Page 1
Series V6 Flotect® Flow Switch
FRONT VIEW DETAIL SIDE VIEW DETAIL
LOCKWASHER
OR
Specications - Installation and Operating Instructions
Bulletin E-22
The Series V6 Flotect® Flow Switch is an inexpensive, explosion-proof ow switch
for use on air, water or other compatible gases and liquids. Three congurations are
available - 1. Factory installed in a tee. 2. With a trimmable vane for eld adjustment
and installation in a suitable tee. 3. Low ow models with an integral tee and adjustable
valve. All are available with an optional enclosure which is UL and CSA listed, or
Directive 2014/34/EU (ATEX) compliant for
2813 II 2 G Ex db IIC T6 Gb
Process Temp≤75°C or IECEx compliant for Ex db IIC T6 Gb Process Temp ≤ 75°C.
INSTALLATION
Unpack and remove any packing material found inside lower housing or tee.
Switch can be installed in any position but the actuation/deactuation ow rates in the
charts are based on horizontal pipe runs and are nominal values. For more precise
settings, units can be factory calibrated to specic ow rates.
V6 Models with Tee are supplied in 1/2˝ - 2˝ NPT sizes. Install in piping with arrow
pointing in direction of ow.
V6 Low Flow Models have 1/2˝ NPT connections and are eld adjustable. Install in
piping with arrow pointing in direction of ow. To adjust, loosen the four socket head
cap screws on bottom. The adjustment valve rotates 90° between “O” (open) and “C”
(closed). See ow charts for approximate ranges. Tighten screws once the required
ow rate has been set.
V6 with Field Trimmable Vane. These models enable the installer to choose
approximate actuation/deactuation points by trimming the full size vane at appropriate
letter-designated marks on a removable template. Flows are dened in the following
charts. Note that the charts are based on either brass or cast iron reducing tees or
stainless or forged steel straight tees with bushings where necessary. Install in piping
with arrow pointing in direction of ow.
When bushings are used, they must be back drilled to allow proper clearance for
unrestricted vane travel. Bore the I.D. to 13/16˝ (20 mm) on 1/2˝ x 3/4˝ bushings or 1˝
(25 mm) on larger bushings. The depth of the bore must leave internal threads 9/16˝
(14 mm) high for proper engagement between the lower housing of the switch and the
bushing. Check for proper vane travel and switch operation after installation.
ELECTRICAL CONNECTIONS
Connect wire leads in accordance with local electrical codes and switch action
required. N.O. contacts will close and N.C. contacts will open when ow increases
to the actuation point. They will return to “normal” condition when ow decreases to
the deactuation point. Black = Common, Blue = Normally Open and Red = Normally
Closed.
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. Some CSA listed models are
furnished with a separate green ground wire. Such units must be equipped with a
junction box, not supplied but available on special order.
SPECIFICATIONS
Service: Gases or liquids compatible with wetted materials.
Wetted Materials: Standard V6 models: Vane: 301 SS; Lower body: Brass or 303
SS; Magnet: Ceramic; Other: 301, 302 SS; Tee: Brass, iron, forged steel, or 304 SS.
V6 low ow models: Lower body: Brass or 303 SS; Tee: Brass or 304 SS; Magnet:
Ceramic; O-ring: Buna-N standard, uoroelastomer optional; Other: 301, 302 SS.
Temperature Limits: -4 to 220°F (-20 to 105°C) Standard, MT high temperature
option 400°F (205°C) (MT not UL, CSA, ATEX, IECEx or KC) ATEX compliant AT,
IECEx IEC option and KC (KC option); Ambient temperature -4 to 167°F (-20 to
75°C); Process temperature: -4 to 220°F (-20 to 105°C).
Pressure Limit: Brass lower body with no tee models 1000 psig (69 bar), 303 SS
lower body with no tee models 2000 psig (138 bar). Brass tee models 250 psi (17.2
bar), iron tee models 1000 psi (69 bar), forged and SS tee models 2000 psi (138
bar), low ow models 1450 psi (100 bar).
Enclosure Rating: Weatherproof and explosion-proof. Listed with UL and CSA for
Class I, Groups A, B, C and D; Class II, Groups E, F, and G. (Group A on SS body
models only).
2813 II 2 G Ex db IIC T6 Gb Process Temp≤75°C Alternate Temperature
Class T5 Process Temp≤90°C, 115°C (T4) Process Temp ≤105°C consult factory.
