Dwyer Instruments V4-SS-2-U-AT User manual

Series V4 Flotect® Vane Operated Flow Switch

3-11/32

CLEARANCE FOR
COVER REMOV

EXPLOSION-PROOF HOUSING WITH 3/4˝ [19.05 MM]

Specications - Installation and Operating Instructions

[84.93]

1-5/8 [41.28]

[171.45]

8

[203.20]

6-3/4

AL

4-11/16
[119.06]

1

[25.40]

2-23/32

[69.06]

UL AND CSA TYPE INCLUDES 16 GA LEADS,
6 [152.4] LONG. ATEX VERSION INCLUDES
TERMINAL BLOCK

FEMALE NPT OR BSPT CONDUIT CONNECTION

SWITCH BODY, SAE 72 BRASS OR 316 SS

1-1/2˝ [38.10 MM] MALE NPT OR BSPT
PROCESS CONNECTION
MAGNET KEEPER, 430 SS

VANE BLOCK, 316 SS
FIVE LAYER VANE 316 SS

DESIGNED FOR 1-1/2˝ TO 8˝ [38.10 TO 203.20 MM]
PIPES USABLE IN LARGER PIPE SIZES.

Bulletin E-71

Rugged and reliable the Flotect® V4 Vane Operated Flow Switch operates
automatically to protect equipment and pipeline systems against damage from

reduction or loss of ow. The V4 is time tested being installed in thousands of pipelines
and processing plants around the world. A unique magnetically actuated switching
design gives superior performance. There are no bellows, springs, or seals to fail.
Instead, a free-swinging vane attracts a magnet within the solid metal switch body,
actuating a snap switch by means of a simple lever arm.

FEATURES

• Leak proof body machined from bar stock

• Choice of custom vane calibrated for your application, Model V4, or eld adjustable
multilayer vane, Model V4-2-U (see set point chart on page 4)

• Weatherproof, designed to meet NEMA 4

• Explosion-proof (listing included in specications)

• Installs directly and easily into pipeline with a thredolet, tee, or ange (see
application drawings on page 4)

• Can be used in pipes 1-1/2˝ and up

• Electrical assembly can be easily replaced without removing the unit from
installation so that the process does not have to be shut down

• High pressure rating of 1000 psig (69 bar) with the brass body and 2000 psig (138
bar) with the 316 SS body

APPLICATIONS

• Protects pumps, motors and other equipment against low or no ow

• Controls sequential operation of pumps

• Automatically starts auxiliary pumps and engines

• Stops liquid cooled engines, machines and processing when coolant ow is

interrupted

• Shuts down burner when air ow through heating coil fails

• Controls dampers according to ow

Notes:

• Check all ratings given in the instructions and on the product to make sure that the

product is suitable for your application. Do not exceed electrical ratings, pressure
ratings, or temperature ratings of the product.

• Disconnect power supply before beginning installation to prevent possible
equipment damage or electrical shock.

MAINTENANCE

Inspect and clean wetted parts at regular intervals. The cover should be in place at all
times to protect the internal components from dirt, dust, and weather, and to maintain
hazardous location ratings. Disconnect device from the supply circuit before opening
to prevent ignition of hazardous atmosphere. Repairs to be conducted by Dwyer
Instruments, Inc. Units in need of repair should be returned to the factory prepaid.

SPECIFICATIONS
Service: Gases or liquids compatible with wetted materials.

Wetted Materials: Vane: 316 SS; Body: Brass or 316 SS standard; Magnet keeper:

430 SS standard, 316 SS optional; Options: Other materials also available, consult
factory (e.g. PVC, hastelloy, nickel, monel, titanium).
Temperature Limit: -4 to 275°F (-20 to 135°C) standard, MT high temperature
option 400°F (205°C) [MT option not UL, CSA, ATEX or IECEx] ATEX and IECEx
options, ambient temperature -4 to 163°F (-20 to 73°C); Process temperature -4 to
163°F (-20 to 73°C).
Pressure Limit: Brass body 1000 psig (69 bar), 316 SS body 2000 psig (138 bar),
optional 5000 psig (345 bar) available with 316 SS body and SPDT switch only.
Enclosure Rating: Weatherproof and explosion-proof. Listed with UL and CSA for
Class I, Groups C and D; Class II, Groups E, F, and G.
ATEX

-20°C≤Process Temp≤73°C.
EU-Type Certicate No.: KEMA 03 ATEX 2383.
ATEX Standards: EN60079-0: 2012 + A11: 2013; EN60079-1: 2014.

