Oxygen Sensors & Transmitters

Oxygen Sensors & Transmitters

Endress+Hauser’s Oxygen Sensors & Transmitters portfolio covers dissolved‑oxygen (DO) measurement from trace to saturation across water/wastewater, chemicals, power, life sciences, food & beverage, and aquaculture. Users can choose between optical (luminescence quenching) and amperometric (membrane/electrolyte) sensors, all on the Memosens digital platform for robust, moisture‑proof plug‑and‑play operation. Paired with Liquiline transmitters, the same platform scales from a single point to multi‑parameter skids with unified diagnostics and lifecycle tools.

For general utility and wastewater duty, the optical Oxymax COS61D delivers fast, drift‑free DO with minimal maintenance. Its oxygen‑selective fluorescent spot and reference LED provide stable values without polarization, while the inductive Memosens coupling enables lab calibration and reliable data transfer in wet environments. This combination makes COS61D a solid choice for basins, channels, and process water where availability and low OPEX matter.

Where hygiene and sterilization are mandatory, Memosens COS81D (and successor variants) brings an EHEDG/ASME BPE‑aligned optical design suited to fermenters and drinking‑water processes. Interchangeable sensor caps address liquid- or gas-phase work; the design tolerates CIP/SIP and even autoclaving, and the sensor can be used both in-process and in the laboratory to keep calibration strategies consistent. COS81D is also specified for oxygen monitoring in gases, supporting inertization and headspace control needs in life science and food applications.

When electrochemical behavior is preferred, e.g., very low DO or specific regulatory methods, the Oxymax COS22D/COS22E amperometric family offers linear, wide‑range measurement with sterilizable, autoclavable construction for clean and sterile service. Variants cover trace DO in water and oxygen measurement in gaseous media (for inertizations or quality checks), with outputs available as concentration, % saturation, or partial pressure. As with any membrane sensor, regular electrolyte/membrane service applies, but the method remains a proven choice at the low end of the range.

For municipal/industrial wastewater and utilities, the Oxymax COS51D and the Memosens 2.0 COS51E address continuous DO control with high accuracy and moisture‑resistant digital connectivity, ideal for aeration basins, clarifiers, and process‑water loops. Complete measuring points are easily engineered using standard assemblies: Flowfit COA250 for flow cells (fast response, self‑venting), Flexdip CYA112 for rugged immersion in open basins, or retractable Cleanfit COA451 where isolation from the process is required for service.

Liquiline transmitters unify setup, integration, and diagnostics across DO and other parameters. The CM442/CM444/CM448 platform connects up to 2/4/8 Memosens sensors with automatic recognition and Heartbeat‑enabled diagnostics/verification. For compact points and retrofits, CM72 provides two‑wire 4–20 mA operation, while CM82 adds HART and secure Bluetooth for convenient access in tight or hazardous locations. Where remote accessibility is key, CM44P includes an integrated web server for configuration and asset access.

Why it matters: precise, stable DO is the lever for energy‑efficient aeration, reliable nitrification/denitrification, and effluent compliance in wastewater; it safeguards fermentation outcomes and hygienic boundaries in life sciences; it verifies deaeration and inertization in power and chemical utilities; and it supports fish welfare and yield in aquaculture. Memosens 2.0 underpins this with moisture immunity, lab calibration, and extended data for predictive maintenance, while Heartbeat Technology adds standardized diagnostics and verification to document performance and optimize service intervals.

Vector, your Authorized Endress+Hauser Representative