APG KA Cable Suspended user manual - Manual (Page 6)

KA Series Rev. A2, 12/08
6
Automation Products Group, Inc.
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• Options
Higher working temperature to 80°C (175°F): Model -K
Longer cables to specifi ed lengths
Smaller switching diff erentials down to 1.25 in.
Greater switching diff erentials to 75 in. (Standard series) or 60 in. (M series)
Alternative logic at switching points (normally open vs. normally closed)
Alternative cables in rubber and urethane
Alternative cables in tefl on, (max. 4 conductors = 3 or less switch points)
Lead weight in place of polypropylene-covered weight
• Chemical Compatibility — Corrosion Resistance of Materials
With a standard KA fl oat switch, the only materials in contact with the liquid
are the polypropylene covered fl oat and weight, the heavy duty PVC coated
cable, and the polypropylene wedge. Consequently, these switches are
unaff ected by a wide range of liquids. However, there are some liquids that
are not compatible with these materials. For such applications, alternative
construction materials are available as indicated in the Options section
above. In assessing corrosion, key factors are the liquid temperature and
concentration, and the amount of time the fl oat is immersed. Even if periodic
replacement of KA fl oat switches is necessary, they still may be the most
economical choice. Rubber cables are preferred for applications where
freezing conditions can occur, because the PVC coated cable tends to stiff en
in such situations.