Memosens CPF81E

Summary

Product identification

• Product name: Memosens CPF81E
• Product type: pH sensor for mining operations, industrial water and wastewater treatment
• Technology: Digital with Memosens 2.0 technology
• Document title: Memosens CPF81E
• Document number: TI01594C/07/EN/01.21
• Date: 2021-03-08

Application

• Flotation
• Leaching
• Neutralization
• Outlet monitoring
• Inlet and outlet monitoring

Key Features and Benefits

• KNO₃ electrolyte bridge for improved protection against electrode poisons such as S²⁻ or CN⁻ ions.
• Optional flat membrane for improved wear resistance.
• Threaded connection NPT ¾" top and bottom for easy installation.
• Integrated NTC 30K temperature sensor for temperature compensation.
• Protection guard against damage.
• Maximum process safety with non-contact, inductive signal transmission (Memosens technology).
• Data security through digital data transmission (Memosens technology).
• Easy sensor management: sensor data saved in the sensor for calibration and predictive maintenance.

Measuring Principle

The pH value is determined by an electrochemical potential generated by the membrane glass, which depends on the H⁺ ion concentration. An integrated Ag/AgCl reference system serves as the reference electrode. The measured voltage is converted to the pH value using the Nernst equation.

Measuring System

A complete measuring system comprises:

• Sensor CPF81E
• Transmitter (e.g., Liquiline CM44x/R or Liquiline M CM42)
• Memosens data cable (e.g., CYK10)

Communication and Data Storage (Memosens Technology)

Digital sensors with Memosens technology store various data, including:

• Manufacturing data (serial number, order code, date of manufacture)
• Calibration data (date, slope, zero point, offset, number of calibrations, history)
• Application data (temperature and pH application range, date of first commissioning, maximum temperature, hours of operation)
• Sensor load

These data can be displayed with transmitters like Liquiline CM42, CM44x, and Memobase Plus CYZ71D.

Operating Limits

• Application L:
  • pH: 0 to 14
  • Temperature: 0 to 110 °C (32 to 230 °F)
• Application N:
  • pH: 0 to 11
  • Temperature: 0 to 80 °C (32 to 176 °F)
• Process Pressure Range: 0.8 to 11 bar (11.6 to 159.5 psi) (absolute)
• Minimum Conductivity: 50 μS/cm (at atmospheric pressure, without flow)

Environment

• Ambient Temperature Range: 0 to 50 °C (32 to 122 °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): As per EN 61326-1:2013 and EN 61326-2-3:2013. For ESD > 2 kV to 8 kV: reduced accuracy ± 1.5 pH.

Mechanical Construction

• Housing, sensor shaft: PPS
• pH sensor (in contact with medium): Lead-free membrane glass, suitable for process applications
• Reference system: Double chamber with KNO₃ and KCl/AgCl gel electrolytes.
• Plug-in head: Memosens plug-in head for digital, non-contact data transmission. Pressure resistance: 16 bar (232 psi) (relative).
• Process connections: NPT ¾"
• Weight: 0.12 to 0.15 kg (0.26 to 0.33 lb), excluding cable.
• Dimensions: See diagrams in the original document for specific models (spherical or flat membrane).

Materials

• Housing, sensor shaft: PPS
• pH sensor: Lead-free membrane glass
• Double chamber reference system: KNO₃ and KCl/AgCl

Certificates and Approvals

• CE mark
• TÜV certificate for Memosens plug-in head (Pressure resistance 16 bar (232 psi) relative)
• EAC conformity

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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