The AU-22 top-mounted level switch controls liquid levels in pressurised or unpressurised tanks. A stainless-steel float with a permanent magnet operates reed switches inside the guide tube. The resulting signals can provide low/high alarms and pump start/stop control.

Minimum density: 0.6 g/cm³. Maximum temperature: 150 °C. Manufactured lengths up to 6 m. Body: AISI 304, optionally AISI 316 with additional PTFE coating. Float: AISI 316, optionally PTFE coated. Maximum switching voltage: 400 VAC/DC. Maximum pressure: 16 bar. Connections: flanged, BSP or NPT; minimum DN50 PN16 flange or 2-inch thread. Contacts: NO/NC; up to six NO or two NC contacts. Dual control panel available.

Applications include shipbuilding, clean-water and wastewater tanks, food processing, acid tanks and chemical/petrochemical tanks.