EU-Type Certicate No.: KEMA 04ATEX2128.
ATEX Standards: EN 60079-0: 2011 + A11:2013; EN 60079-1: 2014.
IECEx Certied: For Ex db IIC T6 Gb Process Temp≤75°C Alternate Temperature
Class T5 Process Temp≤90°, 115°C (T4) Process Temp≤105°C consult factory.
IECEx Certicate of Conformity: IECEx DEK 11.0039; IECEx standards: IEC
60079-0: 2011; IEC 60079-1: 2014; Korean Certied (KC) for: Ex d IIC T6 Gb
Process Temp≤75°C; KTL Certicate Number: 12-KB4BO-0091.
Switch Type: SPDT snap switch standard, DPDT snap switch optional.
Electrical Rating: UL models: 5 A @125/250 VAC. CSA, ATEX and IECEx models:
5 A @ 125/250 VAC (V~); 5 A res., 3 A ind. @ 30 VDC (V ). MV option: 0.1 A @
125 VAC (V~). MT option: 5 A @125/250 VAC (V~). [MT option not UL, CSA, ATEX
or IECEx].
Electrical Connections: UL models: 18 AWG, 18˝ (460 mm) long. ATEX/CSA/
IECEx models: Terminal block.
Upper Body: Brass or 303 SS.
Conduit Connections: 3/4˝ male NPT standard, 3/4˝ female NPT on junction box
models. M25 x 1.5 with BSPT option.
Process Connection: 1/2˝ male NPT on models without a tee.
Mounting Orientation: Switch can be installed in any position but the actuation/
deactuation ow rates in the charts are based on horizontal pipe runs and are
nominal values.
Set Point Adjustment: Standard V6 models none. Without tee models vane is
trimmable. Low ow models are eld adjustable in the range shown. See set point
charts on opposite page.
Weight: 2 to 6 lb (.9 to 2.7 kg) depending on construction.
Options not Shown: Custom calibration, bushings, PVC tee, reinforced vane,
DPDT relays.
CONDUCT
SCREW
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
Phone: 219-879-8000
Fax: 219-872-9057
CLAMP
www.dwyer-inst.com
e-mail: info@dwyermail.com
Page 2
EU-Type Certicate, IECEx and KC Installation Instructions:
Cable Connection
The cable entry device shall be certied in type of explosion protection ameproof
enclosure “d”, suitable for conditions of use and correctly installed. For Ta ≥ 65°C cable
and cable gland rated ≥ 90°C shall be used.
Conduit Connection
An Ex d certied sealing device such as a conduit seal with setting compound shall be
provided immediately to the entrance of the valve housing. For Ta ≥ 65°C wiring and
setting compound, in the conduit seal, rated ≥ 90°C shall be used.
Note: ATEX, IECEx and KC 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 ≤75°C. Units may be used in process temperatures up
to 105°C providing the enclosure and switch body temperature do not exceed 75°C.
The standard Temperature Class is T6 Process Temp ≤75°C. Alternate Temperature
Class of T5 Process Temp ≤90°C and 115°C (T4) Process Temp ≤105°C are available
consult factory.
Refer to Certicate No: IECEx DEK 11.0039 for conditions of safe use for
IECEx compliant units.
All wiring, conduit and enclosures must meet applicable codes for hazardous areas.
Conduits and enclosures must be properly sealed. For outdoor or other locations
where temperatures vary widely, precautions should be taken to prevent condensation
inside switch or enclosure. Electrical components must be kept dry at all times.
CAUTION
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.
To prevent ignition of hazardous atmospheres, disconnect the
device from the supply circuit before opening. Keep assembly
tightly closed when in use.
