INSTRUMENTATION • ELECTRONICS
still undesirable substances or cleaning agents in the water that require additional rinsing.
NO MORE CONTAMINANTS To monitor the final rinse with WFI, the SE 605 H Memosens 2-electrode conductivity sensor is used. Tis sensor was developed by Knick for measuring ultrapure water in the range of 0.001 to 600 µS/cm. Te SE 605 H has a hygienic design with two coaxially arranged electrodes of electro-polished stainless steel 1.4435 that shows a surface roughness of < 0.4 µm or < 0.8 µm. Te insulator consists of PEEK, all used materials are FDA compliant. Te wet and hot environmental conditions in the plant are no problem for sensors with Memosens technology. A particular feature of this digital sensor technology is that the processing of the measured values based on inductive, contactless data transmission and energy supply takes place in the sensor head. Tis way, sensor-relevant data can also be directly saved and analysed in the sensor enabling the pre-calibration of the sensors in the laboratory. Tanks to a bayonet coupling, the sensor can be easily connected and disconnected without any cable twisting. Furthermore, it allows inductive transmission of the digitised measured values between sensor and process device. Te contactless coupling of the plug connection can neither be affected by moisture, corrosion nor by deposits and it ensures a perfect galvanic separation as well as a trouble-free data transmission.
As soon as the SE 605 H measures
the required value of < 2.7 µS/cm using the WFI in the last rinsing process, the cleaning process is completed and the SIP process can be started. Here, ultrapure steam, which is heated to 126°C, is led through the system for 15 minutes to reliably sterilise all process-wetted parts of the plant.
SIGNAL TRANSMISSION IN A COMPACT DESIGN Te measured values from the sensors are transmitted to the control system via slim MemoRail A1401N analysers in just 12.5mm wide DIN rail housings. Tese analysers transform the sensor and temperature values into 4 to 20 mA signals and directly transmit them to the control system via two standard-signal current outputs. DIP switches on the
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ABOVE: Diagram of a new CIP/SIP plant with the conductivity sensors from Knick BELOW: One of the mobile sterile filtrate tanks that Ever Pharma Jena uses
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