IECEx Certied: For Ex db IIB T6 Gb -20°C≤Tamb≤73°C. -20°C≤Process
Temp≤73°C.
IECEx Certicate of Conformity: IECEX DEK 11.0071.
IECEx Standards: IEC 60079-0: 2011; IEC 60079-1: 2014.
Zone I. Also FM approved.

Switch Type: SPDT snap switch standard, DPDT snap switch optional.
Electrical Rating: UL, FM, ATEX and IECEx models 10A @ 125/250 VAC (V~).

CSA models: 5A @ 125/250 VAC (V~); 5A res., 3A ind. @ 30 VDC (V
option: 1A @125 VAC (V~); 1A res., .5A ind. @ 30 VDC (V
125/250 VAC (V~). [MT and MV option not UL, CSA, FM, ATEX or IECEx].
Electrical Connections: UL and CSA models: 16 AWG, 6˝ (152 mm) long. ATEX or
IECEx unit: Terminal block.

Conduit Connection: 3/4˝ female NPT or M25 x 1.5 with -BSPT option.
Process Connection: 1-1/2˝ male NPT or 1-1/2˝ male BSPT.
Mounting Orientation: Within 5° of vertical for proper operation. Units for

horizontal installation (vertical pipe with up ow) available.

Set Point Adjustment: For universal vane: ve vane combinations.
Weight: 4 lb 8 oz (1.9 kg).

2813 II 2 G Ex db IIB T6 Gb -20°C≤Tamb≤73°C.

). MV

). MT option: 5A @

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MODEL CHART
Example V4 -SS -3 1 6 -C -F 2 S 1 V4-SS-316-C-F2S1
Construction V4 1 Brass body, SPDT switch
Construction Options SS

Magnet Keeper

Material Options
Vane Material Options 1

Body Material Options 1

Other Options AT

Flange* F Flange process connection
Flange Size 2

Flange Material C

Flange Rating 1

Bushing* B Bushing process connection
Bushing Size 1

Bushing Type H

Bushing Material B

Tee* T Tee process connection
Tee Size 1 1-1/2˝
Tee with Bushing* TB Tee with bushing process connection (both same material)
Tee Size 2

Tee Material and Type B0

*Options that do not have ATEX or IECEx.
Attention: Units without the “AT” sufx are not Directive 2014/34/EU (ATEX) compliant. These units are not intended for use in potentially

hazardous atmospheres in the EU. These units may be CE marked for other Directives of the EU.

2
D
U

1

3

2
3
4
5

2
3
4
5
6
7

BSPT
IEC
EPOXY
FSV
FTR

HP

HV
MT
MV
NACE
NB
NH
SW
TBC
TRD
TRI
V

2.5
3
4

2
4

3

316 SS body
Type 2 body style
DPDT switch
Universal vane (omit for a custom vane)

430 SS (standard)
316 SS

316 SS (standard)
Carpenter 20
Hastelloy B

Hastelloy C

Monel
Brass (standard)

Carpenter 20
CPVC*
Hastelloy B

Hastelloy C

316 SS (must also use SS construction selection)
Monel

ATEX
1-1/2˝ female BSPT process connection, M25 x 1.5 conduit connection
IECEx
Epoxy coated housing
Full swing vane
Flow test report
High pressure*, 5000 psi (345 bar) (only with SS body)

