Analyser measures total phosphorus on-line

18th September 2017
Posted By : Anna Flockett
Analyser measures total phosphorus on-line

Introducing the Liquiline CA80TP phosphorus analyser, Endress+Hauser have designed it for monitoring industrial wastewater, and inlet and outlet streams of municipal wastewater treatment plants. The CA80TP uses a thermal digestion technique along with colourimetric analysis, requiring only a small quantity of reagents. With online measurement there is no waiting for time-consuming lab analysis.

In most industrial and water and wastewater plants, phosphorus measurements require that a technician pull a sample manually and take it to a lab for analysis. With the CA80TP, the phosphorus measurement is performed on line, as accurate as a lab analyser, and much less time consuming.  

The CA80TP measures phosphorus in ranges of 0.05-10mg/l or 0.5-50 mg/l. It has two 4-20mA outputs with the option for additional outputs including Modbus RS485, Modbus TCP and EtherNet/IP. The 4-20mA outputs transmit the phosphorus measurement value. The other outputs can be used to transmit the process variable, plus status and diagnostic information.

Phosphorus occurs as phosphate in natural water systems and in wastewater. Phosphates enter the water from fertilisers, biological and industrial waste and wastewater - and from substances added in water treatment for corrosion protection. Phosphate is a nutrient, so over-enrichment of phosphate (eutrophication) leads to excessive growth of aquatic plants. When these plants die in the fall, the decay of the additional biomass increases the rate of oxygen consumption. In extreme cases, this may lead to fish kills and decrease the quality of the water system.

To determine total phosphorus, a sample must be digested. Samples are drawn from the process using a suction strainer or can be taken from a bypass piping system using an Endress+Hauser Y Strainer.

A precise sample volume is digested at high temperature with a digestion reagent. An optical dosing unit, used to dose sample and reagents, uses a redundant light barrier for a high level of reliability, guaranteeing precise and reproducible results from extremely small volumes of reagent. The temperature in the reaction vessel is kept constant to ensure complete digestion takes place within a short period of time. The CA80TP has a software-controlled safety cover to prevent access to the digestion reactor when it is under operation.

Following digestion, the sample is mixed with colourimetric analysis reagents, causing a characteristic change in the sample colour. A photometer measures the level of absorption by the sample at defined wavelengths.

The analyser can be equipped with an energy-efficient cooling system to maintain reagent quality and increase lifespan. Automatic cleaning and calibration functions ensure the analyser works reliably and without manual intervention over an extended period of time.

Downloads


You must be logged in to comment

Write a comment

No comments




Sign up to view our publications

Sign up

Sign up to view our downloads

Sign up

GISEC Global
23rd April 2024
United Arab Emirates Halls 2-8 - Dubai World Trade Centre
The Magnetics Show US
22nd May 2024
United States of America The Pasadena Convention Center
2024 World Battery & Energy Storage Industry Expo (WBE)
8th August 2024
China 1st and 2nd Floor, Area A, China Import and Export Fair Complex