Dwyer Instruments Series V8 Installation and Operating Instructions

Series V8 Flotect® Flow Switch

9 3/8 [238]

By Dwyer

Specications - Installation and Operating Instructions

[3] 18 AWG LEAD WIRES, 18 [460] LONG

1.650 DIA. [42]

Bulletin E-25

1/2 NPTM

INSTALLATION

1. The Model V8 Flow Switch is intended for use in clean, compatible process media free from scale, debris and other foreign matter which might collect on the vane and impede its movement. Buildup from such materials will prevent proper operation.

2. Carefully unpack the switch being certain to remove any packing material which might have become lodged between the switch housing and the vane assembly. Note the pipe size indicators molded into the vane. By trimming at the mark corresponding

to the pipe size being used, approximate actuation/deactuation ows will be as shown

in the charts at right. These values apply to installations with a thred-o-let, branch

connection or plastic tting. If using standard 125-250 lb. bronze, iron or steel ttings, trim the vane 0.125˝ above the mark. Due to variations in ttings and amount of thread

engagement, vane must be checked for proper operation.

3. The ow switch must be properly indexed during installation. The arrow on the side must point in the direction of ow.

4. Use Teon

mounting connection. Avoid excess sealant which could interfere with vane movement

and prevent proper operation. Do not exceed 50 ft/lbs (40 n/m) torque on the switch

housing. Damage can result.

5. Wire in accordance with local electrical codes. Lead wire colors are as follows:

Black - Common, Red - Normally Open, Blue - Normally Closed. Normal is the contact

condition with no ow in the system. Closed contacts open and open contacts close when increasing ow reaches the actuation point.

6. Switch electrical components must be protected from moisture at all times. If

necessary, install a lightweight waterproof junction box over the 1/2˝ NPT threaded

stem. Do not place mechanical loading on the switch housing. Permanent damage can

occur. Use exible Romex sheathing or equivalent.

thread tape or other suitable pipe joint compound to seal the 1˝ NPT

3 1/16

[78]

5 1/4

[134]

TRAVEL

SPECIFICATIONS Maximum Temperature: 212°F (100°C). Maximum Pressure: 150 psig (10.3 bar). Process Connection: 1˝ NPTM. Conduit Connection: 1/2˝ male NPT, 1/2˝ female NPT on WP and WP2. Switch Type: SPDT snap switch; MV option: SPDT gold contact snap switch. Electrical Rating: 5 A @ 125/250 VAC. MV Option: 0.1 A @ 125 VAC. Wire Leads: 18 AWG x 18 in (45.7 cm). Overall Length: 9.375 in (23.8 cm). Switch Body: Polyphenylene sulphide (PPS). Wetted Materials: Polyphenylene sulphide, ceramic 8 magnet, 316 stainless steel. Vane: Field trimmable. Mounting Orientation: Actuation/deactuation ow rates are based on horizontal

pipe runs and are nominal values. Unit cannot be used with vertical down ow.

Weight: 4.5 oz (128 g).

Cold water Flow Rates Air Flow Rates Approx. Actuation/Deactuation GPM Upper, LPM Lower

Pipe Size Pipe Size

1˝

1-1/4˝

1-1/2˝

2˝

3˝

4˝

6˝

10.8/9.1

40.9/34.6

9.8/8.3

37.2/31.4

8.6/6.8

32.4/25.7

10.9/8.8

41.2/33.4

12.9.8.9

48.8/33.5

21.1/13.8

79.7/52.2 45/33

170.2/124.7

Approx. Actuation/Deactuation SCFM Upper, NM

1˝

1-1/4˝

1-1/2˝

2˝

3˝

4˝

6˝

SWITCH BODY

1 5/16 [34] OCTAGO

1 NPTM

FIELD TRIMMABLE VANE

/H Lower

39/32.6

66.3/55.4

37.5/32.2

63.7/54.7

33.4/26.7

56.7/45.4

43/36.8

73.1/62.5

52.7/38.9

89.6/66

87.6/63.6

148.9/108.1

168.6/137.4

286.5/233.4

W.E. ANDERSON

A DIVISION OF DWYER INSTRUMENTS, INC.