Hinged vane

High temperature* (see specications for rating)
Gold contact snap switch* (see specications for rating)
NACE heat treated body*
Neoprene boot*
No electrical housing*
Socket weld connection*
Terminal block wire connections*
Time delay relay* (on ow decrease)
Time delay relay* (on ow increase)
Vertical up ow applications

2˝
2-1/2˝
3˝
4˝

Carbon steel

S

316 SS

M

Monel

B

Hastelloy B

H

Hastelloy C

150#

3

300#

6

600#

9

900#

2˝
2-1/2˝
4˝

Hex

F

Flush
Brass

C

Carbon steel

S

316 SS

4

304 SS

2˝
3˝

Brass 125 #

B1

Brass 150 #

B2

Brass 250 #

C

Carbon steel 2000 # (only with 2˝ and 3˝)

CP

CPVC SCH 80

S

316 SS 150 #

P

PVC SCH 80

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INSTALLATION

LOCKWASHER

OR

3-11/32

1. Remove packing material from switch body-cap and remove tape from magnet
keeper. Adjust vane length if necessary on multi-layer vanes only (see ow rate
charts on next page). Install switch in thredolet previously welded to line. In some
cases, it may be necessary to install the switch in a ange or tee (see installation
drawings on next page). Note: extreme care must be exercised in welding the tting
to the line so that it is plumb and level.

Adjustment of Multi-layer Vane

Remove only those layers which are too long. Leave the smaller layers to reinforce
the vane. The longest vane ts 6˝ (150 mm) or larger pipe, the second longest vane
ts 4˝ (100mm) pipe, etc. Actuation-Deactuation rates are shown in the charts on
the next page. To remove vane layers, proceed as follows:

a. Remove the two screws and lockwashers holding the layers together. Do not
lose these special corrosion resistant type 316 stainless steel screws and
lockwashers.

b. Remove the unwanted layers.

c. Resecure the vane with the original two screws and lockwashers.

c1. If using a product with the 316 SS vane block option, a second pair of
screws are included in the package. Resecure the vane with the correct
screws per the below:

# of Vanes Used Use Screw Length

1,2
3, 4, 5

d. With a hammer, lightly peen the ends of the screws so that they can’t back out.

e. If you lose the screws or lockwashers, don’t replace with other parts which may
corrode and break. That will void the warranty and might cause severe
damage to equipment located downstream of the switch.

Note: Custom vane units have been calibrated at factory to meet requirements. Do
not change.

2. The arrow on the side of the switch must point in the direction of ow.

3. Wiring: UL and CSA units only: thread connecting wires through conduit and
connect. Wire in accordance with local electrical codes.
Black - Common
Blue - N.O.
Red - N.C.

Note: Double pole, double throw switches have dual black, blue and red leads.
These are connected in the same manner as single pole, double throw switches,
as described above.

ATEX and IECEx Installation Instructions
Cable Connection

The cable entry device shall be certied in type of explosion protection
ameproof enclosure “d”, suitable for conditions of use and correctly installed.
Cable entry may exceed 70°C. Conductors and cable gland rated ≥95°C shall
be used.

Conduit Connection

An Ex d certied sealing device such as a conduit seal with setting compound
shall be provided immediately to the entrance of the valve housing. Cable entry
may exceed 70°C. Conductors and cable gland rated ≥95°C shall be used.

Note: The switch is deactivated and contacts are in normal condition when there is
no ow in the line.

4. Make sure conduit or cable are properly sealed. Electrical components must be
kept free of moisture, including condensation, at all times.

Note: ATEX and IECEX units only: The temperature class is determined by the
maximum ambient and or process temperature. Units are intended to be used
in ambient of -20°C≤Tamb≤73°C. Units may be used in process temperatures up to
133°C providing the enclosure and switch body temperature do not exceed 73°C.
The standard Temperature Class is T6 Process Temp ≤73°C.

CAUTION

7/16˝ (included in box)
1/2˝ (pre-installed)

To prevent ignition of hazardous atmosphere, disconnect the
device from the supply circuit before opening. Keep assembly
tightly closed when in operation.

