Dwyer VFLO Manuel d'utilisateur télécharger pdf

Bulletin F-VFLO

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: [email protected]

Specifications - Installation and Operating Instructions

Venturi Flow Meter with Magnehelic

Gage

The Venturi Flow Meter with Magnehelic

Gage is fabricated from

aluminum and has a gradual Venturi profile to reduce pressure losses

through the meter. Flexible connections enable the meter to be used in

vertical or horizontal applications. The Magnehelic

gage provides a

large, clear and accurate display of your differential pressure reading.

Each meter is calibrated at standard atmospheric conditions. The dual

scale reads in SCFM and in .w.c. The meter is supplied with flow

correction calculation sheet for various flow conditions. It is available in

line sizes from 1˝ to 4˝ and can handle vacuum and pressure

applications.

MOUNTING

Location:

The flow tube should be installed with minimum 8 diameters of pipe run

ahead and 5 diameters of pipe run after. This will ensure steady flow and

accurate readings.

Installation:

1. The meter can be installed in a vertical or horizontal position. The

Magnehelic

gage must be positioned such that it is read in a horizontal

orientation. The meter comes in a horizontal left to right configuration. If

a vertical orientation is required then the Magnehelic

gage must be

rotated 90° and remounted on bracket.

2. The Magnehelic

gage can be mounted remotely from the meter. If

this is done make sure to keep the Magnehelic

gage above the Venturi

Flow Tube assembly. Condensation may collect in the tube if it is below

the gage and cause false readings.

3. The Venturi Flow Tube must be connected in the correct orientation.

For example, in a left to right flow, the high pressure side which is on the

left connects to the high pressure port on the Magnehelic

gage. The low

pressure side is on the right and connects to the low pressure port of the

Magnehelic

gage.

SPECIFICATIONS

Service: Air and non-combustible, compatible gases. (Natural Gas

option available).

Wetted Materials: Aluminum, silicone, acrylic, polycarbonate, high

carbon steel, low carbon steel, brass, paper, acrylic paint, enamel paint,

alkyd coating, nickel plate, zinc plate, helsel FC, 300 series stainless

steel, PTFE, Loctite

AV sealant, commercial black rubber, neoprene,

samarium cobalt, nickel alloy steel cover, beryllium copper.

Housing: Die cast aluminum case and bezel, with acrylic cover. Exterior

finish is coated gray to withstand 168 hour salt spray corrosion test.

Accuracy: ± 2.5% FS.

Pressure Limits: -20˝ Hg to 15 psig (-0.677 bar to 1.034 bar); MP

option: 35 psig (2.41 bar). For applications with high cycle rate within

gage total pressure rating, next higher rating is recommended.

Overpressure: Relief plug opens at approximately 25 psig (1.72 kPa).

Temperature Limits: 20 to 140°F (-6.67 to 60°C).

Size: 4˝ (101.6 mm) diameter dial face.

Mounting Orientation: Diaphragm in vertical position. Consult factory

for other position orientations.

Process Connection: Female NPT of nominal line size (from 1˝ to 4˝ ).

Weight: Gage only: 1 lb 2 oz (510 g), MP & HP 2 lb 2 oz (963 g).

Venturi: 1˝: 3 lbs (1.36 kg); 1-1/2˝: 4.5 lbs (2.04 kg); 2˝: 6 lbs (2.72 kg);

3˝: 11 lbs (4.99 kg); 4˝: 18 lbs (8.16 kg).

MAINTENANCE

After final installation of the Venturi Flow Meter with Magnehelic

Gage,

no routine maintenance is required. A periodic check of system calibration

is suggested. These devices are not field repairable and should be

returned if repair is needed. Be sure to include a brief description of the

problem plus any relevant application notes. Contact customer service to

receive a return goods authorization number before shipping.

Note: Loctite® is a registered trademark of Henkel Corporation.

(A)

(F)

(E)

FLOW

(øC)

(B)

(ø4.750)

(D)

90° APPROX.

(G)

(H)

(.500)

(1.250)

(.687)

SIDE PORTS

PLUGGED

GAGE ASSEMBLY IS SHOWN

TO ILLUSTRATE MOUNTING

ORIENTATION WITH THE

VF KIT.

VFLO Kit

VF1

VF2

VF3

VF4

VF5

Line Size

1˝ FNPT

1.5˝ FNPT

2˝ FNPT

3˝ FNPT

4˝ FNPT

4.500

7.750

14.500

2.687

2.562

2.734

ØC

2.500

5.000

2.015

2.625

3.312

4.625

5.172

2.125

2.375

2.875

5.000

3.125

3.375

3.875

5.500

6.500

1.359

2.703

5.328

1.125

1.375

1.750

2.375

3.000

4.625

5.250

5.750

9.250

6.375

7.125

7.875

9.625

11.500

F-VFLO:TEMPLATE 5/28/09 10:40 AM Page 1

DWYER INSTRUMENTS, INC 1

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Page 1 - DWYER INSTRUMENTS, INC

Bulletin F-VFLODWYER INSTRUMENTS, INC.Phone: 219/879-8000 www.dwyer-inst.comP.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: 219/872-9057 e-ma

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Dwyer VFLO Manuel d'utilisateur

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