ENDRESS+HAUSER  CA80AL-AAN11C101

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

• Monitoring of precipitants in drinking water and wastewater treatment plants
• Monitoring of geogenic entry of aluminum into drinking water reservoirs
• Monitoring of excess dosage of aluminum salts for phosphate precipitation

• 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

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.

Aluminum's favorable mechanical properties (malleability) make it one of the most commonly used light metals. The vehicle construction sector and packaging industry are among the primary consumers of aluminum. Aluminum occurs in the environment, particularly in soil and in many ores (feldspars, mica). A low concentration of aluminum is a natural constituent of surface water and groundwater. Aluminum in the soil can be released at low pH levels and thereby enter the groundwater and ultimately the food chain. Aluminum is predominantly harmful to human health. Various health effects of aluminum in food and deodorants are currently being debated. Higher concentrations in drinking water can be toxic. According to the German Drinking Water Ordinance (Trinkwasserverordnung), the limit concentration for aluminum is 0.2 mg/l Al.