Current Loop Pressure Controllers
Description
Current Loop Pressure Controllers are devices designed to regulate pressure within a system by maintaining a setpoint pressure. They receive inputs from pressure sensors and output control signals to adjust the pressure accordingly. These controllers are integral in ensuring that the pressure within a system remains stable and within desired limits.
Working Principle
Current Loop Pressure Controllers operate on a closed-loop system, where they continuously monitor the pressure via feedback loops. The controller adjusts the pressure by opening or closing a valve based on the difference between the actual pressure and the setpoint. This adjustment is achieved through a two-wire loop system, which supplies both power and signal on the same lines. The controller uses various control strategies, such as PID (Proportional, Integral, Derivative) control, to maintain the desired pressure level. This makes them useful in applications where precise pressure control is critical, as they can automatically adjust to maintain stability.
Applications
Current Loop Pressure Controllers are widely used in industrial processes where precise pressure control is necessary. For example, they are employed in chemical processing plants to maintain the pressure of gases like oxygen and nitrogen. They are also used in the pharmaceutical industry to ensure the correct pressure in reactors and in the food and beverage industry to control carbonation levels in beverages.
Advantages over other Pressure Controllers
One significant advantage of Current Loop Pressure Controllers is their ability to use a two-wire loop system, which simplifies wiring and reduces installation costs. They also offer better security and less noise compared to analog systems, as well as lower energy costs and increased flexibility in device pairing. Additionally, digital pressure controllers provide simple calibration and tuning procedures, which can be more efficient than traditional analog systems.
Limitations
Current Loop Pressure Controllers can have limitations such as susceptibility to noise in the signal, which can affect accuracy. They may also require more complex setup and calibration compared to simpler mechanical pressure regulators. Additionally, the initial cost of digital controllers can be higher than analog ones, although this may be offset by lower operating expenses over time.
Considerations
When selecting a Current Loop Pressure Controller, it is important to consider factors such as initial costs, which can be higher for digital systems. Operating expenses may be lower due to reduced energy consumption and maintenance needs. Durability and accuracy are crucial, as these devices must withstand industrial environments and provide precise control. Replacement and maintenance costs should also be evaluated, as well as the ease of calibration and tuning to ensure long-term reliability and performance.
from Clippard
Precise, linear digital pressure control within a closed-loop system with ultra high resolution and repeatability. The Cordis is a revolutionary microcontroller primed for escape velocity from a proportional control market that has grown stagnant. Built with the highest quality Clippard EVP and DVP... [See More]
- Control Signal: Analog Voltage Output; Current Loop Output; Serial / Digital
- Form Factor: Chassis
- Control: Linear
- Accuracy: 0.2
from Clippard
Clippard CPS series pressure sensors are conditioned and offer a customized calibration around your application requirements, allowing for a full scale accuracy of 0.25% over the calibrated range. They can be used in conjunction with Clippard's Cordis Pressure Controller or as a standalone... [See More]
- Control Signal: Analog Voltage Output; Current Loop Output; Serial / Digital
- Form Factor: Chassis
- Control: Linear
- Accuracy: 0.2
from Bronkhorst USA
EL-PRESS Metal Sealed Pressure Meters / Controllers. Metal Seal Pressure Meters and Controllers of Bronkhorst High-Tech are characterized by their unique, patented metal-to-metal seal construction with excellent resealing capability. Furthermore they distinguish themselves by a high surface quality... [See More]
- Control Signal: Analog Voltage Output; Current Loop Output; Serial / Digital; Network / Fieldbus Output (optional feature)
- Features: PC-Based
- Control: Linear
- Interface: Computer Programmable (optional feature)
from Florite International, Inc.
The 900 Series is an economic one loop microcomputer-based instrument incorporating user selectable digital and analog inputs, as well as analog and relay outputs. Other 900 Series features include .005% high accuracy PID, batch, and dose control functions. Additionally, the 900 Series encompasses... [See More]
- Control Signal: Analog Voltage Output; Current Loop Output; Switched Output; Serial / Digital; Network / Fieldbus Output; Screw Terminal
- Control: Limit; Linear; Feedforward; PID
- Controller Type: Laboratory
- Features: PLC; Multi-Function; Datalogger; Is a Chart Recorder; Rate Indication/ Control; Totalizing (Length or Roll Diameter) Indication/ Control
from Gefran
Single-loop microprocessor controller, 96 x 96 (1/4 DIN) format, appropriate for processes with high variation speed. Thanks to its extended functions and configurable hardware and software, it provides high applicative flexibility in systems that control and monitor pressure, force, temperature,... [See More]
- Control Signal: Analog Voltage Output; Current Loop Output; Switched Output
- Control: Limit; PID
- Controller Type: Ratio Controller
- Form Factor: DIN
from DME Company
Compact and self contained. Provides Digital Display Readout of Cavity Pressure. Provides Amplified Output of Scaled Cavity Pressure Signal when setup correctly with Pin Dia. ( 0-5Vdc Output = 0 to 20,000 PSI ). User Selectable Analog Amplified Output: Default 0-5Vdc, user dip switch selectable... [See More]
- Control Signal: Analog Voltage Output (optional feature); Current Loop Output
- Control: Limit
- Controller Type: Hydraulic Controller
- Features: Is a Chart Recorder (optional feature); Rate Indication/ Control
from Brooks Instrument
Whether it ’s dust, moisture, temperature extremes or wash-down requirements, the SLAMf Series elastomer sealed pressure controllers deliver the precise accuracy and long-term stability of our proven SLA5800 family of thermal mass flow meters and controllers. A specially engineered NEMA4X/IP66... [See More]
- Control Signal: Analog Voltage Output; Current Loop Output; Serial / Digital; Network / Fieldbus Output; Other; RS485, DeviceNet™, Profibus®
- Inputs: 1
- Interface: Computer Programmable; Network
- Control Outputs: 1
from Dynisco
Features and Benefits. Auto-tuning control in a discrete 1/4 DIN package. Graphical/text LCD Display with color change LED backlight on alarm (red/green). Graphical trend view of process, alarms & events as standard. Easy to use Setup Wizard. Single loop control. Display and control of... [See More]
- Control Signal: Analog Voltage Output; Current Loop Output
- Features: Rate Indication/ Control
- Control: Limit; Linear
- Form Factor: Chassis
from Bronkhorst USA
EL-PRESS Digital Electronic Pressure Meters / Controllers. The EL-PRESS series digital electronic pressure transducers and controllers for gases and liquids have a well-proven compact thru-flow design. The instruments include a diaphragm type piezo-resistive pressure sensor for pressure... [See More]
- Control Signal: Analog Voltage Output; Current Loop Output; Serial / Digital; Network / Fieldbus Output (optional feature)
- Features: PC-Based
- Control: Limit
- Interface: Computer Programmable (optional feature)
from Florite International, Inc.
The Florite Model 990X is an innovative, technically superior, high quality and reliable microcomputer-based controller suitable for any commercial or industrial application. The instruments user configurable screw-terminal channels enable any mix of up to eight inputs and or outputs regardless of... [See More]
- Control Signal: Analog Voltage Output; Current Loop Output; Switched Output; Serial / Digital; Network / Fieldbus Output; Screw Terminal, DA15
- Control: Limit; Linear; Feedforward; PID
- Controller Type: Laboratory
- Features: PLC; Multi-Function; Datalogger; Is a Chart Recorder; Rate Indication/ Control; Totalizing (Length or Roll Diameter) Indication/ Control