The PFA series is manufactured by Celduc, and is a broken finger float level switch. It consists of 1 normal open contact fluid level is up and 1 normal closed contact fluid level is down. There is also a float under the sensor with 1 normal closed contact fluid level is up and 1 normal open contact fluid level is down. It has maximum current rating of 0.4 A, and has an IP67 class of protection.