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Photoelectric Sensors Optical light is used to detect the presence of liquid, thus various and non-conductive liquids can be detected easily and reliably. With integrated electronics, commissioning is simple and it is unnecessary to adjust sensors The operating principles is based on the total reflection of the infrared light on the inside of a translucent cone with a 45° tip. The critical angle for total reflection of the infrared light changes depending on whether the sensor tip is surrounded by liquid or air. In air the beam will be reflected twice and returns to the receiver, in liquid the ray will be deflected into the liquid. The liquid can be electrically conducting, non-conducting, a cloudy liquid or clear making the sensor very versatile. The head is made of borosilicate glass and the different housings available, including high-quality steel field mountable versions offer extreme resistance to a great number of aggressive substances. Liquid Analysis Baumer has a series of precise and repeatable conductivity measurement devices with temperature compensation over a wide range from a few Mycro-Siemens upto one thousand Milli-Siemens. Two isolated analogue outputs are provided for conductivity and temperature. A binary interface enables the automatic selection of four preset measurement ranges. This ensures exact repetition in a given recipe. Leak Detecting Sensors With optical leak detecting sensors, liquids from typically 1 ml can be easily and reliably detected. Typically, 1 ml of leaked liquid is sufficient to initiate an alarm. This and a fast response time of less then 1 ms allows an early leak detection and can lead to an emergency shut-down. It is therefore possible to prevent contamination of the system and loss of production facilities. The leak detecting sensor is coated with Teflon® PFA for protection in aggressive environments, is durable in use and requires no adjustment. The sensor can be screwed directly on the floor or on a base and is very quick and easy to release from its intelligent clip-system. That saves time and money during installation, commissioning and cleaning the system. Accessories: Standard and Hygienic Process Connections Aggressive, hot, high-viscosity, polluted, delicate or pure media / measured substances require an increased effort if measuring equipment is to be professionally integrated into the process. Welding sleeves from austenitic stainless steels, special materials, or coatings allows the use of Baumer level measuring devices in most applications.

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