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1221-8-W/M

Representative image displayed of 201|Actual product may vary

201

Series 1221/1222/1223 Flex-Tube® U-Tube Manometer

Suitable for Pressures up to 100 psi, Better Precision

Dwyer® Flex-Tube® U-Tube Manometers combine the inherent accuracy of the simple "U" Tube with the durability of tough, long-lasting plastic construction. These inexpensive manometers measure positive, negative and differential pressures. 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. See the Support Library tab for Safety Data Sheets.

NIST CALIBRATION available in Product Configurator.

Product Applications

Duct static pressure
Calibration labs
Filter monitoring

Starting at $67.65

Ordering

Grouped product items
Model	Description	Availability*	Price
1221-12-D	U-tube manometer, range 6-0-6" w.c.	1-3 days*	$74.30
1221-12-W/M	U-tube manometer, range 6-0-6" w.c.	Less Than 1 Week*	$74.30
1221-16-D	U-tube manometer, range 8-0-8" w.c.	1-3 days*	$76.55
1221-16-W/M	U-tube manometer, range 8-0-8" w.c.	Less Than 1 Week*	$76.55
1221-20-D	U-tube manometer, range 10-0-10" w.c.	Less Than 1 Week*	$80.40
1221-20-W/M	U-tube manometer, range 10-0-10" w.c.	Less Than 1 Week*	$80.40
1221-24-D	U-tube manometer, range 12-0-12" w.c.	Less Than 1 Week*	$84.75
1221-24-W/M	U-tube manometer, range 12-0-12" w.c.	Less Than 1 Week*	$84.75
1221-36-D	U-tube manometer, range 18-0-18" w.c.	Less Than 1 Week*	$94.20
1221-36-W/M	U-tube manometer, range 18-0-18" w.c.	Less Than 1 Week*	$94.20
1221-8-D	U-tube manometer, range 4-0-4" w.c.	Less Than 1 Week*	$67.65
1221-8-W/M	U-tube manometer, range 4-0-4" w.c.	Less Than 1 Week*	$67.65
1221-M1000-D	U-tube manometer, range 500-0-500 mm w.c.	Less Than 1 Week*	$94.20
1221-M1000-W/M	U-tube manometer, range 500-0-500 mm w.c.	Less Than 1 Week*	$94.20
1221-M200-D	U-tube manometer, range 100-0-100 mm w.c.	1-3 days*	$67.65
1221-M200-W/M	U-tube manometer, range 100-0-100 mm w.c.	Less Than 1 Week*	$67.65
1221-M300-D	U-tube manometer, range 150-0-150 mm w.c.	1-3 days*	$74.30
1221-M300-W/M	U-tube manometer, range 150-0-150 mm w.c.	Less Than 1 Week*	$74.30
1221-M400-D	U-tube manometer, range 200-0-200 mm w.c.	Less Than 1 Week*	$76.55
1221-M400-W/M	U-tube manometer, range 200-0-200 mm w.c.	Less Than 1 Week*	$76.55
1221-M600-D	U-tube manometer, range 300-0-300 mm w.c.	Less Than 1 Week*	$84.75
1221-M600-W/M	U-tube manometer, range 300-0-300 mm w.c.	Less Than 1 Week*	$84.75
1222-8-D	U-tube manometer, range 4-0-4" w.c.	Less Than 1 Week*	$89.35
1222-8-W/M	U-tube manometer, range 4-0-4" w.c.	3-4 Weeks*	$89.35
1222-12-D	U-tube manometer, range 6-0-6" w.c.	Less Than 1 Week*	$96.50
1222-12-W/M	U-tube manometer, range 6-0-6" w.c.	1-3 days*	$96.50
1222-16-D	U-tube manometer, range 8-0-8" w.c.	Less Than 1 Week*	$99.80
