Memosens CPS71E

Summary

Product identification

Memosens CPS71E pH sensor for chemical process applications. Digital sensor with Memosens 2.0 technology and a poison-resistant reference system utilizing an ion trap.

Application

Process technology and monitoring of processes with:

• Rapidly changing pH values
• High proportion of electrode poisons such as H₂S

Approvals for hazardous areas: ATEX, IECEx, CSA C/US, NEPSI, Japan Ex, and INMETRO for Zone 0, Zone 1, and Zone 2.

Features and Benefits

• Extended service life due to poison-resistant reference with improved ion trap.
• Bridging electrolyte free of silver ions and acrylamide.
• TP reference system: Pressurized reference for chemical processes with high concentrations of reference poisons.
• TU reference system: Suitable for upside-down installation with solidified gel in the internal reference lead.
• Integrated NTC 30K temperature sensor for effective temperature compensation.
• Choice of 1 or 3 ceramic junctions (TB and TC reference system).

Memosens Technology Advantages:

• Maximum process safety via non-contact, inductive signal transmission.
• Data security through digital data transmission.
• Ease of use with sensor data stored in the sensor.
• Predictive maintenance enabled by recording sensor load data (with Memobase Plus CYZ71D).

Measuring Principle

pH Measurement: The sensor generates an electrochemical potential based on the pH of the medium, which is converted to a pH value using the Nernst equation. An Ag/AgCl reference system is used as the reference electrode.

Measuring System Components:

• pH sensor CPS71E
• Memosens data cable (CYK10 or CYK20)
• Transmitter (e.g., Liquiline CM44, Liquiline CM42)
• Assembly (e.g., immersion, flow, retractable, permanent installation)
• Optional: Automatic cleaning and calibration system

Digital Data Storage

Digital sensors with Memosens technology store the following data:

• Manufacturer data (serial number, order code, date of manufacture)
• Calibration data (date, slope, zero point, offset of temperature sensor, number of calibrations, history, transmitter serial number)
• Operating data (temperature and pH application range, commissioning date, maximum temperature, hours of operation, sterilization count, CIP counter, sensor load)

This data can be displayed using Liquiline CM42, CM44x, and Memobase Plus CYZ71D.

Input

• Measured Variable: pH value, Temperature
• Measuring Range:
  • Application B: pH 0 to 14; Temperature 0 to 140 °C (32 to 284 °F)
  • Application H: pH 0 to 12; Temperature 0 to 140 °C (32 to 284 °F)

Performance Characteristics

• Reference System:
  • TB and TC: Ag/AgCl reference lead with ion trap, reference and bridging electrolyte 3 M KCl, acrylamide-free, flowable gel electrolyte.
  • TP: Ag/AgCl reference lead with ion trap, reference and bridging electrolyte 3 M KCl, acrylamide-free, flowable gel electrolyte, pressurized 7 bar (102 psi) absolute.
  • TU: Ag/AgCl reference lead with ion trap, reference and bridging electrolyte 3 M KCl, acrylamide-free, solidified gel electrolyte.

Installation

• Orientation:
  • TB, TC, and TP reference systems: Minimum 15° inclination from the horizontal; not to be installed upside-down.
  • TU reference system: Suitable for any installation angle, including upside-down.
• Torque: 3 Nm (2.21 lbf ft) when hand-tightening into assemblies.
• Commissioning: Requires removal of protective packaging, moistening cap, and initial immersion in buffer solution.

Environment

• Ambient Temperature Range: Not to be used below –15 °C (5 °F).
• 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): Interference emission and immunity as per EN 61326-1:2013.

Process

• Process Temperature Range: 0 to 140 °C (32 to 284 °F). For TP/TU versions, 140 °C (284 °F) is for sterilization only. Continuous operation maximum 100 °C (212 °F) due to pressure loss.
• Process Pressure Range:
  • Application B: 0.8 to 14 bar (11.6 to 203 psi) absolute.
  • Application H: 0.8 to 7 bar (11.6 to 101.5 psi) absolute.
• Conductivity: 10 μS/cm (at atmospheric pressure, without flow).

Mechanical Construction

• Dimensions: Various installed lengths available: 120 mm, 225 mm, 360 mm, 425 mm.
• Weight: Ranges from 40 g to 100 g depending on installed length.
• Materials: Glass sensor shaft, FKM O-ring, PPS fiber-glass reinforced process coupling, NTC 30K temperature sensor, Memosens plug-in head.
• Plug-in Head Pressure Resistance: 16 bar (232 psi) relative.
• Process Connections: Pg 13.5.

Certificates and Approvals

• CE mark
• Ex Approvals: ATEX, IECEx, NEPSI, CSA C/US, Japan Ex, INMETRO (specific classifications provided in the document).
• EAC conformity.
• TÜV certificate for Memosens plug-in head (16 bar relative pressure resistance).

Accessories

A range of assemblies, buffer solutions, and Memosens data cables are available.

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Disclaimer: This extraction may miss figures, footnotes, or revisions. Contractual data must match the OEM PDF revision used on the project.

Official datasheet (PDF)

Lenntech datasheet mirror