Memosens CPS72E

Summary

Product Identification

• Product Name: Memosens CPS72E
• Product Type: ORP sensor for chemical process applications
• Technology: Digital with Memosens 2.0 technology

Application

Process technology and monitoring of processes with:

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

Approvals for use in hazardous areas (Zone 0, 1, and 2):

• ATEX
• IECEx
• CSA C/US
• NEPSI
• Japan Ex
• INMETRO

Key Features and Benefits

• Poison-resistant reference with improved ion trap for long service life.
• Bridging electrolyte free of silver ions and acrylamide-free.
• Integrated NTC 30K temperature sensor for effective temperature compensation.
• Suitable for CIP/SIP cleaning and autoclavable.
• Maximum process safety via non-contact, inductive signal transmission.
• Data security through digital data transmission.
• Easy to use with sensor data saved in the sensor.
• Predictive maintenance possible by recording sensor load data.

Measuring Principle

• Measured Variable: ORP (Oxidation-Reduction Potential)
• ORP Measurement: Measures the state of equilibria between oxidizing and reducing components. Uses a platinum or gold electrode with an integrated Ag/AgCl reference system.
• Temperature Measurement: Integrated NTC 30K temperature sensor.

Measuring System Components

A complete measuring system comprises:

• ORP sensor CPS72E
• Memosens data cable (CYK10 or CYK20)
• Transmitter (e.g., Liquiline CM42, CM44x)
• Assembly (e.g., immersion, flow, retractable)
• Optional: Automatic cleaning and calibration system (e.g., Liquiline Control CDC90)

Communication and Data Processing

• Memosens sensors must be connected to a Memosens transmitter.
• Digital sensors store data including: Manufacturer data, serial number, order code, date of manufacture, calibration data, operating data, and sensor load data.
• Stored data can be displayed with Liquiline CM42, CM44x, and Memobase Plus CYZ71D.
• Calibration can be performed independently of the measuring point.

Performance Characteristics

• Reference System: Ag/AgCl reference lead, bridging electrolyte: gel KCl, 3M, AgCl-free, with ion trap.
• Measuring Range:
  • ORP: –1500 to 1500 mV
  • Temperature: See Process temperature range below.

Installation

• Orientation:
  • Must be installed at an angle of at least 15° from the horizontal.
  • Upside-down installation is not permitted.
• Installation Instructions:
  • Ensure assembly thread, O-rings, and sealing surface are clean and undamaged.
  • Tighten sensor by hand to a torque of 3 Nm (2.21 lbf ft) when installing in Endress+Hauser assemblies.

Environmental and Process Limits

• Ambient Temperature Range:
  • Storage: 0 to 50 °C (32 to 122 °F)
  • Operating: Not specified in extract, but frost risk below 0 °C.
• Degree of Protection: IP 68 (10 m (33 ft) water column, 25 °C (77 °F), 45 days, 1 M KCl)
• Electromagnetic Compatibility (EMC): EN 61326-1:2013, EN 61326-2-3:2013, NAMUR NE21:2017.
• Process Temperature Range: 0 to 140 °C (32 to 284 °F)
• Process Pressure Range: 0.8 to 14 bar (11.6 to 203 psi) (absolute)
• Conductivity: ≥ 10 μS/cm (at atmospheric pressure, without flow)

Mechanical Construction

• Sensor Shaft Material: Glass
• ORP Measuring Element: Platinum
• Reference Lead Material: Ag/AgCl
• Junction Material: Ceramic, zirconium dioxide
• O-ring Material: FKM
• Process Coupling Material: PPS fiber-glass reinforced
• Plug-in Head: Memosens plug-in head, pressure resistance 16 bar (232 psi) (relative)
• Process Connections: Pg 13.5
• Installed Lengths: 120 mm (4.72 in), 225 mm (8.86 in), 360 mm (14.17 in), 425 mm (16.73 in)
• Weights: Corresponding to installed lengths: 40 g (1.4 oz), 60 g (2.1 oz), 90 g (3.2 oz), 100 g (3.5 oz).

Certificates and Approvals

• CE Marking: Complies with EU directives.
• Ex Approvals:
  • ATEX: II 1G Ex ia IIC T3/T4/T6 Ga
  • IECEx: Ex ia IIC T3/T4/T6 Ga
  • NEPSI: Ex ia IIC T3/T4/T6 Ga
  • CSA C/US: IS Cl. I Div 1, GP A-D Ex ia IIC T3/T4/T6; IS Cl. I Zone 0, AEx ia IIC T3/T4/T6
  • Japan Ex: Ex ia IIC T3/T4/T6 Ga
  • INMETRO: Ex ia IIC T3/T4/T6 Ga
• Other: EAC

Accessories

A variety of assemblies (Unifit, Cleanfit, Dipfit, Flowfit), buffer solutions (ORP buffer solution CPY3), and Memosens data cables (CYK10, CYK20) are available.

---

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