Dwyer 250-AF User Manual download pdf (Page 2)

DWYER INSTRUMENTS, INC.

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

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: 219/872-9057 e-mail: [email protected]

Bulletin C-11

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INSTALLATION

1. Select a convenient location and drill two 1/2˝ (12.7 mm) holes “E”

inches/centimeters apart on a horizontal line. Mount the gage with the

toggle bolt assemblies, adjust to a level position as indicated by the

spirit level, and tighten securely.

2. Drill two 7/16˝ (11.1 mm) holes in the duct, one on each side of the

filter and at least 12˝ (30.48 cm) distant. Secure the static pressure tips

as in the drawing above, with the tips directed into the air flow.

3. Connect 1/4˝ (6.35 mm) metal tubing from static pressure tips to the

gage. The tip on the downstream or fan side of the filter leads to the

right-hand gage connection, etc.

4. Slip out both gage connector plugs, venting both sides of the gage to

atmosphere, and slide scale so that the zero mark lies directly behind

the fluid meniscus, as in the drawing. Align fluid meniscus and the

reflected image to eliminate parallax error.

5. Add or remove fluid as necessary.

6. Replace both gage connector plugs, and the gage will indicate the

pressure drop across the filter.

7. Filter manufacturers provide figures covering the pressure drop

through their filters, at rated volume, when new and after use. Thus, for

a typical filter, initial resistance might be .25˝ of water (62.05 Pa) and

permissible increase .30˝ water (74.46 Pa). Such a filter should be

serviced at a gage reading of .55˝ water (136.5 Pa).

CAUTION:

Use Dwyer Instruments, Inc. gage fluid only. Clean with soap and water

only. Other fluids or cleaning agents may damage the gage.

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Dwyer 250-AF User Manual Page 2