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Series 1221-8-W/M
Service
Manual
Catalog
Page
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Series 1222-8-W/M
Service
Manual
Catalog
Page
|

Series 1223-8-W/M |
Over-Pressure
Safety Traps are featured on Dwyer Series 1223 U-tube manometers. The
action is simple but positive. Over-pressures, whether gradual or a
sudden surge, simply raise the cork and seal the fluid in the gage. When
pressure drops, trap opens and gage resumes operation.
|
| These inexpensive manometers measure
positive, negative and differential pressures. Dwyer Flex-Tube® 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.
STANDARD ACCESSORIES
Series 1221
Two plastic carrying plugs; Two flexible plastic tubing connectors for
attachment of 3/16" rubber or plastic tubing without kinking. 3/4
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.
Series 1222
2 magnetic mounting clips; tube clamp; 2 plastic carrying plugs and 2
flexible plastic tubing connectors for attachment of 3/16" rubber
or plastic tubing without kinking. 3/4 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.
Series 1223
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. 3/4 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.
Series1221
Series1222
Series1223

|
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 ¾ ounce bottle of fluorescein green color
concentrate with special wetting agent for W/M models, or ¾ ounce
bottle of red gage oil for "D" units.
Series 1221 Manometer
Our 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.
One pair of carrying plugs and a pair of non-kink vinyl tube connectors
are included with each manometer.
Series 1222 Manometer
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
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.
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 indicated, “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.
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POPULAR
MODELS
Model
Number |
Range |
Mercury Required to
Fill - Grams |
Mercury Required to
Fill - Ounces |
1221, 2 & 3 Scale
Length "A" |
1221 & 2 O.A.
Length "B" |
Price |
| 1221-8-W/M |
4-0-4 |
178.5 |
6.3 |
12 1/4 |
15 1/4 |
$17.25 |
| 1221-12-W/M |
6-0-6 |
225.5 |
7.9 |
16 1/4 |
19 1/4 |
$18.50 |
| 1221-16-W/M |
8-0-8 |
269 |
9.5 |
20 3/8 |
23 1/4 |
$19.50 |
| 1221-20-W/M |
10-0-10 |
314.5 |
11.1 |
24 1/4 |
27 1/4 |
$20.50 |
| 1221-24-W/M |
12-0-12 |
379.7 |
13.4 |
28 1/4 |
31 1/2 |
$21.50 |
| 1221-36-W/M |
18-0-18 |
491.1 |
17.3 |
40 1/4 |
43 1/4 |
$24.25 |
inches
Oil :
Model
Number |
Range |
1221, 2 & 3 Scale
Length "A" |
1221 & 2 O.A.
Length "B" |
Price |
| 1221-8-D |
4-0-4 |
14 |
17 |
$17.25 |
| 1221-12-D |
6-0-6 |
18 7/8 |
21 3/4 |
$18.50 |
| 1221-16-D |
8-0-8 |
23 5/8 |
26 1/2 |
$19.50 |
| 1221-20-D |
10-0-10 |
28 1/2 |
31 1/2 |
$20.50 |
| 1221-24-D |
12-0-12 |
33 3/8 |
36 1/4 |
$21.50 |
| 1221-36-D |
18-0-18 |
47 7/8 |
50 3/4 |
$24.25 |
mm
water:
Model
Number |
Range |
Mercury Required to
Fill - Grams |
Mercury Required to
Fill - Ounces |
1221, 2 & 3 Scale
Length "A" |
1221 & 2 O.A.
Length "B" |
Price |
| 1221-M200-W/M |
100-0-100 |
178.5 |
6.3 |
12 1/4 |
15 1/4 |
$17.25 |
| 1221-M300-W/M |
150-0-150 |
225.5 |
7.9 |
16 1/4 |
19 1/4 |
$18.50 |
| 1221-M400-W/M |
200-0-200 |
269 |
9.5 |
20 3/8 |
23 1/4 |
$19.50 |
| 1221-M600-W/M |
300-0-300 |
353.1 |
12.4 |
27 7/8 |
30 3/4 |
$21.50 |
| 1221-M1000-W/M |
500-0-500 |
526.6 |
18.5 |
43 5/8 |
46 1/2 |
$24.25 |
mm
oil:
inches
water:
Model
Number |
Range |
Mercury Required to
Fill - Grams |
Mercury Required to
Fill - Ounces |
1221, 2 & 3 Scale
Length "A" |
1221 & 2 O.A.