V6 With Tee
Cold Water - Factory Installed Tee
Approximate actuation/deactuation low Rates
GPM upper, M3/HR lower
1/2˝ NPT 3/4˝ NPT 1˝ NPT 1-1/4˝ NPT 1-1/2˝ NPT 2˝ NPT
1.5 1.0
0.34 0.23
Air-Factory Installed Tee
Approximate actuation/deactuation ow rates
SCFM upper, NM3/M lower
2.0 1.25
0.45 0.28
3.0 1.75
0.68 0.40
4.0 3.0
0.91 0.68
1/2˝ NPT 3/4˝ NPT 1˝ NPT 1-1/4˝ NPT 1-1/2˝ NPT 2˝ NPT
6.5 5.0
.18 .14
V6 Low Flow, Field Adjustable
Cold Water - Low Flow Models
Approximate actuation/deactuation ow rates
GPM upper, M3/HR lower
10.0 8.0
.28 .23
14 12
.40 .34
21 18
.59 .51
Minimum Maximum
.04 .03
.009 .007
Air - Low Flow Models
Approximate actuation/deactuation ow rates
SCFM upper, NM3/M lower
.75 0.60
0.17 0.14
Minimum Maximum
.18 .15
.005 .004
2.70 2.0
.08 .06
MODEL CHART
Example V6 EP -BB -D -1 -B -AT V6EPB-B-D-1-B-AT
Series V6 Flotect
®
mini-size ow switch
Construction EP Explosion proof
Body BB
Switch Type D
Tee
Connection
Size
Tee Type and
Material
Options 18
*Options that do no have ATEX or IECEx.
**BSPT options not compatible with KC option.
Attention: Units without the “AT” sufx 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.
SS
S
1
2
3
4
5
6
LF
1E
2E
3E
4E
5E
6E
LFE
B
S
O
20
22
022A
31
AT
BUSH2
BUSH3
BUSH4
BUSH5
BUSH6
BUSH7
BUSH8
BUSH9
BUSH10
BUSH11
CSA
CV
FTR
GL
ID
IEC
JCTLH
KC
MT
MV
NN
ORFB
ORFS
PT
RV
ST
TBC
VIT
Brass
Stainless steel
DPDT
SPDT
1/2˝ NPT
3/4˝ NPT
1˝ NPT
1-1/4˝ NPT
1-1/2˝ NPT
2˝ NPT
Low ow with 1/2˝ NPT inlet and outlet
1/2˝ BSPT**
3/4˝ BSPT**
1˝ BSPT**
1-1/4˝ BSPT**
1-1/2˝ BSPT**
2˝ BSPT**
Low ow with 1/2˝ BSPT inlet and outlet**
Brass
Stainless steel
No tee with eld trimmable vane
0.018 spring for low ow
.020 spring for low ow
.022 spring for low ow
.022 spring for low ow with alnico magnet
.031 spring for low ow
ATEX approval
1/2˝ NPT x 3/4˝ NPT bushing
1/2˝ NPT x 1˝ NPT bushing
1/2˝ NPT x 1-1/4˝ NPT bushing
1/2˝ NPT x 1-1/2˝ NPT bushing
1/2˝ NPT x 2˝ NPT bushing
1/2˝ BSPT x 3/4˝ BSPT bushing, M25 X 1.5 conduit connection**
1/2˝ BSPT x 1˝ BSPT bushing, M25 X 1.5 conduit connection**
1/2˝ BSPT x 1-1/4˝ BSPT bushing, M25 X 1.5 conduit connection**
1/2˝ BSPT x 1-1/2˝ BSPT bushing, M25 X 1.5 conduit connection**
1/2˝ BSPT x 2˝ BSPT bushing, M25 X 1.5 conduit connection**
CSA*
Custom vane
Flow test report
Ground lead*
Custom nameplate
IECEx approval
Junction box with left side conduit
Korean certied
High temperature*
Gold contacts
No nameplate*
Brass orice
Stainless steel orice
Paper tag
Reinforced vane
Stainless steel tag
Terminal lock connector*
Flouroelstomer seals
6.0 5.0
1.36 1.14
33 30
.93 .85
10.0 8.5
2.27 1.93
43 36
1.19 1.02
Page 3
V6 With Field Trimmable Vane
Cold Water - Brass or Cast Iron Reducing Tee
Approximate actuation/deactuation ow rates
GPM upper, M3/HR lower
Air - Brass or Cast Iron Reducing Tee
Approximate actuation/deactuation ow rates
