The PS45 is a point level (on - off) pneumatic switch device used in conjunction with the KM26 Magnetic liquid level indicator, LS Series Cage Level switch or an External Chamber. The unique magnetic coupling action eliminates the need for such things as seals, diaphragms, springs or torque tubes. Since process connections to the switch are eliminated, the user is insured complete isolation from the process. Valves are not required to block off the switch from the process for maintenance or operational testing. Preventive maintenance functions are greatly reduced since the switch never contacts the process fluid.