Owner's manual

With both ends of the tube open,
the liquid is at the same height in
each leg.
The difference in height, “h”, which
is the sum of the readings above
and below zero, indicates the
amount of vacuum.
Measuring Pressure, Vacuum and Differential
Pressure with Dwyer
®
Manometers
Dwyer manometers are available in two different
styles. The W/M models use either water for
readings in inches of water or mercury for
readings in inches of mercury. The D models use
Dwyer .826 specific gravity red gage fluid for
readings in inches of water. The scales on the
two styles have different lengths, so it is
important to use the correct fluid.
Mounting Dwyer U-Tube Manometers
1221 - Mount to a vertical surface through holes
in the scale.
1222 - Attach magnets to steel surface or
remove magnets and mount through holes in
scale.
1223 - Attach magnets to steel surface or
through the hole in safety trap housing.
1227 - Because of angled connections, 1227
must be filled with indicating tube at an angle.
After filling, check zero in vertical position. Clean
all fluid from the exterior of the unit to prevent
cracking of the backplate.
Note: Read vertical range on the right leg with
the manometer vertical. Incline the manometer
to zero for low range reading.
Mounting Dwyer Well Manometers
1230 - Mount to a vertical surface with flat-head
screws through the holes in the scale.
1235 - Mount behind panel cutout to show only
the tube and scale. Attach by drilling holes
through the manometer’s back-plate and
panels. Make the panel cutout for the length and
width of the tube and scale.
Bulletin D-21
Flex-Tube
®
Manometer
Installation & Operating Instructions
DWYER INSTRUMENTS, INC. Phone: [phone] www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, IN 46360, U.S.A. Fax: [phone]
e-mail: [e-mail]
The difference in height, “h”, which
is the sum of the readings above
and below zero, indicates
pressure.
Fig. 1
Fig. 2
Fig. 3
1220/1230 Series
U-Tube and Well-Type Manometers
Pressure
Vacuum