SCFM upper, NM
3
/M lower
Vane 1/2˝ NPT 3/4˝ NPT 1˝ NPT 1-1/4˝ NPT 1-1/2˝ NPT 2˝ NPT
Full Size 9.0 8.5
a 9.5 9.0
b 10.0 9.3
c 11.0 10.0
d 6.2 5.5
e 7.0 6.5
f 4.3 3.9
g 4.9 4.4
h 5.5 5.0
i 3.5 3.1
j 4.0 3.5
k 4.6 4.2
l 2.6 2.3
m 1.6 1.3
n 2.2 1.8
o 3.0 2.4
0.4 0.3
0.5 0.4
0.7 0.5
0.6 0.5
3.5 3.1
0.8 0.7
4.3 3.8
1.0 0.9
0.8 0.7
0.9 0.8
1.04 0.95
5.6 5.2
1.3 1.2
6.3 6.1
1.43 1.39
8.0 7.5
1.8 1.7
1.0 0.9
1.1 1.0
1.2 1.1
6.0 5.6
1.4 1.3
7.0 6.6
1.6 1.5
8.0 7.6
1.8 1.7
10.0 9.0
2.3 2.0
12.0 10.0
2.7 2.3
1.4 1.2
1.6 1.5
7.6 7.1
1.7 1.6
8.0 7.3
1.8 1.7
9.0 8.2
2.0 1.9
10.0 9.0
2.3 2.0
13.0 11.0
3.0 2.5
15.0 13.0
3.4 3.0
2.0 1.9
2.2 2.0
2.3 2.1
2.5 2.3
12.0 10.0
2.7 2.3
13.0 11.0
3.0 2.5
14.0 12.0
3.2 2.7
Vane 1/2˝ NPT 3/4˝ NPT 1˝ NPT 1-1/4˝ NPT 1-1/2˝ NPT 2˝ NPT
Full Size 39.0 37.0
a 40.0 38.0
b 42.0 40.0
c 50.0 44.0
d 27.0 25.0
e 30.0 28.0
f 20.0 18.0
g 21.0 19.0
h 23.0 21.0
i 16.0 15.0
j 18.0 16.0
k 19.0 17.0
l 13.0 12.0
m 6.4 3.8
n 10.0 7.0
o 12.0 9.0
0.18 0.11
0.28 0.20
0.34 0.25
0.37 0.34
15.0 14.0
0.42 0.40
20.0 16.0
0.57 0.45
0.45 0.42
0.51 0.45
0.54 0.48
22.0 20.0
0.62 0.57
25.0 23.0
0.71 0.65
32.0 28.0
0.91 0.79
0.57 0.51
0.59 0.54
0.65 0.59
24.0 22.0
0.68 0.62
28.0 25.0
0.79 0.71
33.0 30.0
0.93 0.85
38.0 35.0
1.08 0.99
45.0 42.0
1.27 1.19
0.76 0.71
0.85 0.79
32.0 30.0
0.85 0.79
32.0 30.0
0.91 0.85
34.0 32.0
0.96 0.91
37.0 34.0
1.05 0.96
39.0 36.0
1.10 1.02
51.0 45.0
1.44 1.27
69.0 57.0
1.95 1.61
1.10 1.05
1.13 1.08
1.19 1.13
1.42 1.25
55.0 46.0
1.56 1.30
Cold Water - Stainless or Forged Steel Straight Tee and Bushing
Approximate actuation/deactuation ow rates
GPM upper, M
3
/HR lower
Vane 1/2˝ NPT 3/4˝ NPT 1˝ NPT 1-1/4˝ NPT 1-1/2˝ NPT 2˝ NPT
Full Size 5.0 4.5
a 5.5 5.0
b 6.2 5.7
c 6.8 6.3
d 2.8 2.4
e 3.4 3.0
f 4.0 3.6
g 2.0 1.5
h 2.5 2.0
i 3.5 3.0
j 7.0 5.5
k 10.0 8.0
0.5 0.3
0.6 0.5
0.8 0.7
1.6 1.2
2.3 1.8
0.6 0.5
0.8 0.7
0.91 0.82
5.0 3.6
1.1 1.0
6.5 6.1
1.48 1.39
9.0 8.2
2.0 1.9
1.1 1.0
1.2 1.1
1.4 1.3
1.5 1.4
8.5 7.8
1.9 1.8
10.0 9.2
2.3 2.1
12.0 10.0
2.7 2.3
8.5 7.8
1.9 1.8
9.2 8.6
2.1 2.0
9.8 9.0
2.2 2.0
12.0 10.0
2.7 2.3
13.0 11.0
3.0 2.5
Air - Stainless or Forged Steel Straight Tee and Bushing
Approximate actuation/deactuation ow rates
SCFM upper, NM3/M lower
Vane 1/2˝ NPT 3/4˝ NPT 1˝ NPT 1-1/4˝ NPT 1-1/2˝ NPT 2˝ NPT
Full Size 21.0 18.0
a 22.0 20.0
b 24.0 22.0
c 28.0 26.0
d 12.0 10.0
e 14.0 12.0
f 16.0 14.0
g 8.0 6.5
h 11.0 10.0
i 14.0 13.0
j 27.0 24.0
k 39.0 36.0
0.23 0.18
0.31 0.28
0.40 0.37
0.76 0.68
1.10 1.02
0.34 0.28
0.40 0.34
0.45 0.40
19.0 17.0
0.54 0.48
26.0 24.0
0.74 0.68
32.0 30.0
0.91 0.85
0.59 0.51
0.62 0.57
0.68 0.62
0.79 0.74
33.0 30.0
0.93 0.85
37.0 34.0
1.05 0.96
43.0 40.0
1.22 1.13
33.0 30.0
0.93 0.85
39.0 36.0
1.10 1.02
42.0 38.0
1.19 1.08
51.0 46.0
1.44 1.30
55.0 50.0
1.56 1.42
Page 4
DIMENSIONS
3/4˝ NPT
[136.5]
"A"
3-3/8 [85.72] DIA.
