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Automation Technologies 3/2014

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Automation Technologies 3/2014

Sensors and Measurement

Sensors and Measurement put them out as standard signals at 4.20 mA and 0…10 VDC. The 100 % end control by a fully automatic measuring and calibration system and the resilience of the chosen materials warrant the high plant availability required for reverse osmosis. Details of maintenance-free inductive sensor 02 Inductive conductivity sensor and measuring transducer/controller are designed robustly in IP67 and thus resist aggressive environmental influences while particles, microorganisms and various other pollutants are discharged in a partial flow. The sea water used for reverse osmosis contains salts at a concentration of up to 35 g/l. Using conventional pressure converters may therefore lead to measuring mistakes or sensor failure due to deposits and corrosion if the salt contents are that high. The pressure transducer Jumo Midas C18 SW is very well suitable for such applications because of its housing and pressure connection of corrosion-resistant titanium and the chemically insensitive measuring cell without oil filling. The core piece is a hysteresis-free, piezo-resistive pressure sensor on a ceramics basis in thick-film technology. In addition to high long-term stability, it has a triple overload resistance referring to the measuring end value. The pressure transducer can record relative pressures in the range of 1.6 to 100 bar and The inductive conductivity sensor Jumo Ecoline Ci is also designed for conductivity measurements. In contrast to the conductive 2- or 4-pole measuring method, the sensor with its inductive measuring procedure is almost maintenance-free. Deposits, fat or oil films on the sensor surface do not influence measuring accuracy. The installed Pt1000 temperature sensor records the process temperature at the same time, permitting precise temperature compensation that is particularly important when measuring conductivity. It can be chosen freely standing in a stainless steel sleeve or About Company name: Jumo Headquarters: Fulda, Germany Employees: more than 2100 Established: 1948 Turnover: € 218 m Products: the entire measuring chain from sensors all the way to automated solutions 100 AUTOMATION AUTOMATION TECHNOLOGIES TECHNOLOGIES 3/2014 4/2014

Sensors and Measurement back to current issue previous page completely embedded in a plastic body. The internal installation is recommended for measuring media — including sea water — that may attack the stainless steel sleeve chemically. The sensor‘s body material is made of polypropylene by default and thus suitable for use in sea water. The materials contacted by the measuring medium are approved for food contact, physiologically harmless and listed by the FDA. Intuitive application of the measuring transducer The measuring transducer/controller type Jumo Aquis 500 Ci is coordinated with inductive conductivity sensors such as the Ecoline Ci. The user-friendly operation takes place either via film keyboard and plain text graphics display or via a PC setup program. Displaying the parameters in plain text simplifies configuration, supports correct programing and intuitive use of the device. The lit LC graphical display also makes the device suitable for use on site. A robust housing protects the electronics and electrical connections from aggressive environmental influences (IP 67). Alternatively, the unit may also be installed in a control panel. The modular build enables adjustment of the measuring transducer to the individual requirements. There are up to two analogue outputs available. Measuring range start and end value can be set freely for the analogue actual value outputs. The conduct of the outputs for exceeding or undercutting the measuring range, alarm and calibration can be configured freely. As control functions, P-, PI-, PD- and PID-structures can be programmed freely. 03 Conductivity monitoring and control is achieved via Jumo CTI-500 inductive conductivity transmitter; the integrated temperature measurement allows precise and fast temperature compensation, which is high priority here All of these devices help maximize the quality of the end product from sea water desalination — i.e. producing the purest potable water. The Jumo technology thus makes a valuable contribution to solving the great task of supplying the global population with the staple food of water. Photographs: Lead & background fotolia www.jumo.net AUTOMATION AUTOMATION TECHNOLOGIES TECHNOLOGIES 4/2014 3/2014 101

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