Water / Wastewater 29
Figure 3: TU5400 with SC1000 installation in a German drinking water plant
Figure 4: TU5200 installation in a French drinking water plant Field Test 5400 TURBIDITY FNU 1720 TURBIDITY
Multiple TU5400 and TU5300 process turbidimeters and TU5200 laboratory turbidimeters were installed and tested at five drinking water plants in France, Germany, and the UK. Each plant used the new instruments to monitor turbidity in post-filtration finished drinking water. Online measurements were taken simultaneously with the TU5400 or TU5300 and the analyzer presently in use at each site. Grab samples were measured with the TU5200. Calibrations were conducted with 20 and 600 NTU standards. Cells were cleaned manually with a special cleaning brush.
Testing was conducted to evaluate the ability of the new instruments to address several of the known areas for improvement attendant with turbidity measurement. Specifically, the tests were designed to assess matching between process and laboratory measurements, speed of response, and maintenance time. The process and laboratory instruments also utilize an RFID sample identification system. This system and the associated data comparison software were also appraised.
Figure 3 shows a typical TU5400 installation. The TU5400 analyzer was installed in line with an existing Hach ULTRATURB plus sc. Flow to the TU5400 was controlled with the instrument flow regulator, and monitored with an integrated flow sensor. The instrument was screw mounted to the instrument panel. Similar installations were made in each plant. The TU5400 was controlled with either an SC200 or SC1000 controller. The TU5200 was operated on the laboratory bench. Figure 4 shows the representative footprint of the benchtop instrument.
Date Figure 5: TU5400-1720E data trend in a British drinking water plant
A comparison of process instruments illustrates excellent agreement between the existing turbidimeter and the TU5400. Figure 5 shows a monthly data trend for the TU5400 and a Hach 1720E turbidimeter. Turbidity events tracked exactly between the process instruments. Differences between process turbidity values were within the accuracy specifications of both instruments.
A comparison of TU5400 process data to TU5200 grab sample data also demonstrated excellent matching. Figure 6 shows periodic grab sample data against the process data trend. The values matched at the baseline and during turbidity events.
TU5200, FNU TU5400, FNU
The comparison of process to lab data was facilitated by the sample RFID system. A sample RFID tag was scanned at both instruments—at the TU54000 where the sample was obtained, and then at the TU5200 benchtop unit. The process value was automatically uploaded to the laboratory instrument, and after the lab measurement, the values were compared within the TU5200 software. Data logs were generated with each measurement, enabling easy quality control monitoring. The data comparison tool indicated whether values matched, and suggested cleaning when the cell was dirty. Cleaning was accomplished with a simple brush.
Conclusions Date Figure 6: TU5400-TU5200 process vs laboratory data trend in a French drinking water plant
Author Details Vadim Malkov, Product Applications Manager • HACH Lange GmbH
Contact Details Aimee St Peter •
astpete@hach.com • Global Marketing Communications Manager • HACH Lange GmbH
www.envirotech-online.com IET Annual Buyers’ Guide 2016/17
The TU5000 series turbidimeters demonstrated significant advancements in turbidity measurement. The 360° x 90° measurement system generates an extremely high S/N ratio, improving precision and accuracy. Data matching between process and lab instruments is also greatly improved, and tracking and comparison of these data are automated with the RFID option. The process analyzers demonstrated significantly faster response to turbidity events. With the novel 360° measurement system,10 mL cell, and RFID technology, the Hach TU5000 turbidimeters provide the most sensitive, fastest, and best matching turbidity measurements available.
FNU
FNU
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