Electrical - ProMinent DULCOMETER PH-501 Assembly And Operating Instructions Manual

ELECTRICAL

Step Six
Supply Voltage: The supply voltage to the Switch Tek™ level switch should never exceed a maximum of 36
VDC. Flowline controllers have a built in 13.5 VDC power supply which provides power to all of Flowline's
electrically powered sensors. Alternative controllers and power supplies, with a minimum output of 12 VDC
up to a maximum output of 36 VDC (30 VDC with LZ12 series), may also be used with the Switch Tek™ level
switch.
Required Cable Length: Determine the length of cable required between the Switch Tek™ level 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 feet, using a well insulated, 14 to 20
gauge shielded 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 Outputs (Current sensing): The standard
method used by Flowline controllers; this technology
uses only two wires (Red and Black). The sensor
draws 5 mA when it is dry, and 22 mA when wet.
NC/NO status must be set by the controller. The
White and Green wires are not used.
Signal Output (Relay switching): Allows the sensor to switch a small load on or off directly, using an internal
1A relay (60 VAC/60 VDC). Only model LU10 ___5 uses the relay and features 4 wires (red, black, white and
green) and a shield wire. 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:
Normally Closed Wiring:
E-1268
12 of 20 LO900002 Rev A