Submittal Sheet

©Copyright 2020 Dwyer Instruments, Inc.
Printed in U.S.A. 8/20 DS-V4 Rev. 3
®
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DWYER INSTRUMENTS, INC.
Important Notice: Dwyer Instruments, Inc. reserves the right to make changes to or discontinue any product or service identied in this publication without notice. Dwyer advises its customers to obtain the
latest version of the relevant information to verify, before placing any orders, that the information being relied upon is current.
The Series V4 Flotect
®
Vane Operated Flow Switch is rugged and
reliable, ideal for automatically protecting equipment and pipeline
systems against damage from reduction or loss of ow. Time tested
in thousands of pipeline installations and processing plants around
the world this Series is Weatherproof, designed to meet NEMA 4 and
Explosion-proof (listing included in specications). This series can be
used in pipes 1-1/2˝ and up.
• Unique magnetically actuated switching design gives superior performance
• Features a free-swinging vane which attracts a magnet within the solid metal switch body, actuating a snap switch by means
of a simple lever arm with no bellows, springs, or seals to fail
• Leak proof body machined from bar stock
• Electrical assembly can be easily replaced without removing the unit from installation so that the process does not have to \
be shut down
•Installsdirectlyandeasilyintopipelinewithathredolet,tee,orange(seeapplicationdrawings)
•Highpressureratingof1000psig(69bar)withthebrassbodyand2000psig(138bar)withthe316SSbody
•Choiceofcustomvanecalibratedforyourapplication,ModelV4,oreldadjustablemultilayervane,ModelV4-2-U(seeset
 pointchart)
• 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
FEATURES/BENEFITS
DESCRIPTIONAPPLICATIONS
SERIES V4 | W.E. ANDERSON FLOTECT
®
VANE OPERATED FLOW SWITCH
HOW TO ORDER
SERIES
V4: Flotect
®
vane operated ow switch
BODY
-2: Short style brass body
-SS: 316 SS (with 430 SS magnet keeper)
VANE
-U: Universal
BLANK: Custom
HOUSING
BLANK: With housing
-NH: No housing (has no approvals)
OPTIONS
-D: DPDT contacts
-MV: Gold plated contacts, options for dry circuits*
-MT: High temperature, option rated 400°F (204°C)*
-TRI: Increasing ow time delay relay option with
2 SPDT contacts, adjustable from 0-1 to 0-31
minutes*
-TRD: Decreasing ow time delay relay option
with 2 SPDT contacts, adjustable from 0-1 to 0-31
minutes*
-316: 316 SS magnet keeper, option to replace
standard 430 SS
-V: Vertical up ow, option for upward ow in vertical
pipe
-AT: ATEX compliant construction
-IEC: IECEx certied construction
-BSPT: Male BSPT process connection and M25
conduit connection
*See electrical rating in specication, no listings or
approvals.
V4 -2 -U -NH -D
Use the bold characters from the chart below to construct a product code.
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 2813 II 2 G Ex db IIB T6 Gb -20°C≤Tamb≤73°C. -20°C≤Process Temp≤73°C. EU-Type Certicate No.:
KEMA 03ATEX2383. ATEX Standards: EN 60079-0:2012+A11:2013; EN 60079-1:2014. 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 10 A @ 125/250 VAC (V~). CSA models: 5 A @ 125/250 VAC (V~); 5 A res., 3 A ind. @ 30
VDC (V ). MV option: 1 A @125 VAC (V~); 1 A res., .5 A ind. @ 30 VDC (V ). MT option: 5 A @ 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 and IECEx unit: Terminal block.
Conduit Connection 3/4˝ female NPT standard or M25 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).
Agency Approvals ATEX, CE, CSA, FM, IECEx, UL**.
**No housing option (-NH) has no approvals.
DIMENSIONS
3-11/32
[84.93]
2-23/32
[69.06]
UL AND CSA TYPE
INCLUDES 16 GA LEADS,
6 [152.4] LONG.
ATEX VERSION INCLUDES
TERMINAL BLOCK
1-5/8 [41.28]
CLEARANCE FOR
COVER REMOV
AL
8
[203.20]
6-3/4
[171.45]
4-11/16
[119.06]
1
[25.40]
EXPLOSION-PROOF HOUSING
WITH 3/4 FEMALE NPT OR M2
5
CONDUIT CONNECTION
SWITCH BODY, SAE 72 BRASS
OR 316 STAINLESS STEEL
1-1/2 MALE NPT/BSPT
PROCESS CONNECTION
MAGNET KEEPER,
430 STAINLESS STEEL
VANE BLOCK,
316 STAINLESS STEEL
FIVE LAYER VANE 316
STAINLESS STEEL DESIGNED
FOR 1-1/2˝ TO 8˝ PIPES
USABLE IN LARGER PIPE
SIZES.