Retractable Assembly for Difficult Process Media
The Cleanfit CPA473 is designed for process applications where pH or ORP sensors are exposed to sticky, fibrous or difficult-to-handle media. Its retractable design allows the sensor to be moved between the measuring and service positions without requiring the process to be shut down.
This makes the assembly particularly useful where regular sensor maintenance is required but draining the tank or stopping production would be impractical.
Integrated Scraper for Sticky and Fibrous Media
A key feature of the CPA473 is its integrated scraper and sleeve sealing arrangement. The scraper helps reduce the accumulation of sticky or fibrous process material around the sensor during operation.
This design is particularly relevant to applications such as pulp and paper processing, wastewater treatment and other processes where conventional sensor assemblies can be affected by buildup.
Ball Valve for Process Separation
The CPA473 uses a ball valve to separate the sensor assembly from the process. This provides an additional level of process protection when the sensor is retracted for cleaning, inspection or replacement.
The assembly is designed for installation in tanks and pipes, with Endress+Hauser specifying piping applications from DN80.
Manual or Pneumatic Operation
The CPA473 is available with manual or pneumatic operation, allowing the assembly to be matched to different plant operating requirements.
It can also be fully automated with compatible Endress+Hauser control systems such as CPC30 / CPC300, enabling automated sensor cleaning and calibration where the installation requires it.
Sensor Maintenance Without Process Shutdown
One of the practical advantages of the CPA473 is that the sensor can be replaced or serviced while the process is running. This can reduce maintenance-related downtime in continuous industrial processes.
With an appropriate automated control system, cleaning and calibration procedures can also be integrated into the overall measurement system.
Compact Immersion Design
The CPA473 provides an immersion depth of approximately 61 to 235 mm, depending on the selected configuration. This allows the assembly to accommodate different installation arrangements while maintaining a compact retractable design.
Stainless Steel Construction for Industrial Applications
The electrode holder is made from stainless steel 1.4404, while the ball valve uses stainless steel and PTFE components. Seal materials include EPDM, FPM and perfluoroelastomer, depending on configuration.
These material options allow the assembly to be selected according to the process medium and operating conditions.
Flexible Process Connections
The CPA473 can be configured with several process connections, including G1¼ internal thread, DN50, DN65 and ANSI 2" options. The integrated rinse chamber can also be configured with G1/4" or NPT 1/4" connections.
Designed for Chemical and Process Industries
Endress+Hauser lists the CPA473 for chemical industry, paper industry, wastewater and industrial water, power plants, refuse incinerators and sugar industry applications.
Its combination of retractable installation, ball-valve isolation and scraper protection makes it suitable for process measurement environments where sensor accessibility and resistance to buildup are important.
Key Features
- Retractable assembly for pH and ORP sensors
- Designed for sticky and fibrous process media
- Integrated scraper and sleeve sealing system
- Ball valve for reliable process separation
- Manual or pneumatic operation
- Compatible with automated cleaning and calibration systems
- Sensor replacement without process interruption
- Immersion depth 61 to 235 mm
- PA pressure cylinder up to 80°C / 6 bar
- Stainless steel pressure cylinder up to 100°C / 10 bar
- Stainless steel 1.4404 electrode holder
- EPDM, FPM or perfluoroelastomer seal options
- G1¼ internal thread, DN50, DN65 and ANSI 2" process connections
- Integrated rinse chamber
- Suitable for tanks and piping from DN80
- Designed for chemical, paper, wastewater and other industrial applications
Typical Applications
Chemical Processing
The CPA473 can be used for pH and ORP measurement in chemical processes where aggressive or sticky media require a retractable sensor installation with reliable process isolation.
Pulp and Paper
Fibrous process media can cause material buildup around measurement sensors. The integrated scraper and sleeve sealing design of the CPA473 is intended to address these conditions.
Wastewater and Industrial Water
The retractable design allows sensors to be accessed for maintenance without requiring the complete process to be stopped, making the CPA473 suitable for demanding water and wastewater applications.
Power Plants
The CPA473 can be installed in process measurement points within power generation facilities where pH or ORP monitoring and regular sensor maintenance are required.
Refuse Incineration
The assembly is also listed for use in refuse incineration applications where reliable access to process sensors can be important for ongoing measurement and maintenance.
Sugar Processing
Endress+Hauser lists the sugar industry among the application areas for the CPA473, particularly where process media and sensor buildup make conventional sensor installation more difficult.
FAQ
What is the Endress+Hauser Cleanfit CPA473?
The CPA473 is a retractable process assembly for pH and ORP sensors. It provides a protected installation point for the sensor and allows the sensor to be retracted for maintenance while the process remains in operation.
What type of sensors can be installed in the CPA473?
The CPA473 is designed for pH and ORP / redox sensors using the specified sensor connection arrangement. Endress+Hauser lists a PG13.5 sensor connection for the assembly.
What makes the CPA473 suitable for sticky media?
The assembly incorporates an integrated scraper and sleeve sealing system designed to help prevent sticky or fibrous process material from accumulating around the sensor.
Can the sensor be replaced while the process is running?
Yes. The retractable design allows the sensor to be removed from the process position while the process continues, provided the assembly is operated according to the applicable installation and safety requirements.
Is the CPA473 manually or pneumatically operated?
The CPA473 is available with manual or pneumatic operation. It can also be integrated with Endress+Hauser control systems for automated operation.
What is the maximum process temperature?
For the PA pressure cylinder, the maximum process temperature is 80°C. With the stainless steel pressure cylinder, the specified temperature is up to 100°C, with continuous operation up to 6 bar.
What is the maximum process pressure?
The PA pressure cylinder is rated up to 6 bar, while the stainless steel pressure cylinder is rated up to 10 bar. Actual permissible temperature and pressure combinations depend on the selected configuration.
What is the immersion depth of the CPA473?
The specified immersion depth is 61 to 235 mm, depending on the selected assembly configuration.
What process connections are available?
Endress+Hauser lists G1¼ internal thread, DN50, DN65 and ANSI 2" process connection options.
Which industries use the CPA473?
Typical applications listed by Endress+Hauser include chemical processing, paper production, wastewater and industrial water, power plants, refuse incineration and sugar processing.