Length "B" |
Price |
| 1222-8-W/M |
4-0-4 |
178.5 |
6.3 |
12 1/4 |
15 1/4 |
$23.00 |
| 1222-12-W/M |
6-0-6 |
225.5 |
7.9 |
16 1/4 |
19 1/4 |
$24.75 |
| 1222-16-W/M |
8-0-8 |
269 |
9.5 |
20 3/8 |
23 1/4 |
$25.75 |
| 1222-20-W/M |
10-0-10 |
314.5 |
11.1 |
24 1/4 |
27 1/4 |
$26.75 |
| 1222-24-W/M |
12-0-12 |
379.7 |
13.4 |
28 1/4 |
31 1/2 |
$27.75 |
| 1222-36-W/M |
18-0-18 |
491.1 |
17.3 |
40 1/4 |
43 1/4 |
$31.50 |
inches
oil:
Model
Number |
Range |
1221, 2 & 3 Scale
Length "A" |
1221 & 2 O.A.
Length "B" |
Price |
| 1222-8-D |
4-0-4 |
14 |
17 |
$23.00 |
| 1222-12-D |
6-0-6 |
18 7/8 |
21 3/4 |
$24.75 |
| 1222-16-D |
8-0-8 |
23 5/8 |
26 1/2 |
$25.75 |
| 1222-20-D |
10-0-10 |
28 1/2 |
31 1/2 |
$26.75 |
| 1222-24-D |
12-0-12 |
33 3/8 |
36 1/4 |
$27.75 |
| 1222-36-D |
18-0-18 |
47 7/8 |
50 3/4 |
$31.50 |
mm
water:
Model
Number |
Range |
Mercury Required to
Fill - Grams |
Mercury Required to
Fill - Ounces |
1221, 2 & 3 Scale
Length "A" |
1221 & 2 O.A.
Length "B" |
Price |
| 1222-M200-W/M |
100-0-100 |
178.5 |
6.3 |
12 1/4 |
15 1/4 |
$23.00 |
| 1222-M300-W/M |
150-0-150 |
225.5 |
7.9 |
16 1/4 |
19 1/4 |
$24.75 |
| 1222-M400-W/M |
200-0-200 |
269 |
9.5 |
20 3/8 |
23 1/4 |
$25.75 |
| 1222-M600-W/M |
300-0-300 |
353.1 |
12.4 |
27 7/8 |
30 3/4 |
$27.75 |
| 1222-M1000-W/M |
500-0-500 |
526.6 |
18.5 |
43 5/8 |
46 1/2 |
$31.50 |
mm
oil:
inches
water:
Model
Number |
Range |
Mercury Required to
Fill - Grams |
Mercury Required to
Fill - Ounces |
1221, 2 & 3 Scale
Length "A" |
1223 O.A. Length
"B" |
Price |
| 1223-8-W/M |
4-0-4 |
178.5 |
6.3 |
12 1/4 |
18 1/2 |
$46.75 |
| 1223-12-W/M |
6-0-6 |
225.5 |
7.9 |
16 1/4 |
21 1/8 |
$47.25 |
| 1223-16-W/M |
8-0-8 |
269 |
9.5 |
20 3/8 |
26 1/8 |
$47.75 |
| 1223-20-W/M |
10-0-10 |
314.5 |
11.1 |
24 1/4 |
30 1/8 |
$48.75 |
| 1223-24-W/M |
12-0-12 |
379.7 |
13.4 |
28 1/4 |
33 3/8 |
$50.50 |
| 1223-36-W/M |
18-0-18 |
491.1 |
17.3 |
40 1/4 |
46 1/8 |
$53.00 |
inches
oil:
Model
Number |
Range |
1221, 2 & 3 Scale
Length "A" |
1223 O.A. Length
"B" |
Price |
| 1223-8-D |
4-0-4 |
14 |
19 7/8 |
$46.75 |
| 1223-12-D |
6-0-6 |
18 7/8 |
24 5/8 |
$47.25 |
| 1223-16-D |
8-0-8 |
23 5/8 |
30 3/8 |
$47.75 |
| 1223-20-D |
10-0-10 |
28 1/2 |
34 3/8 |
$48.75 |
| 1223-24-D |
12-0-12 |
33 3/8 |
39 1/8 |
$50.50 |
| 1223-36-D |
18-0-18 |
47 7/8 |
53 5/8 |
$53.00 |
mm
water:
Model
Number |
Range |
Mercury Required to
Fill - Grams |
Mercury Required to
Fill - Ounces |
1221, 2 & 3 Scale
