Memosens COS81E

Summary

Product identification

Memosens COS81E is a hygienic optical oxygen sensor utilizing Memosens 2.0 technology.

Application

This sensor is suitable for:

• Oxygen control in fermenters (pharmaceutical, biotechnology).
• Quality control in the food industry.
• Monitoring of explosive atmospheres with O₂ concentration ≥ 2%.

It holds approvals for hazardous areas including ATEX, IECEx, CSA C/US, NEPSI, JapanEx, and INMETRO, covering Zone 0, 1, 2 (gas) and Zone 20, 21, 22 (dust). CSA C/US approval also extends to Class I Division 1 (gas) and Class II Division 1 (dust).

Key Features and Benefits

• Accurate Measurements: Long-term stability and permanent self-monitoring.
• Sterilization: Can be sterilized up to 140 °C (284 °F) and is autoclavable.
• Material: Stainless steel 1.4435 (AISI 316L) suitable for pharmaceutical demands.
• Protection: IP68 rated.
• Certifications: Certified according to EHEDG and complies with relevant sections of ASME-BPE.
• Documentation: Available with a certificate of conformity for pharmaceutical requirements and an inspection certificate EN 10204-3.1. Materials comply with FDA and/or USP class VI specifications.

Memosens Technology Advantages

• Maximum process safety.
• Data security through digital transmission.
• Ease of use with sensor data saved on the sensor.
• Predictive maintenance enabled by recording sensor load data.

Measuring Principle

The sensor utilizes luminescence quenching. Oxygen-sensitive markers in an optically active layer respond to light pulses. The decay time and intensity of the response signals are dependent on oxygen content and partial pressure.

Measuring System

A complete system includes:

• Memosens COS81E oxygen sensor
• Measuring cable CYK10
• A transmitter (e.g., Liquiline CM42, CM44x/R, CM44P, CM72/82, CML18)
• Optional: Assembly (e.g., Unifit CPA842, Flowfit CYA21, Cleanfit CPA875)
• Optional: Memosens analog converter CYM17 for analog controllers.

Dependability

• Reliability: Memosens technology digitizes data within the sensor, ensuring reliable detection and reporting of sensor failures or connection interruptions.
• Maintainability: Integrated electronics store calibration data and operational history, allowing for easy calibration independent of the measuring point and enabling predictive maintenance.
• Integrity: Inductive, non-contact connection prevents issues from moisture and corrosion, ensuring maximum process safety and EMC compliance.

Input

Measured Variables

• Dissolved oxygen: [mg/l, µg/l, ppm, ppb or %SAT or hPa]
• Oxygen (gaseous): [hPa or %Vol]
• Temperature: [°C, °F]

Measuring Ranges (at 25 °C and 1013 hPa)

• c-shaped:
  • 0.004 to 26 mg/l
  • 0.05 to 285 % SAT
  • 0.1 to 600 hPa
• u-shaped:
  • 0.004 to 30 mg/l
  • 0.05 to 330 % SAT
  • 0.1 to 700 hPa

The sensor has an operational range up to 1000 hPa.

Performance Characteristics

• Response Time (from air to nitrogen at reference conditions):
  • t<0xE2><0x82><0x90>₀: < 10 s
  • t<0xE2><0x82><0x90>₈: < 20 s
• Reference Operating Conditions:
  • Temperature: 25 °C (77 °F)
  • Pressure: 1013 hPa (15 psi)
• Maximum Measured Error: ±1 % or ±8 µg/l (ppb) of the measured value (higher value applies).
• Limit of Detection (LOD): 4 ppb
• Limit of Quantification (LOQ): 10 ppb
• Repeatability: 2 ppb

Installation

Mounting Instructions

Must be installed in a suitable assembly. Do not install the sensor freely suspended from the cable.

