Description
Overview
The ControlAir Type 2000 CA2020/CA2021 is an explosion-proof electro-pneumatic valve positioner designed to provide accurate and responsive positioning of rotary and linear control valves. The positioner accepts a standard 4-20 mA electrical control signal and converts it into the pneumatic output required to position the valve actuator.
Designed for demanding industrial process applications, the CA2020/CA2021 combines electro-pneumatic control with rugged construction for reliable valve positioning in hazardous environments. Its closed-loop positioning design continuously compares the input command with actual valve position and adjusts pneumatic output as required to maintain the commanded position.
The CA2020/CA2021 is well suited for process control systems requiring dependable valve positioning, repeatable response, and compatibility with standard industrial 4-20 mA control signals. Its explosion-proof design makes it particularly suitable for applications where electrical equipment must meet hazardous-location requirements. :contentReference[oaicite:0]{index=0}
Key Features
- Explosion-proof electro-pneumatic valve positioner
- 4-20 mA electrical input signal
- Accurate valve positioning and control
- Suitable for rotary and linear valve applications
- Closed-loop positioning for stable valve response
- Converts electrical control signals into pneumatic actuator output
- Designed for demanding industrial process applications
- Rugged construction for reliable operation
- Suitable for hazardous-location applications
- Designed for integration with standard process control systems
Performance Characteristics
The Type 2000 CA2020/CA2021 operates as an electro-pneumatic positioning device, using a 4-20 mA electrical command signal to control pneumatic output to the valve actuator. Mechanical position feedback allows the positioner to compare actual valve position with the commanded position and continuously adjust pneumatic output until the desired position is achieved.
This closed-loop operating principle helps provide accurate, repeatable valve positioning as process conditions and actuator requirements change. The design is suitable for both rotary and linear valve assemblies, allowing the CA2020/CA2021 to be applied across a broad range of process-control applications. :contentReference[oaicite:1]{index=1}
How to Select the Right Configuration
Selecting the correct Type 2000 CA2020/CA2021 configuration depends on the valve and actuator design, required hazardous-location approval, available pneumatic supply, and installation requirements.
- Confirm that the control system provides the required 4-20 mA electrical input signal
- Determine whether the application uses a rotary or linear valve actuator
- Verify actuator travel or rotation requirements before selecting the positioner configuration
- Confirm that available instrument-air supply meets the positioner’s pneumatic requirements
- Verify the hazardous-area classification and required approvals for the installation
- Confirm the required actuator action and valve fail position
- Review mounting and linkage requirements for the specific valve and actuator assembly
Correct positioner selection and setup are important for achieving stable valve response. The positioner should be matched to the actuator and calibrated according to the required valve travel and control signal.
For additional guidance:
Applications
The Type 2000 CA2020/CA2021 is designed for industrial process applications requiring accurate electro-pneumatic positioning of control valves, particularly where explosion-proof electrical construction is required.
- Process control valves
- Rotary control valves
- Linear control valves
- Pneumatic valve actuators
- Industrial process control systems
- Flow control applications
- Pressure control applications
- Temperature control applications
- Level control applications
- Chemical processing equipment
- Oil and gas process equipment
- Industrial automation systems
- Hazardous-location valve control
Models & Configurations
CA2020
The CA2020 is part of the Type 2000 explosion-proof electro-pneumatic valve positioner family and is designed for use with a standard 4-20 mA control signal.
CA2021
The CA2021 is part of the same Type 2000 explosion-proof electro-pneumatic valve positioner family, providing an additional configuration for matching the positioner to the valve and actuator installation.
Because the source material available here does not clearly establish the configuration differences between CA2020 and CA2021, I would not add unsupported differences or ordering details to the website. Those should be populated directly from the current CA2020/CA2021 ordering table or specification sheet once confirmed.
Technical Resources
FAQs
What is the Type 2000 CA2020/CA2021 used for?
The Type 2000 CA2020/CA2021 is an explosion-proof electro-pneumatic valve positioner used to accurately position pneumatic control valves in response to a 4-20 mA electrical control signal.
What input signal does the CA2020/CA2021 use?
The CA2020/CA2021 accepts a standard 4-20 mA electrical control signal for integration with industrial process control systems.
Can the CA2020/CA2021 be used with rotary and linear valves?
Yes. The CA2020/CA2021 is designed for valve positioning applications involving rotary and linear valve assemblies.
How does the CA2020/CA2021 control valve position?
The positioner compares the electrical command signal with mechanical feedback from the valve position and adjusts pneumatic output to the actuator until the commanded valve position is achieved.
Is the CA2020/CA2021 explosion-proof?
Yes. The CA2020/CA2021 is an explosion-proof electro-pneumatic valve positioner designed for industrial applications requiring appropriate hazardous-location electrical protection.
What types of applications use the CA2020/CA2021?
Typical applications include process control valves, rotary and linear valve actuators, flow control, pressure control, temperature control, level control, industrial automation, and valve positioning in hazardous locations.