[84.93]

2-23/32

[69.06]

1-5/8 [41.28]
CLEARANCE FOR
COVER REMOVAL

3

4

B

A

5. For units supplied with both internal ground and external bonding terminals, the
ground screw inside the housing must be used to ground the control. The external
bonding screw is for supplementary bonding when allowed or required by local
code. When external bonding conductor is required, conductor must be wrapped a
minimum of 180° about the external bonding screw. See below.

Terminal Connections SPDT Terminal Connections DPDT

Ref # Standard V4 ATEX/IECEx

1

N/A

2

N/A

3

Explosion-proof housing with 3/4˝
female NPT conduit connection

4

16 AWG, 6˝ (152 mm) long

5

Internal

6

Magnet arm and switch assembly

7

Switch body of SAE 72 Brass or
316 SS

8

Five layer vane, 316 SS, designed
for 1/2˝ to 8˝ pipes. Usable in larger

pipe sizes

9

Magnet keeper of 430 SS

10

Vane block of 316 SS

C

D

1

[25.40]

E

G

F

Standard V4 ATEX/IECEx

Front view detail Side view detail

Dim V4 in [mm] V4-2 in [mm]

A

8-3/16 [207.96]

B

6 [152.40]

C

4-11/16 [119.06]

D

1 [25.40]

E

1-5/16 [33.34]

F

7/8 [22.23]

G

11/16 [17.46]

7

6

PROCESS CONNECTION

1-1/2 MALE NPT

9

10

8

SCREW

CLAMP

8 [203.20]
6-3/4 [171.45]
3-15/16 [100.01]
1-3/4 [44.45]
9/16 [14.30]
11/16 [17.63]
1/2 [12.70]

Cover lock.
External ground
Explosion-proof housing with 3/4˝
female NPT conduit connection

terminal block
Internal ground

Magnet arm and switch assembly
Switch body of SAE 72 Brass or
316 SS
Five layer vane, 316 SS, designed
for 1/2˝ to 8˝ pipes. Usable in larger

pipe sizes

Magnet keeper of 430 SS
Vane block of 316 SS

1

2

4

3

5

7

6

9

10

8

CONDUCT

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V4 UNIVERSAL VANE FLOW CHARTS

Values shown in both charts are nominal. If normal ows exceed actuation rates by
less than 10%, custom vanes are recommended. Figures are based on standard
vertical installation in a 1-1/2˝ thredolet in a horizontal run of pipe.

APPROXIMATE ACTUATION/DEACTUATION FLOW RATES FOR COLD WATER - UPPER FIGURES IN GPM. LOWER FIGURES IN LPM
Vane Layers 1.5˝ Pipe 2˝ Pipe 3˝ Pipe 4˝ Pipe 6˝ Pipe 8˝ Pipe 10˝ Pipe 12˝ Pipe 14˝ Pipe 16˝ Pipe 18˝ Pipe 20˝ Pipe

1

1 and 2

1, 2, and 3

1, 2, 3, and 4

1, 2, 3, 4, and 5

Note: Actuation rates are based on cold water at a specic gravity of 1.0. For uids of different specic gravity, actuation rates may be approximated by dividing the rate
shown by the square root of the specic gravity.

APPROXIMATE ACTUATION/DEACTUATION FLOW RATES FOR AIR - UPPER FIGURES IN SCFM. LOWER FIGURES IN LPS
Vane Layers 1.5˝ Pipe 2˝ Pipe 3˝ Pipe 4˝ Pipe 6˝ Pipe 8˝ Pipe 10˝ Pipe 12˝ Pipe 14˝ Pipe 16˝ Pipe 18˝ Pipe 20˝ Pipe

1

1 and 2

1, 2, and 3

1, 2, 3, and 4

1, 2, 3, 4, and 5

Note: Actuation rates are based on air at standard conditions. For gases at other pressures, temperatures, or specic gravities, consult factory for equivalent ow
approximations.

