Endress+Hauser CPF81D-7LH21 Digital Electrode

Description

Endress+Hauser CPF81D-7LH21 Digital Electrode

Product Dimensions：

The Endress+Hauser CPF81D-7LH21 is a high-performance pH sensor from the Memosens Orbipac family. It is specifically designed for industrial water treatment and process applications where a robust, flat-surface sensor is needed to resist fouling and clogging.

Product Detailed Description

The CPF81D is a digital sensor featuring Memosens technology. Unlike traditional analog sensors, Memosens converts the pH signal into a digital telegram within the sensor head itself. This eliminates problems caused by moisture, corrosion, or electromagnetic interference. The “7LH21” configuration typically denotes a specific version with a flat glass membrane, an integrated temperature sensor, and a built-in assembly for immersion or flow-through installation.

Technical Parameters

Product Advantages

• Memosens Intelligence: Provides plug-and-play functionality. Calibration data is stored in the sensor head, allowing you to calibrate sensors in a lab and “hot-swap” them in the field without recalibrating at the transmitter.
• Fouling Resistance: The large, flat PTFE diaphragm and flush-mounted glass membrane are highly resistant to buildup. This is ideal for applications with high solids content or fibrous media.
• Built-in Protection: The sensor is housed in a rugged PPS (Polyphenylene sulfide) body that protects the glass electrodes from mechanical impact.
• Moisture Immunity: Because the connection between the sensor and the cable is inductive (non-contact), it is completely unaffected by humidity or water ingress, which are the leading causes of failure in analog pH loops.

Important Considerations & Precautions

• Storage: Never allow the sensor tip to dry out. Always store the sensor in the original soaking cap filled with 3M KCl electrolyte or a pH 4 buffer solution.
• Cleaning: Even though the flat surface resists fouling, it may require periodic cleaning. Use only soft cloths or chemical cleaning agents recommended by E+H (like dilute HCl for lime scale) to avoid scratching the glass.
• Cable Limits: While Memosens is digital, ensure you are using the correct CYK10 data cable. Standard coaxial cables will not work.
• Orientation: The sensor should be installed at an angle of at least 15° from the horizontal to ensure that the internal air bubble does not settle on the pH glass, which would break the electrical circuit.

Product Applications

The CPF81D-7LH21 is a workhorse in environments where standard sensors fail:

• Wastewater Treatment: Monitoring pH in inlet/outlet channels where grease and suspended solids are present.
• Cooling Water: Controlling chemical dosing in cooling towers to prevent scaling and corrosion.
• Process Water: Used in neutralisation stages in chemical processing.
• Primaries & Metal: Monitoring wastewater in mining operations where abrasive particles might damage protruding glass bulbs.

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