APG KA Cable Suspended user manual - Manual (Page 14)

KA Series Rev. A2, 12/08
14
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As a working
example, consider
a type 4H needing
a pump operating
diff erential of 20
inches (= dimension
B). From the graph it
can be seen that the
corresponding value
for A is approximately
19 inches. Now
suppose that the
fl oat is to operate
in a tank so that the
pump “off ” position (level L) is 15 inches from the bottom of the tank. This
means that the fl oat must be hung so that the zero reference height (free-
hanging face of the fl oat) is 6 inches from the bottom of the tank. The high
and low alarm points HH and LL will then be, respectively, close to 41 and 11
inches from the bottom of the tank.
For type 2HL, the diff erence between the high and low alarm points is the
diff erence between levels LL and HH in the graph. Note that this corresponds
to distance B + C + 4 inches and the distance A for weight positioning must be
• Termination and Height Fixing
There are several methods that can be used to fasten the cable so that the
fl oat is positioned at the right level in the tank. The three most commonly
used are illustrated below. Very frequently, the cable will need to be led into
a standard NEMA box with terminals for extension to the control panel. The
liquid tight (70PSI) Strain Relief Connector (Part# SRCG) can be used to lead
the cable through the wall of the box.