Endress+Hauser Memosens Cps11e/Cps77e pH Meter Sensors Orbisint Cps11d/Cps11d-7ba21

1. Overview

• Model: Orbisint CPS11D
• Type: Digital pH sensor / pH electrode
• Technology: Uses Memosens digital technology with non-contact inductive signal transmission.
• Applications: Suitable for industrial processes and environmental monitoring.
• Status: Some channels mark it as “retired” and the recommended successor is CPS11E.

2. Key Features

Structure & Materials

• Glass electrode with PTFE (polytetrafluoroethylene) ring diaphragm.
• Built-in temperature sensor (typically NTC 30k) for temperature compensation.
• Electrode diameter: ~12 mm.
• Multiple lengths available (120 mm, 225 mm, 360 mm, etc.).

Measurement Range

• pH: 0–14 (for standard BA version).
• Minimum conductivity requirement: ~50 µS/cm.

Operating Temperature & Pressure

• Process temperature: 0–135 °C (depends on version).
• Maximum process pressure: up to ~16 bar.

Protection & Interface

• Protection rating: IP68 (depending on connector type).
• Non-contact Memosens signal transmission improves process safety.
• Digital connector: Memosens plug interface.

Maintenance & Reliability

• Low-maintenance design with PTFE diaphragm.
• Long service life due to double-chamber design and diffusion path.
• Predictive maintenance possible: stores sensor parameters and usage history in the sensor.

Options / Advanced Features

• Salt ring option for low-conductivity media (e.g., boiler feedwater).
• Poison-resistant reference versions for ion-contaminated applications.
• Certifications: ATEX, FM, CSA (suitable for hazardous areas).

3. Typical Applications

• Chemical industry (strong acids/bases)
• Pulp and paper industry
• Power plants (boiler water monitoring, desulfurization systems)
• Waste incineration monitoring (flue gas treatment)
• Water treatment: drinking water, cooling water, groundwater

4. Pros and Cons

Pros:

• High reliability: resistant to high pressure and temperature
• Low maintenance: PTFE diaphragm reduces fouling
• Digital Memosens technology: safe data transmission, easier calibration and maintenance
• Versatile: suitable for high-pressure, low-conductivity, or harsh chemical environments

Cons / Limitations:

• Minimum conductivity requirement may limit ultra-pure water applications
• Being an older model, support may decline; CPS11E is the newer alternative
• Glass electrode is fragile and needs careful handling

5. Successor / Upgrade Recommendation

• CPS11E is the recommended next-generation replacement for CPS11D.
• Choose specific versions (BA, FA, AS, etc.) depending on temperature, pressure, and conductivity requirements.

6. Summary

The Orbisint CPS11D is a mature, reliable digital pH sensor ideal for industrial process and environmental monitoring. Its key strengths are low maintenance, high stability, digital communication, and suitability for harsh process conditions, making it suitable for chemical, power, and water treatment industries.