Memosens CPS76E

Summary

Product identification

Memosens CPS76E pH/ORP sensor for process technology with Memosens 2.0 technology.

Application

Designed for process technology and monitoring of processes with:

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

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

Features and Benefits

• Simultaneous measurement of pH, ORP, and rH value (in rH mode).
• Platinum electrode for measuring reference impedance.
• Acrylamide-free gel bridging electrolyte, sterilizable and resistant to chemical corrosion.
• Suitable for CIP/SIP cleaning and autoclavable.
• Long service life due to poison-resistant reference with ion trap.
• Integrated NTC 30K temperature sensor for effective temperature compensation.
• Glass breakage and blockage detection by measuring:
  • Resistance of glass membrane
  • Reference impedance
• Memosens technology provides:
  • Maximum process safety via non-contact, inductive signal transmission.
  • Digital data transmission for data security.
  • Easy handling as sensor data are saved in the sensor.
  • Predictive maintenance through recording sensor load data.

Measuring Principles

• pH Measurement: Utilizes the electrochemical potential generated by the membrane glass, which depends on the H⁺ ion accumulation. An integrated Ag/AgCl reference system is used. The Nernst equation converts measured voltage to the pH value.
• ORP Measurement: Measures the potential using a platinum or gold electrode, with an integrated Ag/AgCl reference system.
• rH Measurement: Calculated using the formula: rH = 2 * (mV/S) + 2 pH. Requires simultaneous measurement of pH and ORP.
  • rH values indicate the oxidation or reducing power of a process solution.
  • 0 to 9: Strong reducing power
  • 9 to 17: Weak reducing power
  • 17 to 25: Undetermined medium
  • 25 to 34: Weak oxidizing power
  • 34 to 42: Strong oxidizing power

Measuring System Components

A complete measuring system includes:

• pH/ORP sensor CPS76E
• 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.

Communication and Data Processing

• Digital sensors with Memosens technology must be connected to Memosens-compatible transmitters.
• Sensor data stored include: Manufacturer data, serial number, order code, calibration data, application data, operational history, etc.
• This data can be displayed with specific Endress+Hauser transmitters and software.

Input

Measured Variable

• pH value
• ORP
• rH value
• Temperature

Measuring Range

• ORP: –1500 to 1500 mV
• 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 TU: Ag/AgCl reference lead with ion trap, gel KCl, 3M, AgCl-free bridging electrolyte.
• TP: Ag/AgCl reference lead with ion trap, gel KCl, 3M, AgCl-free bridging electrolyte, pressurized to 7 bar (102 psi) absolute.

Installation

• Orientation: Install with an angle of inclination of at least 15° from the horizontal to prevent air bubble formation. Upside-down installation is possible depending on the order code for the reference system.
• Tightening Torque: 3 Nm (2.21 lbf ft) by hand (for Endress+Hauser assemblies).

Environment

• Ambient Temperature Range: 0 to 50 °C (32 to 122 °F). Avoid temperatures below freezing.
• 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): Meets EN 61326-1, EN 61326-2-3, and NAMUR NE21.

Process

• Process Temperature Range: 0 to 140 °C (32 to 284 °F) for Applications B and H, and Version TB. For Versions TU and TP, 0 to 140 °C (32 to 284 °F), with 140 °C (284 °F) limited to sterilization. Continuous operation limited to 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: Minimum 10 μS/cm (at atmospheric pressure, without flow).

Mechanical Construction

• Dimensions: Various installed lengths available: 120 mm (4.72 in), 225 mm (8.86 in), 360 mm (14.17 in), 425 mm (16.73 in).
• Weight: Ranges from 40 g (1.4 oz) to 100 g (3.5 oz) depending on the installed length.
• Materials:
  • Sensor Shaft: Glass
  • pH Membrane Glass: Type B, Type N
  • Metal Lead: Ag/AgCl
  • Reference: Ceramic junction (zirconium dioxide)
  • ORP Measuring Element: Platinum
  • O-ring: FKM
  • Process Coupling: PPS fiber-glass reinforced
  • Plug-in Head: Memosens plug-in head (pressure resistant to 16 bar (232 psi) relative).
• Process Connections: Pg 13.5.

Certificates and Approvals

• CE marking
• Ex Approval: ATEX, IECEx, NEPSI, CSA C/US, Japan Ex, INMETRO (various classifications including Ex ia IIC T3/T4/T6 Ga). Hazardous area versions are indicated by a red/orange ring on the plug-in head.
• TÜV certificate for Memosens plug-in head (pressure resistance 16 bar (232 psi) relative).
• EAC conformity.

Accessories

A range of assemblies, buffer solutions, and measuring 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