To deliver accurate level detection, a transmitter is placed at the bottom of the tank holding the liquid then converts the pressure reading to an analog 4-20 mA output signal. A breathing tube is used as a reference port to determine the atmospheric pressure outside of the tank.
Turck introduces PT4500 and PT4510 submersible pressure transmitters, optimized for detecting the level of water or other media with similar density in challenging industrial environments, including in wastewater and irrigation systems, as well as tanks containing liquids such as gas and diesel. The PT4510 is designed for low-level applications of up to 400 inches, while the PT4500 is available in ranges up to 100 psig. These IP 68 rated, stainless steel pressure transmitters may be used in industrial applications, as well as hazardous classified areas. The transmitters carry UL/cUL 913 approval for use in Class I, Division 1, Groups C and D locations when installed with an approved barrier, such as Turck's IM33 series. http://www.turck-usa.com/
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