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

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Models & Ordering

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Wall Mount - Inches of Water/Mercury
Wall Mount - Inches of Gage Fluid
Panel Mount - Inches of Water/Mercury
Panel Mount - Inches of Gage Fluid
Custom Built Products

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

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Model	Description	Usually Ships*	Price	Order
1230-12-W/M Ships: 3-4 Weeks Price: $492.00	Well-type manometer, range 0-12, 14 oz mercury required.	3-4 Weeks*	$492.00	Order
1230-16-W/M Ships: 3-4 Weeks Price: $522.00	Well-type manometer, range 0-16, 16 oz mercury required.	3-4 Weeks*	$522.00	Order
1230-20-W/M Ships: 3-4 Weeks Price: $535.00	Well-type manometer, range 0-20, 18 oz mercury required.	3-4 Weeks*	$535.00	Order
1230-24-W/M Ships: 3-4 Weeks Price: $558.00	Well-type manometer, range 0-24, 20 oz mercury required.	3-4 Weeks*	$558.00	Order
1230-8-W/M Ships: 3-4 Weeks Price: $464.00	Well-type manometer, range 0-8, 12 oz mercury required.	3-4 Weeks*	$464.00	Order

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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
A-101	1 oz dispenser bottle of red gage fluid, .826 sp. gr.	Same Day	$10.50	Order
A-102	4 oz bottle of red gage fluid, .826 sp. gr.	Same Day	$20.50	Order
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
A-126	1 oz dispenser bottle fluorescein green color concentrate.	Same Day	$16.00	Order
A-315	Gage connector, shutoff type, for 3/16" rubber tubing.	1-2 Weeks	$18.50	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	$0.50	Order
A-339	Adapter, brass, 1/8" NPT to 3/16" rubber and 1/8" ID plastic tubing.	Same Day	$5.40	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

Product Literature

Manuals

Instruction Manual

Catalog Pages

Series 1230/1235 Catalog Page

SDS

Approvals

RoHS Letter of Compliance

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.

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.

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