LST300 | COMPACT ULTRASONIC LEVEL TRANSMITTER | LST300–EN REV. E
19
Wiring
Wire the transmitter as follows:
1 Remove the cap from one of the two electrical connection
ports located at both sides in the upper part of the
transmitter housing.
2 If needed, fit various adaptors and bushings to the ½ inch
internal NPT threads of the connection ports to comply with
plant wiring (conduit) standards.
3 Remove the housing cover of field terminals, side. However,
in an explosion-proof installation, do not remove the
transmitter covers when power is applied to the unit.
4 Run wiring through the open port. Connect the positive lead
to the + terminal and the negative lead to the – terminal.
IMPORTANT (NOTE)
Do not connect the power across the test terminals, which
could damage the test diode in the test connection.
5 Plug and seal the electrical ports. Make sure that when the
installation is completed, these openings are properly sealed
against entry of rain and corrosive vapors and gases.
6 If applicable, install wiring with a drip loop. Arrange the drip
loop so that the bottom is lower than the conduit connection
and the transmitter housing.
7 Put back the housing cover, turn it to seat O-ring into the
housing, and then continue to manually tighten the cover
until it contacts the housing metal-to-metal.
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