The AU-21 rod-operated level switch uses a magnetic stainless-steel float and reed switches for on/off liquid-level control in pressurised and unpressurised vessels. Contact positions and normally open or normally closed operation can be specified; the minimum spacing between contacts is 30 mm.

Body and float: AISI 304 stainless steel, optionally AISI 316 with PTFE coating. Operating temperature: −10 to +125 °C. Maximum pressure: 16 bar. Maximum switching voltage: 400 VAC/DC. Switching capacity: 60 VA. BSP or NPT connection, minimum 3/8 inch. IP68 and explosion-protected options are listed; confirm the exact selected version and approval. Applications include marine tanks, bilges, water, fuel, food and chemical processes.