1.3
Mounting
The Multi-Point Vertically Mounted Liquid Level Float Switch is
available with a variety of threaded or flanged mountings. These
devices can be installed from the bottom or top of the tank. The
switches should be mounted in an area clear of turbulence or
direct streams. Contact factory for flanged mount options.
1.3.1 Threaded Mounting
Apply either Teflon
®
tape or appropriate thread sealant to mount-
ing threads to prevent galling. Engage thread by hand to avoid
damage. Using a wrench, rotate the unit clockwise until threads are
tight in mounting.
1.4
Wiring
1. SPST reed switch: Connect wiring to switch leads or terminals per
wiring diagram. See figure 1 or 2.
2. SPDT reed switch: Connect wiring to proper switch leads or termi-
nals per wiring diagram. See figure 3 or 4.
NOTE: Observe all applicable electrical codes and proper wiring
procedures.
Contact Protection:
In order to take advantage of the long life, highly reliable charac-
teristics of a reed switch, it is essential to provide protection when
switching inductive loads. When current is interrupted, the induc-
tance of the load generates a high frequency voltage, which
appears across the switch contacts. If the voltage is large enough, it
can cause arcing. Arcing can cause the contacts to weld to each
other resulting in unreliable switching performance. It is essential
to protect the circuit by suppressing the voltage to prevent arcing.
This can be easily acheived through the use of a diode for DC cir-
cuits (Fig.5) and a resistor-capacitor network for AC circuits (Fig.6).
Multi-Point Vertically Mounted Liquid Level Float Switch
2
Fig. 5
Fig. 6
Fig. 2
Group 2 SPST
Independant Circuits
Fig. 1
Group 1 SPST
One Common Wire
Fig. 3
Group 3 SPDT
One Common Wire
Fig. 4
Group 4 SPDT
Independant Circuits
Summary of Contents for L500
Page 14: ...Notes ...