Length "A" |
1223 O.A. Length
"B" |
Price |
| 1223-M200-W/M |
100-0-100 |
178.5 |
6.3 |
12 1/4 |
18 1/2 |
$46.75 |
| 1223-M300-W/M |
150-0-150 |
225.5 |
7.9 |
16 1/4 |
21 1/8 |
$47.25 |
| 1223-M400-W/M |
200-0-200 |
269 |
9.5 |
20 3/8 |
26 1/8 |
$47.75 |
| 1223-M600-W/M |
300-0-300 |
353.1 |
12.4 |
27 7/8 |
33 5/8 |
$50.50 |
| 1223-M1000-W/M |
500-500 |
526.6 |
18.5 |
43 5/8 |
49 3/8 |
$53.00 |
mm
oil
Model
Number |
Range |
1221, 2 & 3 Scale
Length "A" |
1223 O.A. Length
"B" |
Price |
| 1223-M200-D |
100-0-100 |
14 |
19 7/8 |
$46.75 |
| 1223-M300-D |
150-0-150 |
18 7/8 |
24 5/8 |
$47.25 |
| 1223-M400-D |
200-0-200 |
23 1/4 |
30 3/8 |
$47.75 |
| 1223-M600-D |
300-0-300 |
32 7/8 |
38 5/8 |
$50.50 |
| 1223-M1000-D |
500-500 |
52 |
57 7/8 |
$53.00 |
| Use Series 1227 as a regular U-tube manometer
to read high-range pressure on the right leg, or as an inclined
manometer to read low-range pressure on the bottom leg. Simply incline
manometer until fluid levels read zero. No spirit level required.
Magnetic clips hold the gage in position on a steel duct surface.
STANDARD ACCESSORIES:
Two plastic carrying plugs with retainers for use when manometers are
not in service. Two magnetic clips to hold instrument to metal surface.
Flexible red vinyl plastic tubing connectors. Brass terminal tube
1/4" diameter X 8" long. One terminal tube holder. Brass
adapter, 1/8" pipe thread to plastic tubing. One 4-1/2' length of
Tygon plastic tubing. One 3/4 ounce bottle .826 sp. gr. red gage fluid.
Vinyl carrying case.
POPULAR
MODELS
Model
Number |
Description |
As Vertical
U-Tube Manometer |
As Inclined
Manometer |
Price |
| 1227M |
Dual Range Flex-Tube U-Inclined Manometer
(Metric) |
Model 1227M (metric) is 0-400mm water
column |
Model 1227M (metric) is -5 to 0 to 70mm
water column |
$50.00 |
| 1227 |
Dual Range Flex-Tube U-Inclined Manometer |
0-16" water with 1" major
divisions, .2" minor divisions |
Scale is 17" long,reading
.20-0-2.6" water with .02" minor divisions |
$50.00 |
|
Series 1227 Manometer
Most versatile and useful low cost manometer we know of. Designed for
installation and servicemen. A sturdy, clear plastic manometer, it
offers single, direct readings in two ranges: As a U-tube, it reads from
0 to 16" of water; as an inclined gage, it reads from -.20 to 0 to
2.6" of water. Model 1227M (Metric) is 0 - 400mm water column as a
U-tube and -5 to 0 to 70mm water column as an inclined gage.
