Dwyer Series 1420 Hook Gage User manual

Brand: Dwyer

Model: Series 1420 Hook Gage

Type: User manual

Dwyer Series 1420 Hook Gage is a transparent plastic device that is used to measure low pressure and vacuum. It has a large 2-1/2˝ diameter water column and is extremely sensitive, with an accuracy of plus or minus .001˝ w.c. for the full scale range of 0-2˝ of water. The gage is easy to use, with simplified action and only two moving parts. It is also very durable, with leak-proof stuffing boxes and a permanent accuracy. The Dwyer Series 1420 Hook Gage is a valuable tool for any industry that needs to measure low pressure or vacuum.

• Transparent plastic design - high visibility

with great strength

• Large 2-1/2˝ diameter water columns

• Leak-proof stuffing boxes

• Permanent accuracy

• Extremely sensitive level vial

Catalog No. 1420 Hook Gage is furnished complete with

Mounting panel, 3/4 oz. bottle Fluorescein Green Color

Concentrate and one set of Type “a” Connectors stated

below.

Type “a” - Two molded nylon tubing connectors, rapid shut

off type, two 3 ft. lengths flexible tygon plastic tubing, and

two 1/8˝ pipe thread adapters.

Type “b” - Two molded nylon tubing connectors, rapid shut

off type, one 9 ft. length rubber tubing and one brass ter-

minal tube.

Type “c” - Two 1/8˝ pipe thread openings.

Type “d” - Two compression fittings for 1/4˝ O.D. copper or

aluminum tubing.

Type “e” - Two 3-way vent valves, 1/8˝ S.P.T. to 1/4˝ metal

tubing, at additional cost.

Standard range is 0-2 water. Distilled water with a few drops

of Fluorescein color concentrate added is the indicating

fluid.

No. 1420 Hook Gage

Specifications - Installation and Operating Instructions

Bulletin D-55

DWYER INSTRUMENTS, INC.

Phone: 219/879-8000 www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: 219/872-9057 e-mail: info@dwyer-inst.com

Ø7/32 [5.53]

2 MOUNTING

HOLES

9-7/8

[250.83]

[228.60]

[76.20]

TYP

6-1/4

[158.75]

11-1/2

[292.10]

VACUUM

PRESSURE

4-1/8

[104.78]

The Dwyer No. 1420 Transparent Hook Gage was pri-

vately developed for certain critical low pressure and vacu-

um measurements in the Dwyer organization. Demands for

this precision instrument by other industries have now led

to its being placed on the market. The gage is completely

suitable for all applications except fluctuating pressures.

Fan manufacturers will find it useful in checking instruments

for measuring air flow. Builders of oil burners can make

exact laboratory draft tests. For all types of industrial test

work and in scientific laboratories, it affords a highly accu-

rate standard. The accuracy for the full scale range of 0-2˝

of water is within plus or minus .001˝ w.c.

Simplified action is the key to the Dwyer Hook Gage. The

effect of capillary attraction has been reduced to a mini-

mum by employing extra wide water columns. The only

moving parts are the two stainless steel hooks controlled by

standard depth micrometers. Passing through the leak-

proof stuffing box at the base, each hook shows the exact

level of its water column by producing a slight “pimple” at

the point of contact. After zero-setting of the hooks, the

pressure is applied and the resulting vertical movement of

the water is read directly from the micrometers.

With the extremely sensitive level vial, which is integral with

the base, the operator can locate one hook relative to the

other within .001 of an inch of vertical distance. These lev-

els have a sensitivity of 115-125 seconds for 2 mm of bub-

ble movement.

The depth micrometers are manufactured in accordance

with ASME B89.1.13-2001, and are traceable to a standard

at the National Institute of Standards and Technology.

D-55:D-55 7/10/09 10:32 AM Page 1

DWYER INSTRUMENTS, INC.

Phone: 219/879-8000 www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: 219/872-9057 e-mail: info@dwyer-inst.com

INSTALLATION

1. Select a vibration free location. Mount gage level, and

secure to a vertical surface, at a point slightly above eye

level, avoiding excessive heat (temperature over 135°F will

damage the gage).

2. Add several drops of fluorescein green color concentrate

to approximately 9 oz. of distilled water and mix gently.

Remove one connection plug, and add to gage until liquid

level is at the approximate mid point of the two columns. Be

certain no air is contained in the connecting tube between

the wells. Bleed by slightly loosening the machine screw

plug, if necessary.

3. Check level before using. Set both micrometers at zero

position by turning micrometer handles clockwise or

counter clockwise.

4. Loosen zero adjustment locking rings on both sides, and

turn hook handles until both hooks just dimple water sur-

face (see note at right). Lock zero adjustment locking rings,

making sure both micrometers still read zero.

5. Connect to left side for minus (below atmospheric) pres-

sures. Connect to right side for plus (above atmospheric)

pressures. Connect to both sides for differential pressures.

6. Impose pressure (plus, minus or differential) on gage, and

turn both micrometers until each hook again dimples the

water surface.

7. Read each micrometer, and add readings together.

8. Re-check level to insure gage has not moved during test.

NOTE: Experiment for best method of determining the

exact point when the hooks contact the water surface. With

care, repetitive accuracy of .001˝, is possible. A mirror or

polished chrome strip behind the wells is helpful. Light

should come from above and either side. Observing from

below, the bright mirror-like surface of the water will slightly

distort at the exact moment of contact.

CAUTION: Clean with soap and water, naphtha, or gaso-

line only. Other fluids or cleaning agents may damage the

gage. To clean, remove well cap fasteners and lift off well

cap.

D-55:D-55 7/10/09 10:32 AM Page 2

Dwyer Series 1420 Hook Gage User manual

Dwyer Series 1420 Hook Gage User manual

Dwyer Series 1420 Hook Gage User manual

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