Dwyer Instruments 250-AF Series Manual de usuario

Series 250-AF Inclined Manometer Air Filter Gages

Installation and Operating Instructions

Bulletin C-11

DWYER INSTRUMENTS, INC.

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

.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: 219/872-9057 e-mail: info@dwyer-inst.com

1-1/2

(3.81)

1-1/2

(3.81)

1-1/2

(3.81)

(5.08)

8-1/2

(21.59)

11-3/6

(28.89)

8-1/4

(20.96)

11-1/6

(28.26)

Model

250 - AF

250.5 - AF

251 - AF

252 - AF

350 - AF

209 - AF

260 - AF

Scale

Divisions

Inches (cm)

.02

(.05)

.01

(.025)

.01

(.025)

.02

(.05)

.10

(.254)

.02

(.05)

.02

(.05)

Scale

Length

Inches (cm)

5-1/2

(13.97)

(20.32)

5-1/2

(13.97)

(20.32)

4-1/2

(11.43)

(20.32)

5-1/2

(13.97)

Range Inches of

Water ( a)

.10 - 0 - 1.0

(24.82 - 248.9)

.10 - 0 - 1.0

(24.82 - 248.9)

.05 - 0 - .50

(12.41 - 124.1)

.20 - 0 - 2.0

(49.64 - 487.8)

0 - 4

(0 - 995.6)

.20 - 0 - 3.0

(49.64 - 746.7)

0 - 1.5

(0 - 372.9)

2-13/16

(7.14)

3-1/8

(7.94)

2-15/16

(7.46)

2-13/16

(7.14)

4-1/8

(10.48)

3-15/16

(10.00)

3-5/16

(8.41)

5-1/2

(13.97)

7-3/4

(19.69)

10-5/8

(26.99)

7-1/2

(19.05)

10-3/8

(26.35)

2-3/4

(6.99)

2-13/16

(7.14)

11-1/4

(28.58)

8-3/8

(21.27)

(17.78)

4-15/16

(12.54)

(5.08)

10-1/2

(26.67)

7-5/6

(19.37)

Vertical Manometer – Dimensions Not Shown

Dimensions – Inches (Centimeters)

Note: The drawing a ove shows standard connection at left and three-way

vent valve at right. If the optional vent valves are preferred, please note

that two are required.

AIR FLOW

13/16

[20.64]

1-5/16

[33.34]

[50.80]

[101.60]

www. .com information@itm.com1.800.561.8187

DWYER INSTRUMENTS, INC.

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

.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: 219/872-9057 e-mail: info@dwyer-inst.com

Bulletin C-11

Page 2

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 olt assem lies, adjust to a level position as indicated y 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 a ove, with the tips directed into the air flow.

3. Connect 1/4˝ (6.35 mm) metal tu ing 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 oth gage connector plugs, venting oth sides of the gage to

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

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 oth 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 e .25˝ of water (62.05 Pa) and

permissi le increase .30˝ water (74.46 Pa). Such a filter should e

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.

www. .com information@itm.com1.800.561.8187

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