Level switches, based on the conductivity principle, can be applied to liquids with conductivity higher than 10 μS/cm. For detecting the level, probes are immersed into the tank. These probes (and the tank wall if conductive) serve as contacts of an electric circuit. Probes can be of single or multiple rod versions. A maximum of 4 proberods can fit in the multiple probe with an additional reference probe if tank wall is not conductive. The probe length should be in accordance with the level to be detected. Filling liquid in the tank will change the electrical conductivity between tank wall (or the reference probe) and probes. The established connection will be converted and will activate a relay providing for output.

∎ Applications

• Supply voltage: 24…240 V AC/DC
• Ambient temperature: −20…+50 °C
• Process temperature: up to +200 °C
• Process pressure: up to 16 bar
• Output: 250 V AC, 16 A or 8 A
• Process connection: ⅜", 1½"
• Ingress protection: IP65 / IP67, IP20