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.
- Duct static pressure
- Calibration labs
- Filter monitoring
Models & Ordering
- 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.
|Model Number||Description||Usually Ships*||Price||Order|
|A-101||1 oz dispenser bottle of red gage fluid, .826 sp. gr.||Same Day||$10.25||Order|
|A-102||4 oz bottle of red gage fluid, .826 sp. gr.||Same Day||$20.00||Order|
|A-103||1 pt bottle of red gage fluid, .826 sp. gr.||Same Day||$44.50||Order|
|A-104||1 qt bottle of red gage fluid, .826 sp. gr.||Same Day||$83.50||Order|
|A-126||1 oz dispenser bottle fluorescein green color concentrate.||Same Day||$15.50||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||$0.45||Order|
|A-339||Adapter, brass, 1/8" NPT to 3/16" rubber and 1/8" ID plastic tubing.||Same Day||$5.10||Order|
|A-364||Magnet assembly for 1222 manometers, 2 required (3 required for 1222-36 and M-1000).||1-2 Weeks||$9.50||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||$5.50||Order|
|A-363||Scale clamp bar for 1221 manometer.||1-2 Weeks||$7.10||Order|
|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.|
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.
Inches of Water/Mercury
Inches of Water Using Red Gage Fluid
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)
- What are the principle advantages of red gage fluid over water for use in manometers?
- Red gage fluid is slow to evaporate, won't freeze, is more readable and produces slightly expanded scales for better reading resolution.
- Is routine maintenance required for a Dwyer red gage fluid type manometer?
- 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.
- Will the water manometers freeze?
- 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.
- Since water will not mix with oil, why can't a D-style manometer be used to measure water pressures?
- The weight of the water itself is also being measured which results in erroneous readings.
- Why doesn't 1 inch on the scale of a 1223-12-D manometer equal 1 inch on a ruler?
- The calibration scale on the manometer has been compensated for the specific gravity of red gage fluid which is less than water.
- Model 1212. How much fluid mixture is required? What is the best method to fill this unit?
- 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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