w.c.
0-26 mm w.c.
10-0-250 Pa
0-60 mm w.c.
20-0-600 Pa
Red uid, .826 s.g.
Blue oil, 1.91 s.g.
Red uid, .826 s.g.
Red uid, .826 s.g.
Red uid, .826 s.g.
Red uid, .826 s.g.
Red uid, .826 s.g.
Red uid, .826 s.g.
Blue oil, 1.91 s.g.
Blue oil, 1.91 s.g.
*Require Pitot tube at additional cost.u
Process Tubing Options: See page 455 (Gage Tubing Accessories)
uPitot tube: See pages 186-188 (Test & Data section)