ENDRESS+HAUSER  CA80FE-AAM21C101

Integrated controller with up to 2 measuring channels and digital Memosens technology

Application

• Monitoring of the remaining iron concentration following precipitation, flocculation and filtration processes
• Monitoring of iron-rich process waters
• Quality control of raw water for the food industry
• Quality control of drinking water

Your benefits

• Easy upgrade to measuring station by connecting with up to four Memosens sensors
• Low maintenance costs thanks to long reagent life
• Digital communication for remote access
• Two-channel device available
• Supports predictive maintenance with advanced diagnostic functions
• Digital fieldbuses (Profibus DP, Modbus TCP, Modbus RS485 and Ethernet IP) and web server

Colorimetric measuring principle

After application-specific sample preparation, some of the permeate is pumped into the mixing/ reaction chamber. The specific color reagent is metered exactly in a defined mixture ratio. The chemical reaction causes the characteristic change in the color of the sample. The multispectral photometer measures the level of absorption by the sample or the stain solution at defined wavelengths. The analyzed wavelengths, and their relationships to one another, are parameter- specific.

Based on proportionality the amount of light absorption is a direct indicator of the concentration of the parameter under analysis in the sample. To compensate for any interference influences resulting from turbidity and fouling, as well as from the deterioration and aging of the LEDs, a reference measurement is performed before the actual measurement. This reference signal is subtracted from the measuring signal. The temperature in the photometer is kept constant to ensure a reproducible reaction that takes place with a short period of time.

Iron

After aluminum, iron is the second most common metal and the fourth most abundant element in the Earth's crust, which explains its omnipresence. Nevertheless, natural bodies of water only contain small concentrations of iron (II) or iron (III) ions. Larger concentrations of iron can enter the surface water through leaching from natural deposits or from industrial wastewater, mining wastewater or pickling discharge. Iron is an important trace element. A normal diet contains enough iron to meet the body's iron needs. The presence of iron in drinking water is more a nuisance than a health hazard. Water that contains iron discolors clothes and porcelain and gives the water a bitter taste if it is present in higher concentrations (0.1 mg/l Fe 2+ or 0.2 mg/l Fe 3+ ). Therefore the limit concentration according to the German Drinking Water Ordinance is 0.2 mg/l Fe.