T
[235.0]
"A"
3-3/8 [85.72] DIA.
1/2˝ FEMALE NPT
GROUND
[1
NPT
1/2˝ FEMALE
.625
[47.62]
5-13/16
[147.69]
LOWER HOUSING-BRASS
DPDT
Series V6 Flotect
3-15/16
[100.0]
4-1/2
14.3]
INLET
1/2˝ FEMALE
®
Flow Switch
3-5/8 [92.07]
V6 low ow
3/4˝ NPT
1-1/8 SQ.
[28.57]
OUTLET
NPT
13/16 [20.63]
EXTERNAL
3/4˝ FEMALE NPT
7.250
[184.2]
6-1/8
1-1/8 SQ.
[28.57]
[155.5]
OUTLET
1/2˝ FEMALE
NPT
8-5/8
[219.1]
INLET
V6 low ow with CSA, IECEx, ATEX conduit enclosure
3-5/8 [92.07]
LOCKING COLLAR
ASSEMBLY
3/4 NPT
UPPER HOUSING
SWITCH SUPPORTS
SPDT (OR DPDT)
SNAP SWITCH
MAGNET LEVER PIN
MAGNET LEVER
ASSEMBLY
MAGNETS
OR STAINLESS STEEL
VANE SPRING
VANE PIVOT PIN
VANE PIVOT BRACKET
SNAP RING
1/2 NPT
STAINLESS
STEEL VANE
OVERALL LENGTH WITH
1-1/4˝ TEE CONNECTION
APPROXIMATELY 8˝
V6 with eld
trimmable vane
Brass/Ductile Iron Forged/Stainless Steel Malleable Iron
Pipe
Size
Dim. A Dim. B Dim. A Dim. B Dim. A Dim. B
1/2˝
2-1/4 [57]
3/4˝
2-3/8 [60]
1˝
2-1/2 [64]
1-1/4˝
2-5/8 [67]
1-1/2˝
2-7/8 [73]
2˝
3 [76]
1-1/8 [29]
1-1/4 [32]
1-3/8 [35]
1-1/2 [38]
1-5/8 [41]
1-7/8 [48]
5-3/8
"B"
V6 with tee
2-1/4 [57]
2-5/8 [67]
3 [76]
3-1/2 [89]
4 [102]
4-3/4 [121]
1-1/8 [29]
1-7/8 [47]
2-1/8 [54]
2-1/2 [64]
2-3/4 [70]
3-1/8 [79]
2-1/2 [64]
2-5/8 [67]
2-7/8 [73]
3 [76]
3-1/4 [83]
3-1/2 [89]
1-1/4 [32]
1-3/8 [35]
1-1/2 [38]
1-3/4 [44]
1-7/8 [48]
2-1/8 [54]
9-1/4
"B"
V6 with tee and CSA, IECEx, ATEX
conduit enclosure
13/16 [20.63]
3/4 FEMALE NP
[15.87]
1.875
Trimmable vane
SPDT
Terminal connections
CSA, IECEx, ATEX enclosures
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
Printed in U.S.A. 8/21 FR# 440805-00 Rev. 18©Copyright 2021 Dwyer Instruments, Inc.
Phone: 219-879-8000
Fax: 219-872-9057
www.dwyer-inst.com
e-mail: info@dwyermail.com
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