Nutrient Analyzers & Sensors

Nutrient Analyzers & Sensors

Endress+Hauser’s nutrient analyzers and sensors provide high‑precision, online quantification of key inorganic nutrients, ammonium (NH₄⁺), nitrate (NO₃⁻), nitrite (NO₂⁻), orthophosphate (PO₄‑P) and total phosphorus (TP), and, where a full nutrient balance is required, total nitrogen (TN). Built on the Liquiline/Memosens platform, the portfolio spans wet‑chemical analyzers for regulatory reporting and reagent‑free inline sensors for continuous process control in water, wastewater, and utilities. This combination gives designers flexibility to mix certified methods with fast trend measurements at the same site.

The Liquiline System CA80 analyzer family covers the principal nutrient parameters: CA80AM (ammonium), CA80NO (nitrite), CA80PH (orthophosphate), CA80TP (total phosphorus), and CA80TN (total nitrogen). These analyzers use recognized colorimetric/UV methods in an autonomous cabinet with automatic calibration and cleaning to stabilize performance and reduce operator time. They also support “plug & play” expansion with up to four additional Memosens sensors for a broader process picture and remote diagnostics for documentation and troubleshooting. Low reagent consumption and modular sample paths simplify lifecycle cost and service.

For fast, reagent‑free measurement directly in the basin or channel, Endress+Hauser offers two digital sensors. ISEmax CAS40D is an ion‑selective electrode (ISE) system for ammonium and nitrate trend monitoring, designed for immersion service with robust membranes, optional pneumatic cleaning, and Memosens connectivity, ideal for aeration control. Viomax CAS51D is an optical UV sensor that measures nitrate (or SAC) by absorption near 214 nm, enabling continuous monitoring without chemicals and with a self‑cleaning design for low maintenance. Together, these sensors provide immediate feedback to optimize biological processes and cut energy use.

Reliable nutrient analysis depends on representative, particle‑free samples. Liquiline System sample preparation modules address this: CAT810 provides microfiltration for pressurized lines; CAT820 uses a ceramic membrane (≈0.1 µm) with backflush for aeration basins, outlets, or surface water; and CAT860 is a rugged, automatically backflushed unit for demanding inlet conditions. These modules are controlled by the analyzer for synchronized purge/cleaning cycles and are fully integrated into the Liquiline diagnostics concept, reducing fouling risk and downtime at tough measuring points.

Orthophosphate control via CA80PH supports precise precipitant dosing and sludge minimization using the standardized molybdenum‑blue method (EN ISO 6878), ensuring lab‑comparable data. TN with CA80TN uses alkaline persulfate digestion and UV photometry (e.g., per EN ISO 11905‑1 / HJ636), consolidating organic and inorganic nitrogen into one online value for compliance and process insight. On the operational side, reagent‑free CAS40D/CAS51D trend signals drive air‑and‑polymer savings by stabilizing nitrification/denitrification setpoints; automatic calibration/cleaning and low reagent use in CA80 analyzers lower OPEX while preserving data integrity with remote access.

Integration and scalability are straightforward. Liquiline CM44x transmitters (CM442/CM444/CM448 and DIN‑rail CM44xR) accept up to eight Memosens sensors and offer PROFINET, EtherNet/IP, Modbus TCP/RS‑485, PROFIBUS and an integrated web server for asset access. Heartbeat Technology adds continuous diagnostics and point verification to support condition‑based maintenance and proof testing. This common platform allows analyzers and inline sensors to share infrastructure for signals, power, and enclosure space, simplifying engineering and lowering installed cost.

Typical applications span municipal and industrial wastewater: ammonium control and aeration optimization in activated‑sludge basins (CAS40D, CA80AM); denitrification monitoring and effluent assurance via nitrate/nitrite (CAS51D, CA80NO); and chemical phosphorus removal with orthophosphate and TP analyzers (CA80PH/CA80TP). Drinking water and food producers use nitrite monitoring for limit compliance, while surface‑water stations apply UV nitrate for catchment surveillance. Selecting analyzer‑grade measurements at compliance points and pairing them with reagent‑free basin sensors upstream yields both reportable values and fast control dynamics.

Vector, your Authorized Endress+Hauser Representative