"How-to-use" instructions are printed directly on the scale.
Indicating Tubing -
Clear .400" O.D. tough, shatterproof butyrate. Pressure connection
end is bent to provide over pressure protection when used as an inclined
gage. One 4-1/2' x 3/8" Tygon tube included for pressure source
connection.
Scale -
Stark white high-impact styrene, 21" long. Adjustable for precise
zeroing.
Markings -
1" major, .2" minor graduations on high range; .02"
graduations on low range (50mm major, 10mm minor graduations on high
range, 10mm major, 1mm minor graduations on low range for metric model).
Silkscreened in black on stark white for positive definition.
Acrylic-coated for permanence.
|
| Dwyer Flex-Tube® Well Type
Manometers are designed to meet the need for a direct reading single
column instrument providing highly accurate pressure readings; positive,
negative or differential. Unlike other makes, Dwyer manometers have no
hidden wells or packing glands. These instruments are constructed of
shatter-proof clear plastic tubing permanently bonded to well assemblies
with leakproof glued joints. Well assemblies are precisely machined from
solid acrylic plastic. Overpressure safety traps assure protection
against loss of fluid. Heavy pure white acrylic plastic scales have
sharp black silk screened figures and graduations sealed with clear
mylar coating. Scales are adjusted with quick-acting positive mechanism.
Heavy heat treated aluminum back plates have durable gray hammerloid
finish. These manometers are rated to 100 psig (6.89 bar). Not
recommended for vacuum service beyond 5 in. Hg (68 in w.c.)
NO. 1230 SERIES WALL MOUNTING
NO. 1230 SERIES WALL MOUNTING
Model
No.
|
DIMENSIONS
|
A
|
B
|
C
|
W/M
|
D
|
1230-8
1230-12
1230-16
1230-20
1230-24
1230-36
|
2-3/4
2-3/4
2-3/4
2-3/4
2-3/4
2-3/4
|
15-3/16
19-3/8
23-1/2
27-9/16
32-7/8
43-1/8
|
16-3/4
21-7/8
27
32-1/8
37-3/16
51-1/4
|
1-1/2
1-1/2
1-1/2
1-1/2
1-1/2
1-1/2
|
|
• SERIES NO. 1230 MANOMETERS (wall
mounting type), Have mounting holes for easy installation. They may also
be used as portable manometers and can be hung or attached to any
vertical steel surface by magnetic mounting clips. All parts are fully
visible and readily accessible for cleaning.
• SERIES NO. 1235 MANOMETERS (panel mounting type), All
pressure connections are made from the back, with the micrometer zero
scale adjustment in front at the base of the liquid column.
• MULTI-TUBE MANOMETERS, of the same design as the No. 1235
series are available with any number of tubes mounted on a single panel.
They are designed for semi-flush panel mounting with all pressure
connections made from the back. Reading columns are on 1-1/2"
centers.
• SPECIAL SCALES Psi and metric scales, available in
aluminum panel. Higher ranges and other special scales in Benelex panel.
NO. 1235 SERIES PANEL MOUNTING

NO. 1235 SERIES PANEL MOUNTING
Model
No.
|
DIMENSIONS
|
A
|
B
|
C
|
W/M
|
D
|
1235-8
1235-12
1235-16
1235-20
1235-24
1235-36
|
2-3/4
2-3/4
2-3/4
2-3/4
2-3/4
2-3/4
|
17-3/8
20-7/8
25-1/8
29-5/16
33-9/16
45-1/16
|
18-1/2
23-1/4
28-7/16
33-9/16
38-13/16
51-15/16
|
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2
|
|
STANDARD ACCESSORIES
Includes one set of type "a" connections, .826 sp. gr. red
gage oil for "D" style or fluorescein green dye concentrate
with wetting agent for "W/M" styles, two 3 ft lengths of clear
vinyl tubing and two 1/8" NPT tubing adapters. |
TO ORDER:
Please indicate scale desired. Specify "W/M" with Model Number
for inches of water, using water or inches of mercury, using mercury;
and "D" 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 indicated,
"W/M" style manometers will be shipped. |
 |
Series
1213 |
Gas
Pressure Manometer
The "Tube in a Tube"
Direct Reading Manometer. |
| Provide visual indication of pressure with the
Series 1213 Gas Pressure Manometer. Designed for use with natural gas,
the manometer can also be used to monitor any compatible gases up to 15
inches of water column. Tap water is used as the sensing media and a
magnetic clip provides temporary or permanent mounting. Economically
priced and made of durable plastic for years of trouble-free service.
