These inexpensive manometers measure positive, negative and differential 
pressures. Dwyer Flex-Tube?/sup> U-Tube Manometers combine the inherent 
accuracy of the simple "U" Tube with the durability of tough, long-lasting 
plastic construction. Columns are of .375" O.D. flexible and shatter proof 
clear butyrate tubing. They are easily accessible for cleaning. Indicating tube 
is backed by white scale channel to provide maximum color contrast. Scales are
extruded high impact polystyrene plastic, formed to hold columns in perfect 
alignment. Stark white scales have graduations and numbers silkscreen-printed 
in black for maximum legibility. 

You can choose from numerous models and features including over-pressure safety
 traps, in full scale ranges from 8" to 36" of water or mercury. All are 
suitable for total pressures to 100 psi - for determining velocity and static 
pressures, leakage, fan and blower efficiency, filter resistance, and gas 
pressures. Ideal wherever a portable, direct reading manometer is needed. 
Standard ranges and markings as shown, or special ranges, colors, logos and 
brand names for OEM quantity orders are available. 

Minor Divisions of 1/10" water column (or 2mm water column on metric units) are
 silkscreened in jet black on stark white scale for positive definition. Easy 
to read, even at a distance, they are acrylic coated for permanence. All models
 are furnished with one ?ounce bottle of fluorescein green color concentrate 
with special wetting agent for W/M models, or ?ounce bottle of red gage oil 
for "D" units. 

Series 1221 Manometer, Fig. 10-1. Out simplest, lowest cost basic U-gage. A 
dependable U-tube manometer that withstands hard use and provides accurate, 
high visibility readings. For use with water, mercury or red gage oil. For 
mercury filled manometers, a scale clamp bar, Dwyer Part No. A-363 (available 
as an extra for Series 1221 - and standard on Series 1222) is recommended. Pair 
of carrying plugs and a pair of non-kink vinyl tube connectors included with 
each manometer. 

Series 1222 Manometer, Fig. 10-2. All the features of the 1221 plus magnetic
 clips for mounting to any vertical steel surface, and clamp bar to insure 
against U-tube slipping. (Especially recommended for manometers used with 
mercury.) Both magnets are easily removed and replaced at the user's 
convenience. 

Series 1223 Manometer, Fig. 11-1. Our finest U-gage - for either portable or 
stationary use. Safety traps prevent loss of indicating fluid in case of 
accidental over-pressure. Tubing is permanently bonded to a molded, high impact 
acrylic plastic top that contains safety traps. Large magnetic clips and clamp 
bar are provided. Standard type "a" connections include two rapid shut-off type 
molded nylon tubing connections, two 3' lengths of flexible Tygon plastic 
tubing, and two 1/8" pipe thread to tube adapters. 


STANDARD ACCESSORIES
(For Series 1221-8-W/M)
Two plastic carrying plugs; Two flexible plastic tubing connectors for 
attachment of 3/16" rubber or plastic tubing without looking. ?ounce 
bottle .826 sp. gr. red gage oil furnished for "D" style manometers. 
Fluorescein green dye concentrate furnished with "W/M" style manometers. 
Mercury is available at extra cost. 

STANDARD ACCESSORIES
(For Series 1222-8-W/M)
Two magnetic mounting clips; tube clamp; Two plastic carrying plugs and Two 
flexible plastic tubing connectors for attachment of 3/16" rubber or plastic 
tubing without kinking. ?ounce bottle .826 sp. gr. red gage oil furnished 
for "D" style manometers. Fluorescein green dye concentrate furnished 
with "W/M" style manometers. Mercury is available at extra cost. 

STANDARD ACCESSORIES
(For Series 1223-8-W/M)
Magnetic mounting clips; tube clamp and Type "a" connections consisting of two
 rapid shut off molded nylon tubing connectors; two 1/8" pipe thread to tube 
adapters; two 3' lengths of Tygon plastic tubing. (See Page 26 for alternate 
connections) ?ounce bottle .826 sp. gr. red gage oil furnished for "D" style 
manometers. Fluorescein green dye concentrate furnished with "W/M" style 
manometers. Mercury is available at extra cost. 

How To Order: 
1. Indicate series such as 1222. 2. Indicate range desired such as: 8, 12 or
 M200. 3. Specify "W/M" with model number for inches* of water , using water or
 inches* of mercury, using mercury. Specify "D" with model number for inches* 
of water using .826 sp. gr. red gage oil. Red gage oil is often preferred for 
readings in inches of water because of the longer scale and slower evaporation 
rate. This lessens the need for frequent re-zeroing and refilling. (If not 
otherwise indicate, "W/M" style manometers will be shipped.) 4. For Series 1223 
only, state the connection option desired if other than standard type "a". For 
example, 1223-12-D-"b" manometer is a Series 1223, range 12" w.c. (scale 6-0-
6), using red gage oil with type "b" connections.
*metric units are in millimeters.