Dwyer VFLO User Manual

Bulletin F-VFLO

(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.

Venturi Flow Meter with Magnehelic®Gage

Specifications - Installation and Operating Instructions

VFLO Kit VF1 VF2 VF3 VF4 VF5

Line Size

1˝ FNPT

1.5˝ FNPT 2˝ FNPT 3˝ FNPT 4˝ FNPT

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 orientation. The meter comes in a horizontal left to right configuration. If a vertical orientation is required then the Magnehelic

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

gage must be

rotated 90° and remounted on bracket.

ØC

4.500 6

7.750 11

14.500

2.687

2.562

2.734

2.500 3 4

5.000

2.015

2.625

3.312

4.625

5.172

2.125

2.375

2.875 4

5.000

3.125

3.375

3.875

5.500

6.500

1.359 2

2.703 4

5.328

1.125

1.375

1.750

2.375

3.000

4.625

5.250

5.750 7

9.250

6.375

7.125

7.875

9.625

11.500

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).

2. The Magnehelic®gage can be mounted remotely from the meter. If this is done make sure to keep the Magnehelic Flow Tube assembly. Condensation may collect in the tube if it is below the gage and cause false readings.

gage above the Venturi

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

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

DWYER INSTRUMENTS, INC.

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

gage.

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.

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