Monitoring & metering
even the most challenging wastewater streams. The system supports ISO 6878 or APHA 4500-P/C colorimetric methods, with model options offering ranges of either 0.01 – 10.0 mg/l, or 0.1 – 50 mg/l. The cabinet houses all of the key components of the measurement system, including reagents, pumps, compressor, photometer and transmitter/display unit. The filtration head removes suspended solids from the sample, but a number of highly innovative features ensure sampling does not affect measurement uncertainty. For example, a built-in compressor automatically implements air-pulse cleaning to extend service intervals. Typically, the filters are replaced every three to four weeks – a process that takes just a few minutes, and requires no special tools. Used filters can then be chemically cleaned, using a special cleaning apparatus that is supplied as standard. This means that filters can be expected to last for over two years.
The stability, repeatability and accuracy of measurements are enhanced by an overflow cell that eliminates pressure and flow fluctuations, and an auto-zero check is conducted before every measurement. In addition, the instrument conducts automatic self-diagnosis of sample flow and reagent levels.
Orthophosphate measurement is ideal for process control, but many plants also employ this technology for monitoring final effluent, correlating with laboratory results for Total Phosphorus (TP). This is because online TP takes longer due to the requirement for a digestion stage. Online TP instruments are also more expensive.
OPTIONAL EXTRAS… FOR EVEN GREATER PEACE OF MIND
An optional cleaning module is available to help keep the photometer and overflow cell free from biofilm, and heated sample lines can be added for particularly cold locations. In addition, many customers also purchase Swan’s solid-state photometer verification kit.
SUMMARY
Swan Analytical’s wastewater phosphate measurement solutions reflect the company’s key brand values. The AMI Phosphate instruments are designed to offer highly accurate, stable and repeatable measurements with a low maintenance requirement and a low lifetime cost, but as John Saxton emphasises: “This can only be achieved with the reliable sample quality that is provided by the new Sample Filtration Cabinet. With this technology, wastewater process managers can minimise precipitation costs, optimise performance and maintain regulatory compliance.”
SWAN Analytical UK
uk.swan.ch
Instrumentation Monthly August 2026 55
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