CleanFit CPA871

Summary

Product Identification

• Product Name: Cleanfit CPA871
• Product Type: Flexible retractable process assembly
• Intended Use: For standard 12 mm sensors for pH and redox measurements.

Application Areas

The Cleanfit CPA871 is designed for demanding applications including:

• Water and wastewater (including seawater)
• Chemical industry
• Oil and gas
• Electricity and energy
• Hazardous areas
• Primaries and metals

Key Features and Benefits

• Operational Safety: Intelligent functions prevent insertion/retraction without a sensor or unintentional movement from the measuring position.
• Demanding Applications: An optional immersion chamber is available to mitigate buildup issues.
• Robust Design: Features a metallic support housing for mechanical stability.
• Process Adaptability: Offers a wide range of process connections and materials in contact with the medium, suitable for corrosive media and hazardous areas.
• Process Interruption-Free Maintenance: Allows for sensor removal, cleaning, sterilization, or calibration without stopping the process.
• Modular Design: Can be flexibly adapted to various applications.
• Drive Options: Available with manual or pneumatic drives.
• Chamber Options: Standard or immersion chamber versions.
• Safety Functions:
  • Locking mechanism prevents movement from service position if the sensor is not installed.
  • Limit position locking ensures the assembly remains in its selected position (manual or pneumatic) even with compressed air failure (pneumatic drive).
  • Protection cap prevents sensor removal in the measuring position.
  • Non-rotating sensor guide ensures consistent sensor positioning.

Operating Limits

Process Temperature Range

• For all materials except PVDF, PVDF conductive and PP: -10 to 140 °C (14 to 284 °F)
• PVDF and PVDF conductive: -10 to 100/90 °C (14 to 212/194 °F)
• PP (polypropylene): 0 to 60 °C (32 to 140 °F)

Process Pressure Range

• Pneumatic drive: 16 bar (232 psi) up to 140 °C (284 °F)
• Manual drive: 8 bar (116 psi) up to 140 °C (284 °F)
  • (PP version may vary)

Pressure-Temperature Ratings

Pressure-temperature ratings vary by material and drive type. See the official PDF for exact tabulated values and detailed graphs for:

• PP (basic version)
• 1.4404, Alloy C22, PEEK (basic and immersion chamber versions)
• PVDF and PVDF conductive (basic and immersion chamber versions)

Note: Insertion/retraction at pressure requires reduced pressure ratings (up to 6 bar for manual/pneumatic, up to 8 bar for pneumatic). Higher pressures are limited to static operation with insertion/retraction not permitted.

Mechanical / Hydraulic

• Stroke Options:
  • 36 mm for standard and immersion chamber versions
  • 78 mm for standard version
• Rinse Chamber Volume:
  • Single chamber: 12.02 cm³ (0.73 in³) max. / 2.81 cm³ (0.17 in³) min.
  • Immersion chamber, short: 15.75 cm³ (0.96 in³) max. / 6.73 cm³ (0.41 in³) min.
  • Immersion chamber, long: 17.14 cm³ (1.05 in³) max. / 8.12 cm³ (0.5 in³) min.
• Weight:
  • Pneumatic drive: 3.8 to 6 kg (8.4 to 13.2 lbs)
  • Manual drive: 3 to 4.5 kg (6.6 to 9.9 lbs)
• Materials:
  • In contact with medium:
    • Seals: EPDM / FKM / FFKM
    • Immersion tube, process connection, service chamber: Stainless steel 1.4404 (AISI 316L) Ra < 0.76 / PEEK / Alloy C22 Ra < 0.76 / PVDF / PVDF conductive / PP
    • Rinse connections: Stainless steel 1.4404 (AISI 316L) or Alloy C22
  • Not in contact with medium:
    • Manual drive: Stainless steel 1.4301 (AISI 304) or 1.4404 (AISI 316L), plastics PPS CF15, PBT, PP
    • Pneumatic drive: Stainless steel 1.4301 (AISI 304) or 1.4404 (AISI 316L), plastics PBT, PP

Electrical

• Limit Position Switches:
  • Switching element function: NAMUR NC contact (inductive)
  • Switching distance: 1.5 mm (0.06 ")
  • Nominal voltage: 8 V
  • Switching frequency: 0 to 5000 Hz
  • Housing material: Stainless steel
  • Output interface terminals: NAMUR

Mounting and Dimensions

• Sensor Length Compatibility: Various sensor lengths (120 mm, 225 mm, 360 mm) are supported depending on the assembly version (short, long, immersion chamber).
• Mounting Distance for Sensor Replacement: A free path length (XA) is required above the drive for sensor replacement:
  • 280 mm (11.02") for 120 mm sensors
  • 408 mm (15.94") for 225 mm sensors
  • 360 mm (14.17") for 225 mm sensors (long version)
  • 570 mm (22.44") for 360 mm sensors (immersion chamber, long version)
• Process Connections: Various types are available including Clamp, Flange (EN1092-1, ASME B16.5, JIS B2220), Dairy fitting, and Thread (NPT, ISO 228).
• Dimensions: Detailed dimensions for pneumatic and manual drives in short, long, and immersion chamber versions are provided in the official PDF.

Accessories

• Cleanfit Control CYC25: Converts electrical signals to pneumatic signals for controlling retractable assemblies or pumps, enabling automatic sensor cleaning.
• Air-Trol 500: Control unit for manual operation of pneumatically-controlled retractable assemblies.
• Weld-in adapters: Available in straight and angled versions.
• Dummy plugs and sensor dummies: For maintenance.
• Seal kits: For various wetted parts and seal materials (EPDM, FKM, FFKM).
• Cables and connectors: For limit switches.
• Installation material: Water filter, pressure reducer, and hose connection sets.

Sensors

The CPA871 is compatible with a range of Endress+Hauser sensors for pH, ORP, conductivity, oxygen, and absorption measurements. Specific sensor models and their technical information are detailed in the official PDF, including:

• pH Sensors: Memosens CPS11E, Orbisint CPS11D/CPS11, Memosens CPS31E, Memosens CPS41E, Ceraliquid CPS41D/CPS41, Memosens CPS61E, Memosens CPS71E, Ceragel CPS71D/CPS71, Memosens CPS91E, Orbipore CPS91D/CPS91.
• ORP Sensors: Memosens CPS12E, Orbisint CPS12D/CPS12, Memosens CPS42E, Ceraliquid CPS42D/CPS42, Memosens CPS72E, Ceragel CPS72D/CPS72.
• ISFET pH Sensors: Memosens CPS47D, Memosens CPS77D.
• Combined pH/ORP Sensors: Memosens CPS16E, Memosens CPS16D, Memosens CPS76E, Memosens CPS76D, Memosens CPS96E, Memosens CPS96D.
• Conductivity Sensors: Memosens CLS82E, Memosens CLS82D.
• Oxygen Sensors: Oxymax COS22E, Oxymax COS22D/COS22.
• Absorption Sensors: OUSBT66.

---

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