Burkert, of Irvine, Calif., introduces the Type 8181 Buoyancy Level Switch built to detect liquid levels and switch pumps, valves, PLC relays and alarms. Applications include level control, minimum and maximum level monitoring, leak detection, pump protection, and overfill protection. It’s designed for on/off control with the unit’s stem incorporating a reed contact, float and magnet. Depending on the liquid level, the float actuates the reed contact.