Series 420 Durablock® Inclined/Vertical Manometer

Accuracy to ±0.25%

Dwyer® Series 420 Inclined-Vertical Manometer are extremely accurate instruments designed and made especially for precision measurement of low differential pressures in laboratory and test applications. The inclined range bore has a length of 20" to provide ample multiplication of indicating fluid movement in this critical lower part of the range.

NIST CALIBRATION available in Product Configurator.

Click here, if you require a Safety Data Sheet for the Blue Gage Fluid or the Red Gage Fluid.

Product Applications

Low pressure laboratory and test applications

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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

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Model	Description	Usually Ships*	Price	Order
421-10 Ships: 1-2 Weeks Price: $1,461.00	Inclined/vertical manometer, inclined range: 0-1.0" w.c., .01 min. div., 6-1/2" scale; vertical range 1.1-10" w.c., min. div. .10, 10-1/8" scale.	1-2 Weeks*	$1,461.00	Order
421-23 Ships: 1-2 Weeks Price: $1,897.00	Inclined/vertical manometer, inclined range: 0-2.2" w.c., .02 min. div., 6-1/8" scale; vertical range 2.4-23" w.c., min. div. .20, 10-1/4" scale.	1-2 Weeks*	$1,897.00	Order
421-5 Ships: 1-2 Weeks Price: $1,338.00	Inclined/vertical manometer, inclined range: 0-1.0" w.c., .01 min. div., 6-1/2" scale; vertical range 1.1-5" w.c., min. div. .10, 4-5/8" scale.	1-2 Weeks*	$1,338.00	Order
424-10 Ships: 1-2 Weeks Price: $2,661.00	Inclined/vertical manometer, inclined range: 0-2.0" w.c., .01 min. div., 20" scale; vertical range 2.1-10" w.c., min. div. .10, 9" scale.	1-2 Weeks*	$2,661.00	Order
424-5 Ships: 1-2 Weeks Price: $2,179.00	Inclined/vertical manometer, inclined range: 0-2.0" w.c., .01 min. div., 20" scale; vertical range 2.1-5" w.c., min. div. .10, 3-1/4" scale.	1-2 Weeks*	$2,179.00	Order

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Features

1-1/4" THICK ACRYLIC PLASTIC BODY is a solid block, virtually unbreakable, stable and absolutely free of the danger of distortion.
3/16" BORES, ACCURATE TO ± .0002" are permanently free of bends or crooks, will not require recalibration because of distortion.
GROUND GLASS BUBBLE LEVEL sensitive to 115-125 sec./2 MM. is 1-1/2" long x .375" diameter and provided with two red lines for easy visibility and alignment.
PARALLAX-FREE READING for maximum accuracy and consistency is achieved by simply aligning the meniscus with its image reflected in the polished aluminum scale.
SELECTED GAGE FLUID with high wetability characteristics forms a consistent, well shaped meniscus for perfect readability.
O-RING SEALED FLUID LEVEL PLUNGER ADJUSTMENT for easy zeroing.
PRECISION BUILT to assure device meets the highest standards.

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-110	1 oz dispenser bottle of blue gage fluid, 1.910 sp. gr.	Same Day	$194.00	Order
A-315	Gage connector, shutoff type, for 3/16" rubber tubing.	1-2 Weeks	$18.50	Order
A-339	Adapter, brass, 1/8" NPT to 3/16" rubber and 1/8" ID plastic tubing.	Same Day	$5.40	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

Model Chart

SERIES 421

EXAMPLE	421	5	B	Series 421-5-B Durablock® Inclined-Vertical Manometer, single column, 6-1/2" inclined scale, range 0-1" w.c. inclined and 1-5" w.c. vertical, with type B connections.
SERIES	421			Single Column, 6-1/2" Inclined Scale
RANGE		5 10 23 130MM 250MM 58CM		0-1" w.c. Inclined and 1-5" w.c. Vertical 0-1" w.c. Inclined and 1-10" w.c. Vertical 0-2" w.c. Inclined and 2-23" w.c. Vertical 0-25 mm w.c. Inclined and 30-130 mm w.c. Vertical 0-25 mm w.c. Inclined and 30-250 mm w.c. Vertical 0-5.5 cm w.c. Inclined and 7-58 cm w.c. Vertical
OPTIONS			B C D E AT NIST	Type B Connections Type C Connections Type D Connections Type E Connections Aluminum Tag NIST Certificate of Calibration

SERIES 422

EXAMPLE	422	10	AT	Series 422-10-AT Durablock® Inclined-Vertical Manometer, double column, 6-1/2" inclined scale, range 0-1" w.c. inclined and 1-10" w.c. vertical, with aluminum tag.
SERIES	422			Double Column, 6-1/2" Inclined Scale
RANGE		5 10 23 130MM 250MM 58CM		0-1" w.c. Inclined and 1-5" w.c. Vertical 0-1" w.c. Inclined and 1-10" w.c. Vertical 0-2" w.c. Inclined and 2-23" w.c. Vertical 0-25 mm w.c. Inclined and 30-130 mm w.c. Vertical 0-25 mm w.c. Inclined and 30-250 mm w.c. Vertical 0-5.5 cm w.c. Inclined and 7-58 cm w.c. Vertical
OPTIONS			B C D E AT NIST	Type B Connections Type C Connections Type D Connections Type E Connections Aluminum Tag NIST Certificate of Calibration

SERIES 424

EXAMPLE	424	132MM	NIST	Series 424-132MM-NIST Durablock® Inclined-Vertical Manometer, single column, 20" inclined scale, range 0-50 mm w.c. inclined and 52-132 mm w.c. vertical, with NIST certificate of calibration.
SERIES	424			Single Column, 20" Inclined Scale
RANGE		5 10 132MM 250MM		0-2" w.c. Inclined and 2-5" w.c. Vertical 0-2" w.c. Inclined and 2-10" w.c. Vertical 0-50 mm w.c. Inclined and 52-132 mm w.c. Vertical 0-50 mm w.c. Inclined and 52-250 cm w.c. Vertical
OPTIONS			B C D E AT NIST	Type B Connections Type C Connections Type D Connections Type E Connections Aluminum Tag NIST Certificate of Calibration

Product Literature

Manuals

Catalog Pages

Series 420 Catalog Page

SDS

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.

Related

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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.

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