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I've been using these pneumatic switches for the bilge pumps for 34years eliminates the problems of debris fouling the float switches. Their new type only shows 12v called the mfg and got voice mail with no call backs does anybody have an alternate for these?
Those switches have always interested me. if you cannot get a 24 or 32 volt unit, maybe you can use the 12 volt unit to actuate a relay. the actuation side of the relay will draw very little so it probably wouldn't burn out the contacts (need to do the math, 32v x 1 amp to actuate the relay would give you 32 watts going through the float switch). the power to the pump would be provided through the main side of the relay. or buy Ultra safety systems float switches, they are bulletproof