Endress+Hauser”s Waterpilot FMX21 level sensor has a stainless steel housing and an easy-to-clean, flush-mounted process diaphragm, making it a good fit for measuring the level of sludge and wastewater. With an optional Pt 100 sensor, it can also measure temperature. A corrosion-resistant, coated version is available for use in particularly aggressive environments, such as salt water. The sensor uses a ceramic cell to measure pressure. Any changes in pressure cause a change in capacitance, which the sensor’s electronics convert into a 4-20mA signal that is linear to the level of the liquid. HART 6.0 is super-imposed on the 4-20mA signal, allowing an operator to adjust the range remotely. For water and wastewater applications, the sensor has KTW, NSW and ACS drinking water approvals. By using the Field Xpert PDA, operators can communicate to the FMX21 wirelessly to set all parameters and diagnose problems.