The 1-in. 25000 Series captive linear actuators use Hall-effect sensors in an IC package mounted directly on the actuator. The sensor has a virtually unlimited on-off cycle life due to the noncontact operation of the switch.
The repeatable on/off signal uses a rare-earth magnet embedded on the end of the internal screw. As the screw moves in and out of the actuator, the magnet moves toward and away from the sensor face, causing the device to switch states. The sensor operates in a digital switch mode using an open-collector output through a npn transistor switch. The three-wire switch requires at least 3.8 Vdc with a current consumption of 10-mA maximum. Maximum voltage is 24 Vdc.
Haydon Kerk Motion Solutions Inc., 1500 Meriden Rd., Waterbury, CT 06705, (203) 756-7441, www.haydonkerk.com