Includes three feet of vinyl tubing and 1/8" nylon male NPT to barb
fitting. |
SPECIFICATIONS
Temperature Limit: 140°F (60°C) maximum.
Pressure Limits: 15" in. w.c. (381).
Piping Connections: 1/8" male NPT connector provided.
Wetted Materials: Vinyl, PVC and Nylon.
Weight: 5 oz. (142g).
|
POPULAR
MODELS
Model
Number |
Length (mm) |
Price |
| 1213-7 |
7" (177.8) |
$17.25 |
| 1213-15 |
15" (381) |
$17.25 |

Slack-Tube®Manometer rolled up for easy
handling and storage.
Service
Manual
Catalog
Page
|

Slack-Tube®Manometer extended with enlarged
view of molded high impact acrylic top, Connector and over pressure
safety traps.
NOTE: When used with mercury, some discoloration of the vinyl tubing
will normally occur. |
The Handy Roll-Up
Manometer With Laboratory Accuracy
Dwyer Slack-Tube® Manometers are as accurate as the finest
laboratory "U" gages - yet they are made to roll up compactly
for easy carrying and to withstand rough usage.
Simply unroll the Dwyer Slack-Tube® Manometer and set up to
read static pressure, vacuum, or differential pressure. Magnetic clips
hold it firmly to any steel surface or hang it on a nail. Turn
connectors one revolution to open. When the pressure is imposed, add the
number of inches one column travels up to the number of inches the other
column travels down. When reading is completed turn connectors to seal
columns, roll up manometer into compact coil and tuck it away in its
circular metal case or a tool box. No fluid lost. No loose caps or
inserts to lose.
Dwyer Slack-Tube® Manometers cover a wide range of pressure
readings - from 4-0-4 inches up to 60-0-60 inches. Use them in
determining velocity and static pressures, for leakage, fan and blower
tests, calibrating control devices, checking gas pressure and many other
applications. All models have flexible vinyl-plastic columns and
flexible spring steel scale calibrated in inches of water using water;
and inches of mercury using mercury. Scale is center-mounted between
columns to eliminate parallax error and has a full 2" sliding zero
adjustment.
All Dwyer Slack-Tube® Manometers feature exclusive molded
nylon tubing connector assemblies with rapid shutoff design in an
acrylic plastic top. One turn counter clockwise and the instrument is
ready for use. Another turn seals the tubes completely. Molded all-nylon
construction makes this assembly corrosion-proof, leakproof and
practically unbreakable. Tubing connectors extend horizontally allowing
360° freedom. Tubes won't bend or pinch off.
All models have over pressure safety traps in the top of both columns to
prevent loss of fluid due to over range pressures or surges in pressure.
See Fig. 7-3.
Slack-Tube® Manometers are suitable for intermittent total pressure to
50 psi and vacuum not exceeding 20" Hg. Avoid temperatures above
130°F and continuous high total pressure. Not for use with red gage
oil; use only water or mercury.
POPULAR
MODELS
|
POPULAR
MODELS
Model
Number |
Range, CM |
Hg Req'd
(oz.) |
Price |
| 1211-50 |
25-0-25 |
11 |
$50.50 |
| 1211-100 |
50-0-50 |
18 1/2 |
$52.00 |
| 1211-200 |
100-0-100 |
35 |
$65.00 |
|
POPULAR
MODELS
Model
Number |
Description |
Price |
| 1212 |
Gas Pressure Kit |
$59.00 |
|
|
|