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Model V10 Flotect® Mini-Size Flow Switch
By Dwyer
Specications - Installation and Operating Instructions
Bulletin E-26
INSTALLATION
1. Carefully unpack switch and remove any packing material from lower housing.
Trim the vane at the appropriate mark for the size of pipe being used. See actuation/
deactuation chart. CAUTION: Mechanical shock or vibration can cause permanent
damage to the reed switch. Take care to avoid dropping the unit on hard surfaces
or impacting the switch assembly.
2. Apply pipe thread sealant tape or pipe thread sealant to the 1/2˝ male NPT
mounting threads and install switch in the system piping with the arrow on side
pointing in the direction of ow.
3. Connect wiring in accordance with local electrical codes.
4. Inductive, capacitive and lamp loads can all create conditions harmful to the reed
switch.
a) Inductive loads can be caused by electromagnetic relays, electromagnetic
solenoids and electromagnetic counters, all with inductive components as the
circuit load.
b) Capacitive loads can be caused by capacitors connected in series with or
parallel to the reed switch. In a closed circuit the cable length (150 ft. or more) to
the switch can introduce a capacitance.
c) Lamp loads can be caused by switching lamp laments which have low cold
resistance.
In addition to these causes, exceeding any of the maximum electrical ratings can
lead to premature or immediate failure. This includes inrush and surge currents
greater than the maximum switching current. Use caution when evaluating system
loads and current. To accommodate these conditions, see diagrams on the reverse
which depict possible solutions.
5. After installation, set the switch action to NO (normally open) or NC (normally
closed). Normally closed contacts open and normally open contacts close when
increasing ow actuates the reed switch. To change, loosen, but do not remove,
the two screws on the top cap. Slide the reed switch assembly to expose the switch
action selected. Tighten screws when adjustment is complete.
MAINTENANCE/REPAIR
Upon nal installation of the Model V10, no routine maintenance is required. The
Model V10 is not eld serviceable and should be returned if repair is needed. Field
repair should not be attempted and may void warranty.
4 [101.6]
2-7/8 [73.07]
LOWER BODY
7/8 HEX
VANE
Normally
open position
SPECIFICATIONS
Service: Compatible gases or liquids.
Wetted Materials: Vane: 301 SS; Body: Brass or 303 SS; Pin and spring: 301 SS,
302 SS and 316 SS; Magnet: Ceramic 8.
Temperature Limit: 200°F (93°C).
Pressure Limit: Brass body: 1000 psig (69 bar); 303 SS body: 2000 psig (138 bar).
Enclosure Rating: Weatherproof, meets NEMA 4X (IP66).
Switch Type: SPST hermetically sealed reed switch. Field adjustable for normally
open or normally closed.
Electrical Rating: 0.5 A @ 120 VAC; 1.5 A @ 24 VDC res.; 0.001 A @ 200 VDC
res.
Electrical Connections: 18 AWG, 19˝ (483 mm) long, PVC jacket. Rated 221°F
(105°C).
Process Connection: 1/2˝ male NPT or 1/2˝ male BSPT.
Mounting Orientation: Switch can be installed in any position but the actuation/
deactuation ow rates are based on horizontal pipe runs and are nominal values.
Set Point Adjustment: Vane is trimmable.
Weight: 5.5 oz (0.16 kg).
Agency Approvals: CE, cUR, UR and CSA.
Switch Enclosure: Nylon.
COLD WATER FLOW RATES
APPROXIMATE ACTUATION/
DEACTUATION
GPM UPPER, LPM LOWER
Pipe
Size Trim N.O. N.C.
1/2˝
L
2.6/2.3
J
H
E
C
Full
9.8/8.7
3.1/2.7
11.7/10.2
4.8/4.5
18.2/17
6.2/5.6
23.5/21.2
8.2/7.7
31/29.1
9.5/9.1
36/34.4
3/4˝
1˝
1-1/4˝
1-1/2˝
2˝
18 AWG LEAD WIRES
19˝ [482.6] LONG
CABLE
2-7/8
[73.07]
2-3/8
[61.11]
2.6/2.5
9.8/9.5
3.1/2.8
11.7/10.6
4.8/4.4
18.2/16.7
6.1/5.6
23.1/21.2
8.2/7.7
31/29.1
9.5/9
36/34.1
1
[25.40]
1/4 [6.35]
TRAVEL TO
NORMALLY
CLOSED
POSITION
closed position
AIR FLOW RATES
APPROXIMATE ACTUATION/
DEACTUATION
SCFM UPPER, LPM LOWER
Pipe
Size Trim N.O. N.C.