1222-16-W/M	U-tube manometer, range 8-0-8" w.c.	1-3 days*	$99.80
1222-20-D	U-tube manometer, range 10-0-10" w.c.	Less Than 1 Week*	$103.10
1222-20-W/M	U-tube manometer, range 10-0-10" w.c.	3-4 Weeks*	$103.10
1222-24-D	U-tube manometer, range 12-0-12" w.c.	Less Than 1 Week*	$105.95
1222-24-W/M	U-tube manometer, range 12-0-12" w.c.	1-3 days*	$105.95
1222-36-D	U-tube manometer, range 18-0-18" w.c.	Less Than 1 Week*	$126.35
1222-36-W/M	U-tube manometer, range 18-0-18" w.c.	3-4 Weeks*	$126.35
1222-M200-D	U-tube manometer, range 100-0-100 mm w.c.	Less Than 1 Week*	$89.35
1222-M200-W/M	U-tube manometer, range 100-0-100 mm w.c.	3-4 Weeks*	$89.35
1222-M300-D	U-tube manometer, range 150-0-150 mm w.c.	Less Than 1 Week*	$96.50
1222-M300-W/M	U-tube manometer, range 150-0-150 mm w.c.	3-4 Weeks*	$96.50
1222-M400-D	U-tube manometer, range 200-0-200 mm w.c.	Less Than 1 Week*	$99.80
1222-M400-W/M	U-tube manometer, range 200-0-200 mm w.c.	3-4 Weeks*	$99.80
1222-M600-D	U-tube manometer, range 300-0-300 mm w.c.	Less Than 1 Week*	$105.95
1222-M600-W/M	U-tube manometer, range 300-0-300 mm w.c.	3-4 Weeks*	$105.95
1222-M1000-D	U-tube manometer, range 500-0-500 mm w.c.	Less Than 1 Week*	$126.35
1222-M1000-W/M	U-tube manometer, range 500-0-500 mm w.c.	3-4 Weeks*	$126.35
1223-8-D	U-tube manometer, range 4-0-4" w.c.	Less Than 1 Week*	$183.80
1223-8-W/M	U-tube manometer, range 4-0-4" w.c.	3-4 Weeks*	$183.80
1223-12-D	U-tube manometer, range 6-0-6" w.c.	Less Than 1 Week*	$183.80
1223-12-W/M	U-tube manometer, range 6-0-6" w.c.	3-4 Weeks*	$183.80
1223-16-D	U-tube manometer, range 8-0-8" w.c.	1-3 days*	$157.25
1223-16-W/M	U-tube manometer, range 8-0-8" w.c.	3-4 Weeks*	$157.25
1223-20-D	U-tube manometer, range 10-0-10" w.c.	Less Than 1 Week*	$188.35
1223-20-W/M	U-tube manometer, range 10-0-10" w.c.	3-4 Weeks*	$188.35
1223-24-D	U-tube manometer, range 12-0-12" w.c.	Less Than 1 Week*	$196.05
1223-24-W/M	U-tube manometer, range 12-0-12" w.c.	3-4 Weeks*	$196.05
1223-36-W/M	U-tube manometer, range 18-0-18" w.c.	3-4 Weeks*	$204.95
1223-M200-D	U-tube manometer, range 100-0-100 mm w.c.	Less Than 1 Week*	$183.80
1223-M200-W/M	U-tube manometer, range 100-0-100 mm w.c.	3-4 Weeks*	$183.80
1223-M300-D	U-tube manometer, range 150-0-150 mm w.c.	Less Than 1 Week*	$183.80
1223-M300-W/M	U-tube manometer, range 150-0-150 mm w.c.	3-4 Weeks*	$183.80
1223-M400-D	U-tube manometer, range 200-0-200 mm w.c.	Less Than 1 Week*	$157.25
1223-M400-W/M	U-tube manometer, range 200-0-200 mm w.c.	3-4 Weeks*	$157.25
1223-M600-D	U-tube manometer, range 300-0-300 mm w.c.	Less Than 1 Week*	$196.05
1223-M600-W/M	U-tube manometer, range 300-0-300 mm w.c.	3-4 Weeks*	$196.05
1223-M1000-D	U-tube manometer, range 500-0-500 mm w.c.	Less Than 1 Week*	$204.95
1223-M1000-W/M	U-tube manometer, range 500-0-500 mm w.c.	3-4 Weeks*	$204.95

