Series 1230/1235 Flex-Tube® Well-Type Manometers

No Moving Parts, Suitable for Laboratory or General Industry

Dwyer® Series 1230 & 1235 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 leak-proof glued joints. Well assemblies are precisely machined from solid acrylic plastic. Over-pressure safety traps assure protection against loss of fluid. Scales are adjusted with quick-acting positive mechanism. These manometers are rated to 100 psig (6.89 bar). Not recommended for vacuum service beyond 5" Hg (68" w.c.).

NIST CALIBRATION available in Product Configurator.

Product Applications

  • Laboratory and industrial service applications

Models & Ordering

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Shipping Information

All shipping times are dependent on product availability at time of shipment.

Although we make every effort to ensure a continuous supply of our products, occasional circumstances may force us to temporarily run out of a product, or have shipping delays. Should this occur, customers will be notified soon after placement of any orders for such products and, if applicable, items will be put on backorder. For orders requiring expedited shipment, our customer service team can be contacted to confirm product availability

Build Your Custom Part. Use our Product Configurator

Model Description Usually Ships* Price Order
1230-12-W/M
Ships: 3-4 Weeks
Price: $468.00
Well-type manometer, range 0-12, 14 oz mercury required. 3-4 Weeks* $468.00 Order
1230-16-W/M
Ships: 3-4 Weeks
Price: $497.00
Well-type manometer, range 0-16, 16 oz mercury required. 3-4 Weeks* $497.00 Order
1230-20-W/M
Ships: 3-4 Weeks
Price: $509.00
Well-type manometer, range 0-20, 18 oz mercury required. 3-4 Weeks* $509.00 Order
1230-24-W/M
Ships: 3-4 Weeks
Price: $531.00
Well-type manometer, range 0-24, 20 oz mercury required. 3-4 Weeks* $531.00 Order
1230-8-W/M
Ships: 3-4 Weeks
Price: $441.00
Well-type manometer, range 0-8, 12 oz mercury required. 3-4 Weeks* $441.00 Order

Can't find what you need? Build Your Custom Part. Use our Product Configurator

Features

  • 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.
  • HIGH-ACCURACY PRESSURE MEASUREMENT suitable for laboratory or general industry.
  • PRECISION BUILT assures device meets the highest standards.
  • NO MOVING PARTS mean no calibration or nothing to wear out.
  • OVER-PRESSURE TRAP prevents liquid from being expelled from gage, preventing disruption of operation.

Accessories

Model Number Description Usually Ships* Price Order
1 oz dispenser bottle of red gage fluid, .826 sp. gr. A-101 1 oz dispenser bottle of red gage fluid, .826 sp. gr. Same Day $10.25 Order
4 oz bottle of red gage fluid, .826 sp. gr. A-102 4 oz bottle of red gage fluid, .826 sp. gr. Same Day $20.00 Order
1 pt bottle of red gage fluid, .826 sp. gr. A-103 1 pt bottle of red gage fluid, .826 sp. gr. Same Day $44.50 Order
1 qt bottle of red gage fluid, .826 sp. gr. A-104 1 qt bottle of red gage fluid, .826 sp. gr. Same Day $83.50 Order
1 oz dispenser bottle fluorescein green color concentrate. A-126 1 oz dispenser bottle fluorescein green color concentrate. Same Day $15.50 Order
Gage connector, shutoff type, for 3/16 A-315 Gage connector, shutoff type, for 3/16" rubber tubing. 1-2 Weeks $17.50 Order
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 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
Adapter, brass, 1/8 A-339 Adapter, brass, 1/8" NPT to 3/16" rubber and 1/8" ID plastic tubing. Same Day $5.10 Order

Model Chart

EXAMPLE 1230 8 W/M B Series 1230-8-WM-B Wall Mount Flex-Tube® Well-Type Manometer, range 0-8" w.c., using water/mercury, with type B connections.
SERIES 1230
1235
      Wall Mount Flex-Tube® Well-Type Manometer
Panel Mount Flex-Tube® Well-Type Manometer
RANGE   8
12
16
20
24
36
20CM
30CM
40CM
50CM
60CM
90CM
    0-8" w.c.
0-12" w.c.
0-16" w.c.
0-20" w.c.
0-24" w.c.
0-36" w.c.
0-20 cm w.c.
0-30 cm w.c.
0-40 cm w.c.
0-50 cm w.c.
0-60 cm w.c.
0-90 cm w.c.
FLUID     W/M
D
  Water/Mercury
Red Gage Fluid (.826 specific gravity) (not available with 40CM range)
OPTIONS       B
C
D
E
AT
NIST
(2) molded nylon rapid shutoff tubing connectors, 9' of rubber tubing and (1) brass terminal tube
(2) 1/8" pipe thread openings
(2) compression fittings for 1/4" O.D. copper or aluminum tubing
(2) 3-way vent valves, 1/8" 1/8 NPT to 1/4" metal tubing
Aluminum Tag
NIST Certificate of Calibration

Approvals

Drawings

Questions

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
What is the density of Fluoroscein Green Concentrate after mixing 3/4 oz with 1 quart DI water?
Answer
The specific gravity after combining the two will be 1.00.

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