Series FTS Thermal Flow and Temperature Switch

For Industrial Cooling Systems

This series is no longer available, see Series TDFS2 for the suggested replacement.


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.
<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).


  • Compact electronic unit with no moving parts
  • No adjustment or calibration needed
  • Maintenance free
  • Fail safe normally open switch
  • Easy to install


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