Memosens 61E

Summary

Product Identification

Memosens CPS61E pH sensor for bioreactors in life sciences and for the food industry.

Application

Hygienic and sterile applications (sterilizable, autoclavable) in:

• Bioreactor/fermenter
• Biotechnology
• Pharmaceutical industry
• Foods

Approvals for use in explosive atmospheres (Zone 0, 1, 2): ATEX, IECEx, CSA C/US, NEPSI, JPN Ex, INMETRO.

Benefits

• Biocompatibility (in vitro cytotoxicity and in vivo) tested for relevant parts in contact with the process medium.
• Suitable for CIP/SIP cleaning and autoclavable up to 140 °C (284 °F).
• Pressurized reference (TP reference system) for fermentation processes, with integrated pressure indicator.
• Alternative TU reference system for upside-down installation with solidified gel.
• Long service life with poison-resistant reference and improved ion trap.
• Bridging electrolyte is silver ion-free and acrylamide-free.
• Integrated NTC 30K temperature sensor for compensation.
• Parts in contact with the process medium are not derived from animals, minimizing TSE/BSE risk per EMA.
• Memosens technology provides:
  • Maximum process safety via non-contact inductive signal transmission.
  • Digital data transmission ensuring data security.
  • Ease of use with sensor data stored in the sensor.
  • Predictive maintenance capabilities by recording sensor load data.

Measuring Principle

• pH Measurement: The electrode's membrane glass generates an electrochemical potential dependent on the medium's pH, due to H⁺ ion accumulation. An Ag/AgCl reference system is used. The measured voltage is converted to a pH value using the Nernst equation.
• Temperature Sensor: Integrated NTC 30K for temperature compensation.

Measuring System Components

A complete measuring system includes:

• pH sensor CPS61E
• Memosens data cable (CYK10 or CYK20)
• Transmitter (e.g., Liquiline CM44, Liquiline CM42)
• Assembly (e.g., retractable Cleanfit CPA875, permanent installation Unifit CPA842)
• Optional: Automatic cleaning and calibration system (e.g., Liquiline Control CDC90)

Communication and Data Processing

• Digital sensors with Memosens technology must be connected to a Memosens transmitter.
• The sensor stores data including: manufacturer details, serial number, order code, calibration data, calibration history, operating data, temperature and pH application ranges, commissioning date, operational limits, sterilization cycles, CIP counter, and sensor load.
• This data can be displayed using Liquiline CM42, CM44x, CM44x/R, and Memobase Plus CYZ71D.

Dependability and Reliability

• Integrated electronics store calibration and operational data.
• Automatic data transfer to the transmitter upon connection.
• Sensor calibration and adjustment can be performed independently of the measuring point.
• Allows for easy calibration in a lab environment and quick replacement of pre-calibrated sensors.
• Enables accurate maintenance interval definition and predictive maintenance.
• Sensor history can be documented externally.

Integrity and Data Security

• Measured values are digitized within the sensor and transmitted wirelessly, preventing interference.
• Reliable detection and reporting of sensor failure or connection interruptions.

Safety

• Inductive transmission via non-contact connection ensures process safety.
• Eliminates issues caused by moisture, such as connection corrosion or distorted readings.
• Transmitter is galvanically decoupled from the medium.
• Electromagnetic compatibility (EMC) is ensured through screening.
• Intrinsically safe electronics allow operation in hazardous areas with appropriate Ex approvals.

Input

• Measured Variable: pH value, Temperature
• Measuring Range:
  • pH: 0 to 14
  • Temperature: 0 to 100 °C (32 to 212 °F)
• Conductivity: Minimum 100 μS/cm (at minimized flow, constant pressure, and temperature).

Performance Characteristics

• Reference System:
  • TP reference system: Ag/AgCl reference lead with ion trap, 3 M KCl electrolyte (flowable gel), pressurized to 7 bar (102 psi) absolute. Features an integrated pressure indicator.
  • TU reference system: Ag/AgCl reference lead with ion trap, 3 M KCl electrolyte (solidified gel).

Mounting and Installation

• Orientation:
  • TP reference system: Minimum 15° angle from the horizontal; not permitted to be installed upside-down.
  • TU reference system: Suitable for upside-down installation; can be installed at any angle.
• Installation Torque: 3 Nm (2.21 lbf ft) when installing in Endress+Hauser assemblies.
• Hygienic Requirements: For 3-A or EHEDG compliance, use certified assemblies, assemblies with protective guards, ensure self-draining installation, and avoid dead areas.

Environment

• Ambient Temperature Range: Not specified, but avoid use below 0 °C (32 °F) due to risk of frost damage.
• Storage Temperature: 0 to 50 °C (32 to 122 °F).
• Degree of Protection: IP 68 (10 m (33 ft) water column, 25 °C (77 °F), 45 days, 1 M KCl).
• Electromagnetic Compatibility (EMC): Complies with EN 61326-1, EN 61326-2-3, and NAMUR NE21.

Process

• Process Temperature Range:
  • Application M: 0 to 100 °C (32 to 212 °F); up to 130 °C (266 °F) for sterilization.
  • Application N: 0 to 100 °C (32 to 212 °F); up to 140 °C (284 °F) for sterilization.
• Process Pressure Range: 0.8 to 7 bar (11.6 to 101.5 psi) absolute for Application M and N.
• Pressure-Temperature Ratings: See the pressure-temperature diagram in the document for specific application limits.

Mechanical Construction

• Design: Available in several installed lengths: 120 mm (4.72 in), 225 mm (8.86 in), 360 mm (14.17 in), 425 mm (16.73 in).
• Weight: Varies by installed length from 40 g (1.4 oz) to 100 g (3.5 oz).
• Materials:
  • Sensor Shaft: Glass
  • pH Membrane Glass: Type N
  • Metal Lead: Ag/AgCl
  • Junction: Ceramic (zirconium dioxide)
  • O-ring: FKM
  • Process Coupling: PPS fiber-glass reinforced
  • Nameplate: Ceramic metal oxide
  • Temperature Sensor: NTC 30K
  • Plug-in Head: Memosens plug-in head (pressure resistance 16 bar (232 psi) relative).
• Process Connections: Pg 13.5

Certificates and Approvals

Current certificates and approvals are available via the Product Configurator on www.endress.com.

Scope of Delivery

• Sensor (as ordered)
• Operating Instructions
• Safety instructions for hazardous areas (if applicable)

Accessories

• Assemblies: Unifit CPA842, Cleanfit CPA875
• Buffer Solutions: CPY20
• Measuring Cables: Memosens data cable CYK10, Memosens laboratory cable CYK20

---

Disclaimer: This extracted summary may not include all figures, footnotes, or revisions. Contractual data must match the OEM PDF revision used for the project.

Official datasheet (PDF)

Lenntech datasheet mirror