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Series 1221/1222/1223 Flex-Tube® U-Tube Manometer
Suitable for Pressures up to 100 psi, Better Precision
The Series 1221/1222/1223 Flex-Tube® U-Tube Manometers combine the inherent accuracy of the “U” Tube with the durability of tough, long-lasting plastic construction.The columns are made of 0.375? O.D. flexible and shatterproof clear butyrate tubing and are backed by a white scale channel to provide maximum color contrast. These manometers are ideal wherever a portable, direct reading manometer is needed. See the Support Library tab for Safety Data Sheets.
NIST CALIBRATION available in Product Configurator.
Product Applications
- Duct static pressure
- Calibration labs
- Filter monitoring
Models & Ordering
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.
Accessories
| Model Number | Description | Usually Ships* | Price | Order | |
|---|---|---|---|---|---|
 |
A-101 | 1 oz dispenser bottle of red gage fluid, .826 sp. gr. | Same Day | $10.50 | Order |
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A-102 | 4 oz bottle of red gage fluid, .826 sp. gr. | Same Day | $20.50 | Order |
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A-103 | 1 pt bottle of red gage fluid, .826 sp. gr. | Same Day | $45.50 | Order |
 |
A-104 | 1 qt bottle of red gage fluid, .826 sp. gr. | Same Day | $85.50 | Order |
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A-126 | 1 oz dispenser bottle fluorescein green color concentrate. | Same Day | $16.00 | Order |
 |
A-220 | Clear flexible vinyl tubing is easily inspected, and is therefore best for test applications where a possibility of fluid entering the tubing exists. 3/16" ID x 5/16" OD, lengths to 500'; 45 psi maximum pressure @ 73°F, per ft. | Same Day | $0.50 | Order |
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A-339 | Adapter, brass, 1/8" NPT to 3/16" rubber and 1/8" ID plastic tubing. | Same Day | $5.40 | Order |
 |
A-364 | Magnet assembly for 1222 manometers, 2 required (3 required for 1222-36 and M-1000). | 1-2 Weeks | $10.00 | Order |
 |
A-319 | Flexible red PVC connector, 3/16" ID rubber tubing to 1/4" ID plastic tube for 1221,1222 and 1227 manometers. | Less Than 1 Week | $5.70 | Order |
 |
A-363 | Scale clamp bar for 1221 manometer. | 1-2 Weeks | $7.50 | Order |
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) |
Product Literature
Manuals
Catalog Pages
SDS
Approvals
Drawings
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.
- 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.
- 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.
- 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.
- 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.
- 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.
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