Sensors & transducers
The special challenge here is the absence of chlorine over a longer period of time after filtration. With many amperometric sensors, this absence leads to a delayed response behavior, with the sensor essentially falling asleep. This can lead to product loss since the beverage syrup is added while undetected chlorine is present in the raw water after filtration. The Memosens CCS51E sensor from Endress+Hauser for measuring free chlorine exhibits no delayed response even after a longer period of inactivity, thus ensuring that any chlorine peaks do not go undetected. The sensor furthermore “notices” chlorinated water once a week when the filtration is bypassed. This tests the functionality of the sensor and ensures electrochemical activation. Compared to wet chemical analyzers that use the DPD method, which can provide a measurement value only every three minutes, inline measurements with amperometric sensors offer continuous measurements in which no peaks are overlooked.
Continuous measurements are furthermore beneficial for controlling the chlorine dosage. The fast measurement value means a more precise dosage: as little as possible, but enough for a reliable disinfection
process. Achieving this degree of precision requires creating an adequate flow to the sensor membrane of 15 cm/s. If the sensor is calibrated once a year, the DPD calibration should be carried out by drawing the sample near the sensor, keeping the cuvette clean, observing the expiration date of the DPD reagents and avoiding air bubbles in the sample.
The amperometric sensors require no reagents, making them low maintenance. The new generation of Memosens sensors also stores more data regarding calibration and operating hours – such as the electrolyte counter – and the load, making it possible to develop a more efficient maintenance strategy tailored to the application. Last but not least, the new generation of sensors is more efficient when it comes to commissioning. Once installed, only a short polarisation cycle is required before they begin to display stable measurement values, thus ensuring that the plant is fully functional again within a short period of time. With some beverage manufacturers, raw water treatment has developed to the point that they have to monitor not only the free chlorine levels but all disinfectant residues. Total chlorine sensors such as the Memosens CCS53E are suitable for these types of measurements. This sensor reliably and quickly monitors free (HC1, OC1) and combined (chloramines) chlorine, thus leading to an even safer product.
SUMMARY
By relying on suitable measurement and dosage technologies that feature fast response behavior, beverage manufacturers can precisely treat their raw water to ensure consistent beverage quality. Reliable and continuous transmission of the measurement data ensures precise dosing of the disinfectant, resulting in increased process efficiency. The Memosens CCS51E and CCS53E sensors from Endress+Hauser meet all of these requirements and also offer connectivity to extended IIoT services through Memosens 2.0 technology for future- proof operation of the plant.
Endress + Hauser 70
www.uk.endress.com May 2024 Instrumentation Monthly
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