1/2˝
L
10.3/8.8
J
H
E
C
Full
291.7/250
13/11.6
368.3/328
19.2/17.6
543.3/498
24.8/22.2
701.7/628
33.4/31.2
946.7/883
50.2/48.4
1422/1370
3/4˝
1˝
1-1/4˝
1-1/2˝
2˝
Normally
10.2/9.2
288/260
12.9/11.6
365/328
18.9/17.6
535/498
24.5/22.5
693/637
33/30.6
935/867
50.2/47.7
1422/1352
WARRANTY/RETURN
Refer to “Terms and Conditions of Sales” in our catalog and on our website. Contact
customer service to receive a Return Goods Authorization number before shipping the
product back for repair. Be sure to include a brief description of the problem plus any
additional application notes.
W.E. ANDERSON
A DIVISION OF
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
Phone: 219/879-8000
Fax: 219/872-9057
www.dwyer-inst.com
e-mail: info@dwyermail.com
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REED SWITCH PROTECTION CIRCUIT INFORMATION BULLETIN
READ INFORMATION BELOW BEFORE INSTALLING YOUR NEW REED SWITCH CONTROL!
Exceeding the current capacity of this Reed Switch control may cause FAULTY OPERATION! Be aware of the inductive and capacitive or lamp loads you may be placing on you
Reed Switch Control. The circuits below outline possible solutions to preventing overloads due to inrush or surge currents exceeding maximum or when the switch current and
product of the inductive back EMF exceed the switch’s power rating. Also the circuit for prevention of overload when switching lament lamps (low “cold” resistance) is outlined
below. Failure to follow these measures to protect Reed Switch Contacts may cause the contacts to weld together or result in premature wear.
POSSIBLE CIRCUIT SOLUTIONS INDICATED BY DASHED LINES
INDUCTIVE LOADS
Possible Causes –
An electromagnetic relay, electromagnetic
solenoid, electromagnetic counter with
inductive component as circuit load.
DIODE SUPPRESSION
DIODE
INDUCTIVE
LOAD
VARISTER PROTECTION
INDUCTIVE
LOAD
VARISTER
INDUCTIVE
LOAD
RC SUPPRESSION
2
SWITCH
[uf]
C
10
R
(1+50/E)
10*I
R
PIV DIODE > V
REED
SWITCH
REED
SWITCH
USED IN
AC CIRCUITS
REED
SWITCH
SWITCH
C
CAPACITIVE LOADS
Possible Causes –
A capacitor connected in series or parallel with
Reed Switch control. In a closed circuit, a cable
length (usually greater than 50m [162.5 ft.])
used to connect reed switch may also introduce
static capacitance.
SURGE LIMITER FOR
CAPACITANCE IN SERIES
+V
L =0.5~5 mH
P
R
A
L
P
C
REED
LOAD
SWITCH
REED
SWITCH
RESISTOR PROTECTION
FOR CAPACITIVE LOAD
+V
R = 50~500 Ohms
R
A
R
B
C
LOAD
R
INDUCTIVE PROTECTION FOR
CABLE LENGTH CAPACITANCE
L
P
L = 0.5~5 mH
P
LOAD
SWITCH
Cable Length
over 50 meters
[162.5 ft.]
REED
LAMP LOADS
Possible Causes –
A tungsten lament lamp load.
CURRENT LIMITING RESISTOR
IN SERIES
+V R
L
V-0.12 R
R
2
SWITCH
Do not subject reed switch control to excessive shock and vibration, including:
• Bending or placing force loads on reed switch housing
• Over-torquing ttings on reed switch housing
• Placing pull-out force on load wires
CURRENT LIMITING RESISTOR
IN PARALLEL
R
L
SWITCH
REED
SWITCH
+V R
5R > R
L
L
R
REED
SWITCH
W.E. ANDERSON
A DIVISION OF
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
Printed in U.S.A. 10/19 FR# 440783-00 Rev. 11©Copyright 2019 Dwyer Instruments, Inc.
Phone: 219/879-8000
Fax: 219/872-9057
www.dwyer-inst.com
e-mail: info@dwyermail.com
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