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Product Overview

E+H COA30 Dissolved Oxygen Sensor Calibration Cap

COA30

The Endress+Hauser COA30 is an essential calibration cap designed for dissolved oxygen sensors used in water, wastewater, and industrial liquid analysis. Featuring an airtight sealing mechanism and durable wetted materials, it allows fast, precise zero-point or air calibration for continuous optical and amperometric oxygen measurement probes.

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Endress Hauser COA30 calibration cap for dissolved oxygen sensor maintenance

Accurate Dissolved Oxygen Sensor Calibration with Endress+Hauser COA30

The Endress+Hauser COA30 calibration accessory is specifically engineered for routine maintenance, zero-point testing, and slope calibration of industrial dissolved oxygen (DO) sensors. Used across municipal wastewater treatment plants, industrial water treatment facilities, aquaculture monitoring, and chemical process analysis, the COA30 provides a controlled calibration environment to maintain high measurement precision for online oxygen electrodes.

Designed for Air Calibration and Zero-Point Verification

Dissolved oxygen probes, whether operating on optical luminescence (e.g., Memosens COS61D) or amperometric principles (e.g., COS51D/COS22D), require periodic air and zero-point calibration to account for membrane aging or electrolyte degradation. The COA30 calibration cap fits snugly over the sensor shaft, forming a sealed micro-chamber. Operators can fill the chamber with water-saturated air for 100% slope calibration or introduce a zero-oxygen chemical solution (such as sodium sulfite) to verify the sensor’s zero offset without exposing the entire probe assembly to harsh chemicals.

Key Performance Features & Technical Advantages

  • Airtight Moisture Retention: Equipped with high-grade sealing O-rings that maintain constant water-vapor saturation for precise 100% air calibration.

  • Chemical-Resistant Construction: Manufactured from durable, high-density polymers compatible with standard zero-point calibration reagents and industrial cleaning solutions.

  • Compact & Field-Ready Design: Lightweight and thread-compatible for direct attachment to standard Endress+Hauser oxygen sensor shafts, allowing fast field service without bulky lab equipment.

  • Protective Storage Functionality: Serves as a protective storage cap during sensor transport or temporary process shutdowns, keeping the membrane element moist and shielded from physical damage.

  • Universal Compatibility: Fits standard 12 mm or specialized process oxygen sensor diameters across the Memosens process analytical instrumentation portfolio.

Enhancing Process Control & Measurement Longevity

Regular calibration using dedicated accessories like the COA30 prevents measurement drift in aeration tanks, reducing blower energy consumption in wastewater aeration basins. By simplifying routine maintenance, the COA30 ensures reliable oxygen tracking and minimizes unexpected sensor downtime in process automation applications.

Applications

  • Wastewater Treatment: Aeration basin monitoring, denitrification tanks, and final discharge effluent control.

  • Industrial & Municipal Water: Drinking water treatment, reservoir water quality monitoring, and cooling tower management.

  • Aquaculture & Fish Farming: Dissolved oxygen control in fish ponds, hatcheries, and aquatic transport units.

  • Chemical & Biotechnology: Fermentation vessel monitoring, chemical waste streams, and process water analysis.

Technical Specifications 

Parameter / Feature Specification Details
Product Type Dissolved oxygen sensor calibration cap / storage chamber
Compatible Probes Memosens DO sensors (COS61D, COS51D, COS22D series)
Primary Functions 100% Air slope calibration, zero-point chemical calibration, sensor tip storage
Material Construction Polypropylene (PP) / POM / EPDM seals
Operating Temperature 0 °C to +50 °C (+32 °F to +122 °F)
Process Connection Slip-on / Threaded mechanical fit for standard DO sensor shafts
Chemical Resistance Resistant to water, dilute acid/alkali, sodium sulfite zero-solutions
Ingress / Sealing Rating Airtight O-ring compression fit

Endress+Hauser COA30 Oxygen CapFAQ

Q1: What is the main purpose of the Endress+Hauser COA30 calibration cap?

Answer: The COA30 is designed to hold water-saturated air or zero-point calibration solutions around a dissolved oxygen sensor tip for precise field calibration and sensor tip protection.

Q2: Which dissolved oxygen sensors are compatible with the COA30?

Answer: The COA30 is compatible with standard Endress+Hauser Memosens oxygen probes, including the COS61D optical DO sensor and COS51D/COS22D amperometric sensors.

Q3: Can the COA30 be used to store oxygen sensors during maintenance?

Answer: Yes, filling the cap with a small amount of clean water keeps the sensor tip humid, protecting the optical cap or sensing membrane during transport or tank cleaning.

Q4: How do you perform a zero-point calibration using the COA30?

Answer: Fill the COA30 chamber with a certified zero-oxygen solution (e.g., sodium sulfite solution), attach it securely over the sensor tip, and execute the zero-calibration routine on your transmitter.

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