To continually monitor the level of liquids in slurries or vessels, use this level transmitter from Siemens. It's designed for short-range ultrasonic level measurement and needs no direct contact with liquid, so can be installed outside of a tank. As its sensor is fully encapsulated, the device resists corrosion, shock and chemicals, which means it's compatible with demanding environments. Installation is simple, as the unit has only two wires to connect. For accurate readings in all conditions, it uses Sonic Intelligence echo processing algorithms that tell the difference between true and false media levels. This device is suitable for use in wastewater monitoring.

• Simple to configure and use, thanks to its two-button user interface
• Suitable for both open and closed vessels for versatility
• Optional tri-clamp mounting for easy removal of the unit
• IP68-rated housing is protected against submersion in up to 1.5m of water for 30 minutes, as well as dust

No, this device comes with built-in temperature compensation, so it remains accurate in temperatures ranging between -30°C and +60°C.