Features

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 3/4 ounce bottle of fluorescein green color concentrate with special wetting agent for W/M models, or 3/4 ounce bottle of red gage fluid 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 fluid. 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.

Support Library

Approvals

Drawings

Model Chart

EXAMPLE	1221	8	W/M	AT	Series 1221-8-W/M-AT U-Tube Manometer, range 4-0-4" w.c. using water/mercury, with aluminum tag.
SERIES	1221 1222 1223				U-Tube Manometer U-Tube Manometer U-Tube Manometer
RANGE		8 12 16 20 24 36 M200 M300 M400 M600 M1000 2000PA 3000PA 4000PA 5000PA 6000PA 9000PA			4-0-4" w.c. 6-0-6" w.c. 8-0-8" w.c. 10-0-10" w.c. 12-0-12" w.c. 18-0-18" w.c. 100-0-100 mm w.c. 150-0-150 mm w.c. 200-0-200 mm w.c. 300-0-300 mm w.c. 500-0-500 mm w.c. 1000-0-1000 Pa 1500-0-1500 Pa 2000-0-2000 Pa 2500-0-2500 Pa 3000-0-3000 Pa 4500-0-4500 Pa
FLUID			W/M D		Inches of Water/Mercury Inches of Water Using Red Gage Fluid
OPTIONS				AT NIST B C D E	Aluminum Tag NIST Certificate of Calibration Type B Connections (available with 1223 only) Type C Connections (available with 1223 only) Type D Connections (available with 1223 only) Type E Connections (available with 1223 only)

FAQ

Questions

Question

What are the principle advantages of red gage fluid over water for use in manometers?

Answer

Red gage fluid is slow to evaporate, won't freeze, is more readable and produces slightly expanded scales for better reading resolution.

Related

Series 420

Series 100 AV

Series 1227

Series 100

Series 1221/1222/1223

Question

Is routine maintenance required for a Dwyer red gage fluid type manometer?

Answer

Yes. The zero point should be checked periodically as well as the fluid level. After a year of service, particularly with dirty air, the fluid should be replaced to assure that specific gravity changes are not affecting the accuracy of the reading.

Related

Series 1227

Series Mark II

Series 1230/1235

Series 100

Series 250-AF

Series 420

Series 200 & 300

Series 1221/1222/1223

Series 100 AV

Series 400

Question

Will the water manometers freeze?

Answer

Yes, if the temperature drops below 32 degrees Fahrenheit, the fluid in the manometer will freeze. The fluid used in "W/M" style manometers is water-based with a small amount of fluorescent green fluid to enhance the meniscus. The other gage fluids have a lower freezing point, however, it is recommended that the manometers be stored above 32 degrees Fahrenheit.

Related

Series 1227

Series 1230/1235

Series 1221/1222/1223

Question

Since water will not mix with oil, why can't a D-style manometer be used to measure water pressures?

Answer

The weight of the water itself is also being measured which results in erroneous readings.

Related

Series 1221/1222/1223

Question

Why doesn't 1 inch on the scale of a 1223-12-D manometer equal 1 inch on a ruler?

Answer

The calibration scale on the manometer has been compensated for the specific gravity of red gage fluid which is less than water.

Related

Series 1221/1222/1223

Question

Model 1212. How much fluid mixture is required? What is the best method to fill this unit?

Answer

A 1 oz bottle of A-126 Fluorescein green color concentrate is added to a quart of distilled water. Remove a tubing connector from the manometer and pour the mixture in to mid-point level. Shake the manometer to remove air bubbles and slide the scale so the zero mark is in line with the meniscus of the two fluid columns.

Related

Gage Fluids

Series 1211/1212

Series 1221/1222/1223

Reviews

Accessories

Model	Description	Availability*	Price
A-101	1 oz dispenser bottle of red gage fluid, .826 sp. gr.	1-3 days*	$11.75
A-102	4 oz bottle of red gage fluid, .826 sp. gr.	1-3 days*	$22.70
A-103	1 pt bottle of red gage fluid, .826 sp. gr.	1-3 days*	$50.05
A-104	1 qt bottle of red gage fluid, .826 sp. gr.	1-3 days*	$94.20
A-126	1 oz dispenser bottle fluorescein green color concentrate.	1-3 days*	$17.60
A-220	Clear flexible vinyl tubing, 3/16" ID x 5/16" OD, lengths to 500'; 45 psi maximum pressure @ 73°F.	Call for Details*	$0.80
A-339	Adapter, brass, 1/8" NPT to 3/16" rubber and 1/8" ID plastic tubing.	1-3 days*	$6.20
A-364	Magnet assembly for 1222 manometers, 2 required (3 required for 1222-36 and M-1000).	1-2 Weeks*	$11.00
A-363	Scale clamp bar for 1221 manometer.	1-2 Weeks*	$8.50
A-319	Flexible red PVC connector, 3/16" ID rubber tubing to 1/4" ID plastic tube for 1221,1222 and 1227 manometers.	1-3 days*	$6.40

1221-8-W/M

201

Series 1221/1222/1223 Flex-Tube® U-Tube Manometer

Product Applications

Features

Product Literature

Manuals

Catalog Pages

SDS

Approvals

Drawings

Model Chart

Questions