Aarhus/Staffanstorp/Swindon, July 31, 2007 - Thanks to their chemically resistant parylene coating, Baumer’s UNAR ultrasonic sensors are ideally suitable for level monitoring in environments of aggressive substances, therefore improving the process security considerably. Ultrasonic sensors have the unique ability to detect media and objects securely and reliably, regardless of their surface characteristics and color. Due to this, ultrasonic sensors are being employed for level monitoring of granulates, pastes or liquids increasingly. However, many of these media involve liquids or generate vapors that can have a damaging effect on material in the long term and consequently risk the functional reliability of standard sensors.
Therefore, special attention has been paid to these application aspects when designing the new UNAR family of ultrasonic sensors. The M18x1 sensor housing is made of 1.4435 stainless steel, while the front of the transducer is protected by a chemically resistant parylene coating. This coating creates an excellent barrier effect against inorganic acids, alkalis and organic solvents as well as water vapor, which results in a substantial improvement of process security. All sensors in the UNAR line feature the proved Teach-in function with which a scanning range up to a maximum of 1000 mm Sde can be programmed.
This operation can be started either directly on the sensor via a push button or externally using a Teach-in input. Accessories include a 4-character, 7-segment display in the chromium-steel housing with a 4 to 20 mA input which can be directly activated by the output signal from a current analog sensor
