Series FTS Flow Thermal Switch is especially designed, for all types of cooling
systems, as a reliable alternative to failure prone mechanical flow switches. The
Flow Thermal Switch continually samples the temperature of the coolant and
adjusts the low flow setpoint automatically, providing a solid state switch should
the coolant flow rate fall below the setpoint value. In addition, the Flow Thermal
Switch will provide an alarm output should the coolant temperature rise above
acceptable levels. You have double protection with the FTS.
Wiring Diagram
MAINTENANCE
Upon final installation of the Series FTS Flow Switch, no routine maintenance is
required. A periodic check of the system calibration is recommended. The Series
FTS Flow Switch is not field serviceable and should be returned if repair is
needed (field repair should not be attempted and may void warranty). Be sure to
include a brief description of the problem plus any relevant application notes.
Contact customer service to receive a return good authorization number before
shipping.
W.E. ANDERSON DIV., DWYER INSTRUMENTS, INC.
P.O. BOX 358 • MICHIGAN CITY, INDIANA 46360 U.S.A.
Phone: 219/879-8000 www.dwyer-inst.com
Fax: 219/872-9057 e-mail: info@dwyermail.com
Series FTS Thermal Flow and Temperature Switch
Specifications - Installation and Operating Instructions
Bulletin F-41-FTS
¤
A-284
1/2” NPT
1
-1/16 HEX
(26.9)
4
3/64
(17)
2
(50.8)
2-7/8
(73)
3-43/64
(93.3)
1/2” NPT
1-1/16 HEX
(26.9)
43/64
(
17)
1/2
(12.7)
1-3/8
(34.9)
2-13/64
(55.9)
Load
1 - brown
4 - black
3 - blue
V DC
2
©Copyright 2014 Dwyer Instruments, Inc. Printed in U.S.A. 9/14 FR# R5-443468-00 Rev. 1
SPECIFICATIONS
Service: Water based liquids.
Low Flow Set Point: .4 m/s (1.2 fps) (water related) typical.
Temperature Set Point: 122°F (50°C) or 158°F (70°C), other settings possible on
OEM demand.
Temperature Limits: -4 to 176°F (-20 to 80°C).
Response Time: 5 to 10 seconds.
Repeatability: 0.5%.
Hysteresis: <20% of set-point value.
Pressure Limit: 150 psi (10 bar).
Protection Class: NEMA 6 (IP 67).
Wetted Material: 303 SS.
Process Connection: 1/2˝ Male NPT.
Electrical Connection: M12 male socket 4 pin with 6 ft (2 m) connection cable
with M12 connector sold separately.
Power Requirement: 18-30 VDC.
Electrical Rating: <200 mA.
Power Consumption: 4 W max.
Initial Operation: After 15 seconds.
Switch Type: PNP N.O. (switch closes with flow).
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