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 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 filter gage applications.
Both gage types are capable of pressure measurements above and below atmospheric as well
as differential pressure measurements.
Mark II Model No.40-1 inclined manometer
A-606, Air Filter Kit
Model	Range		Fluid Used
Mark II 40-1	.1-0-1.0 in w.c.		Red oil, .826 s.g.
Mark II 40-25mm	0-26 mm w.c.		Red oil, .826 s.g.
Mark II 40-250PA	10-0-250 Pa		Red oil, .826 s.g.
Mark II 41-2	.2-0-2.4 in w.c.		Blue oil, 1.91 s.g.
Mark II 41-60mm	0-60 mm w.c.		Blue oil, 1.91 s.g.
Mark II 41-600PA	20-0-600 Pa		Blue oil, 1.91 s.g.
Mark II 40-1-AV*	0-1.1 in w.c. & 0-4200 fpm		Red oil, .826 s.g.
Mark II 40-250PA-AV*	0-260 Pa & 0-21 mps		Red oil, .826 s.g.
Mark II 41-2-AV*	0-2.5 in w.c. & 0-6300 fpm		Blue oil, 1.91 s.g.
* Require Pilot tube at additional cost.
SPECIFICATIONS
Accuracy:		+/-3% full scale
Maximum Working Temperature:		130๐F (54๐C)
Maximum Internal Working Pressure:		15 psi (100 kPa)
Scale Length:		Approx. 8 1/4” (21 centimeters)