Orientation

• c-shaped spot cap: Can be installed at any angle (0 to 360°). Self-draining in recommended angles.
• u-shaped spot cap: Must be installed at an inclination of 0 to 180° in an assembly. Recommended angles are 0 to 45° or 135 to 180° to prevent air bubble attachment. Angles of 45 to 135° may cause increased measured values due to air bubbles. Installation upside down is not permitted.

Installation Examples

• Permanent installation: Unifit CPA842 assembly.
• Flow assembly: CYA680 in various nominal diameters and materials, suitable for horizontal or vertical pipes.
• Flow assembly: Flowfit CYA21 for water treatment and processes, with low sampling volume.
• Retractable assembly: Cleanfit CPA875 or CPA450 for vessels and pipes.

Environment

• Ambient Temperature Range: –5 to +100 °C (23 to 212 °F)
• Storage Temperature Range: -25 to 50 °C (-13 to 122 °F) at 95% relative air humidity, non-condensing.
• Degree of Protection: IP68, IP69

Process

• Process Temperature Range:
  • Sensor Shaft (EPDM): -10 to +140 °C (15 to 280 °F)
  • Sensor Shaft (FFKM): 0 to +140 °C (32 to 280 °F)
  • c-shaped spot cap: 0 to 60 °C (32 to 140 °F)
  • u-shaped spot cap: 0 to 80 °C (32 to 175 °F)
• Process Pressure Range: 0.02 to 13 bar (0 to 190 psi) abs.
• Chemical Resistance: Not suitable for halogen-containing solvents, ketones, and toluene.
• CIP Compatibility: Yes
• Autoclavability: Yes, max. 140 °C (284 °F)

Mechanical Construction

• Design: Spot cap available in c-shaped or u-shaped designs.
• Dimensions: Standard sensor length options are 120 / 160 / 220 / 320 / 420 mm.
• Weight: Approximately 0.1 kg (0.20 lbs) for a 120 mm length version.
• Materials (Parts in contact with medium):
  • Sensor shaft: Stainless steel 1.4435 (AISI 316L)
  • Process seal: FKM (USP <87>, <88> Class VI and FDA compliant)
  • Seals/O-rings: EPDM, FFKM (USP <87>, <88> Class VI and FDA compliant)
  • Spot cap: Stainless steel 1.4435 (AISI 316L), titanium, or Hastelloy
  • Spot layer: Silicone (USP <87>, <88> Class VI and FDA compliant)
• Process Connection: Pg 13.5 (Torque max. 3 Nm)
• Surface Roughness: Ra < 0.38 µm
• Temperature Sensor: Pt1000 (Class A according to DIN IEC 60751)

Certificates and Approvals

• CE Mark: Confirms compliance with EU directives.
• Ex Approvals: ATEX, IECEx, NEPSI, INMETRO, JPN, CSA C/US, listed for various gas and dust hazardous area classifications.
• Hygienic Compatibility: Complies with Regulation (EC) No. 1935/2004. EHEDG certified (Type EL-Class I).
• Pharmaceutical Compatibility: Produced according to ASME BPE, complies with cGMP requirements. Biological reactivity tests USP 87, USP 88 Class VI, FDA material conformity, TSE-/BSE-free.
• Additional Certification: Inspection certificate EN 10204 3.1 available depending on version.
• Other Standards: EAC certified, CRN registered.
• Test Reports: Manufacturer's certificate with individual final test data, Surface roughness test.

Ordering Information

• Product details and configuration available via the product page and configurator on www.endress.com.

Scope of Delivery

• 1 x Sensor (version as ordered)
• 1 x Brief Operating Instructions
• Safety instructions for hazardous areas (if applicable)
• Supplement for ordered certificates (if applicable)

Accessories

Device-specific accessories include various assemblies (Cleanfit CPA875, Flowfit CPA240, Unifit CPA842, Cleanfit CPA450, Flowfit CYA21, CYA680), measuring cables (CYK10, CYK11, CYK20), zero-point gel (COY8), and transmitters (Liquiline CM44, CM42, CML18, CM82, CM72), Memosens analog converter (CYM17), and software (Memobase Plus CYZ71D).

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