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FT900003
Rev A1
WIRING
Step Five
Supply Voltage:
The supply voltage to the Thermo‐Flo™ flow switch should never exceed a minimum output
of 14 VDC or maximum output of 36 VDC.
Required Cable Length:
Determine the length of the cable required between the Thermo‐Flo™ flow switch
and its point of termination. Allow enough slack to ensure the easy installation, removal and/or maintenance
of the sensor. The cable length may be extended up to a maximum of 1000 ft, using a well‐insulated, 14 to 20
gauge shield four conductor cable.
Wire Stripping:
Using a 10 gauge wire stripper, carefully remove the outer layer of insulation from the last 1‐
1/4” of the sensor’s cable. Unwrap and discard the exposed foil shield from around the signal wires, leaving
the drain wire attached if desired. With a 20 gauge wire stripper, remove the last 1/4” of the colored
insulation from the signal wires.
Signal Output (Relay Switching):
Allows the sensor to switch a small load on or off
directly, using an internal relay rated below 60 VA.
The NO/NC status is set by the polarity of the voltage
feeding the red and black wires. The green wire is the
common for the relay and the white wire is the NO or
NC, depending on the polarity of red and black.
Normally Open Wiring:
Wiring to a Flowline Controller:
LC80 Series Controller
LC30 Series Controller
