Get the 411 on Endress+Hauser's Orthophosphate Analyzer

Phosphate analyzer from Endress+Hauser is designed to provide accurate measurements from process streams while conserving reagent.
Get the 411 on Endress+Hauser's Orthophosphate Analyzer
The system is designed to operate for as long as six months without a reagent change.

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Many analytical instruments rely on reagents, which become a major component of the instruments’ lifetime operating costs.

For manufacturers developing new instruments, an important goal therefore is to conserve reagents with devices that consume smaller amounts per sample and extend reagent shelf life. Endress+Hauser has developed a colorimetric orthophosphate measurement device designed with both those concerns in mind.

The Liquiline System CA80PH orthophosphate analyzer combines a precise sample pumping mechanism with an onboard cooling system. The manufacturer says the device can triple the time between reagent change-outs. It also includes automatic calibration and cleaning, and advanced diagnostics. Steven Smith, product marketing manager, talked about the device in an interview with Treatment Plant Operator.
TPO: What need in the marketplace drove development of this instrument?

Smith: Our new line of colorimetric analyzers is designed to help customers reduce their cost of ownership. The cost to operate a colorimetric analyzer rises and falls with reagent consumption. We have introduced a delivery system for reagents, cleaners and standards that uses a very small amount of reagent for each reaction. Even with continuous operation, that dramatically reduces overall reagent consumption.

TPO: At what points in the wastewater treatment process would this phosphate analyzer be found?

Smith: It would be deployed primarily in three areas. First, at the head end where operators are interested in the incoming phosphate levels and might attempt some degree of removal. Second, after the activated sludge process and before secondary clarification, where they are looking to precipitate phosphate out of the process. And third, before discharge, to verify that the effluent is meeting permit requirements.
How does this device interact with the treatment process?

Smith: It is a cabinet analyzer, about the size of a college dormitory refrigerator. Like all colorimetric devices, it has two parts: a sample preparation system, and the analyzer itself. The sample preparation system draws liquid out of the process, filters it and delivers a fresh sample to the analyzer. This device has a 0.1-micron filter system that basically removes all solids from the process water and delivers a very clean liquid. That liquid runs into a weir, or sample cup, that is constantly being refreshed. The analyzer pulls a sample off of that weir at whatever interval the customer programs. Through the controller, the user can define how often the analyzer runs the analysis.

TPO: How does this unit achieve high efficiency in use of reagents?

Smith: The system is designed to operate for three to six months without a reagent change. We have essentially tripled the life of the reagent. We’ve added a cooling system that cools the primary reagent and allows it to stay in the analyzer longer. For the dispensing pumps, we use a unique approach in the form of syringe-type delivery that both accurately dispenses the liquid and uses a much smaller amount of liquid. Annual savings on reagent will be easily in the hundreds of dollars each year.

TPO: Once the analysis is complete, how does this device communicate with the treatment process so that phosphate precipitants are dosed accurately?

Smith: The CA80PH orthophosphate analyzer is built on our Liquiline transmitter platform, which is used across all our analytical sensors and technologies. Customers can integrate our colorimetric analyzers into their control system using a variety of input/output capabilities, anywhere from an analog signal to a range of digital communication protocols. The analyzer takes a measurement and communicates a value back to the process control system in a 4-20mA signal or a digitally communicated signal. That value is used to provide control over dosing for precipitation purposes or for monitoring of phosphate levels.

TPO: What ensures the continued integrity of the instrument and its accuracy?

Smith: Users can monitor the instrument’s performance through the Liquiline transmitter platform. Through built-in diagnostics, they can record and monitor inside the instrument. There are data log books for analysis, diagnostics and calibration, and they keep a record that users can output for recordkeeping, compliance and tracking of diagnostic events. In addition, the Liquiline transmitter has the capability to be outfitted with a Web server. Users can then pull up a Web page remotely on a PC or smart device and monitor and evaluate the analyzer.

TPO: What colorimetric measuring methods does this device use?

Smith: It is available with both standardized phosphate-measuring methods covering all applications: molybdenum blue and vanadate molybdate (yellow method). By default, users will deploy one of those two methods, depending on the concentration they are measuring. To measure phosphate from 0.5 to 10 ppm, they would use the blue method. To measure up to 50 ppm, they would use the yellow method.

TPO: Will users find this device easy to maintain and service?

Smith: In the design of this analyzer, we made the maintenance virtually tool-free. For any part that has to be replaced or for any routine service, the user does not need any tools. It can all be done with just the fingers. It makes maintenance extremely easy.


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