7-3

26.67-11.67

32-17
15-8

15-8

56.7-30

7-4

26.7-15

65-32
30-20

23-13
10-6

45-22
167-83.3

23-14

86.7-53.3

11-7

41.7-26.7

210-105
100-50

120-70
60-30

60-48
30-20

95-40
367-150

50-35
190-132

27-19
102-71.7

17-12
65-45

400-200
190-90

195-140
90-70

135-100
60-50

65-50
30-20

210-120
800-450

130-90
500-333

80-60
300-233

60-45
233-167

40-30
152-113

950-475
450-220

550-375
260-180

375-265
180-130

260-200
120-90

130-100
60-50

375-175
1417-667

230-150
867-567

160-115
600-433

120-90
450-333

80-65
300-250

1550-850
730-400

1100-700
520-330

725-500
340-240

500-400
240-190

310-250
150-120

600-300
2267-1133

450-250
1700-950

300-180
1133-683

230-150
867-567

135-100
517-383

2400-1300
1100-600

1850-1200
870-570

1200-850
570-400

875-700
410-330

650-525
310-250

900-450
3400-1700

650-350
2467-1317

450-275
1700-1033

310-200
1167-750

200-140
750-533

3450-1900
1600-900

2700-1750
1300-800

1850-1300
870-610

1250-1000
590-470

1000-800
470-380

1200-600
4550-2267

900-500
3400-1900

600-350
2267-1317

430-280
1633-1067

290-200
1100-750

4700-2600
2200-1200

3400-2200
1600-1000

2600-1800
1200-800

1900-1500
900-710

1600-1250
760-590

1400-800
5300-3033

1200-650
4550-2467

750-450
2750-2083

550-360
2083-1367

360-250
1367-950

6400-3500
3000-1700

4800-3100
2300-1500

3350-2350
1600-1100

2500-2000
1200-900

2200-1750
1040-830

2000-1000
7567-3783

1450-800
5483-3033

1000-600
3783-2267

700-450
2650-1700

460-325
1733-1233

8000-4400
3800-2100

6000-3900
2800-1800

4300-3000
2000-1400

3100-2500
1500-1200

2800-2250
1300-1100

2400-1200
9083-4550

1800-1000
6817-3783

1200-700
4550-2650

850-550
3217-2083

575-400
2183-1517

10000-5500
4700-2600

7400-4800
3500-2300

5300-3700
2500-1700

3900-3100
1800-1500

3550-2850
1700-1300

APPLICATION DRAWINGS FOR FLOTECT

1-1/2˝ THREDOLET

3/4 NPT

ANSI RF
THREADED
REDUCING

FLANGE

ANSI RF

WELDING

NECK

FLANGE

Standard Installation

FLOW

Flange Installation

CUT HOLE IN PIPE

1-15/16˝ [49.2MM] DIA MIN

*

*FLANGE FACE TO

PIPE O.D. SPECIFIED

BY CUSTOMER

NORMALLY SHOULD

NOT EXCEED

5˝ [127MM]

®

AUTOMATIC FLOW SWITCHES

FLOW

1-1/2˝ X 1-1/2˝ X 1-1/2˝

Tee Installation

FLOW

2˝ X 2˝ X 2˝

Tee Installation

2-1/2˝ X 1-1/2˝ FACE

2-1/2˝ THREADED

BRANCH

CONNECTION

2-1/2˝ Thredolet Installation

3/4 NPT

1-1/2˝ 3000 LB.

COUPLING

2-1/16˝ [52.4]

BORE I.D.

Line
Pipe
Size Dim A

2˝

2-5/8 [66.7]

3˝

2-1/2 [63.5]

4˝

2-7/16 [61.9]

coupling is bored out to 2-1/16˝ [52.4] as shown

Not recommended unless

OR HEX BUSHING

FACTORY INSTALLED

CUT HOLE IN PIPE

2-7/8˝ [73MM]

DIA MIN

1˝ [25.4]

A

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