Limit / Set Point Control Pressure Controllers
Description
Limit / Set Point Control Pressure Controllers are devices designed to regulate pressure by setting specific thresholds or limits. When the pressure in a system exceeds or falls below these predetermined set points, the controller takes action to maintain the desired pressure level. This ensures that the system operates within safe and efficient parameters.
Working Principle
Limit / Set Point Control Pressure Controllers operate by receiving inputs from pressure sensors and comparing these inputs to the set points. If the pressure deviates from the set point, the controller sends a signal to adjust the pressure accordingly. This closed-loop system is crucial for maintaining stability and preventing damage to equipment or hazards to personnel. The controllers are useful because they provide precise control over pressure, ensuring that systems function optimally and safely.
Applications
These controllers are widely used in various industries where maintaining specific pressure levels is critical. For example, in chemical processing plants, they ensure that reactors operate under safe pressure conditions. In HVAC systems, they help maintain the desired environmental conditions by controlling the pressure of refrigerants. Additionally, they are used in laboratory settings to control the pressure in experimental setups, ensuring accurate and repeatable results.
Advantages over other Pressure Controllers
Limit / Set Point Control Pressure Controllers offer several advantages over other types of pressure controllers. They provide precise control by allowing users to set specific pressure limits, which can prevent system overloads and failures. Unlike simple pressure regulators, these controllers can respond dynamically to changes in system conditions, offering better protection and efficiency. Their ability to integrate with advanced control strategies, such as PID control, enhances their responsiveness and accuracy.
Limitations
One limitation of Limit / Set Point Control Pressure Controllers is their complexity in setup and tuning, especially when integrating with advanced control strategies like PID. They may also be sensitive to noise in the system, which can affect their performance. Additionally, these controllers might not be suitable for highly nonlinear systems where pressure conditions change unpredictably.
Considerations
When selecting Limit / Set Point Control Pressure Controllers, several factors should be considered. Initial costs can vary depending on the complexity and features of the controller. Operating expenses may include maintenance and calibration to ensure accuracy and reliability. Durability is an important factor, as controllers need to withstand the operational environment. Accuracy is critical, especially in applications where precise pressure control is necessary. Replacement and maintenance costs should also be evaluated, as these can impact the long-term cost-effectiveness of the controller.
from Cincinnati Sub-Zero Products
Save Valuable Programming Time with CSZ's Next Generation Controller. CSZ ’S new EZT-570S touch screen controller is designed with an improved interface and added functionality for ease of use. The controller, which utilizes smart-phone technology, allows users to choose to navigate their... [See More]
- Control: Limit; PID; Fuzzy Logic
- Features: Datalogger; Is a Chart Recorder
- Controller Type: Environmental; Laboratory
- Form Factor: Stand-Alone
from Terra Universal, Inc.
Automatically controls pump operation to maintain stable vacuum levels inside a vacuum chamber. Includes easy-to-read digital vacuum gauge and piezo-resistive pressure sensor for outstanding accuracy, stability and repeatability. Enhances pump life and efficiency [See More]
- Control: Limit
- Form Factor: Stand-Alone
- Controller Type: Environmental
- Interface: Switches
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: Limit; PID
- Form Factor: DIN
- Controller Type: Ratio Controller
- Interface: Digital Front Panel; Network
from Barksdale Control Products
Barksdale's UAS3 Electronic Trip Amplifier and controller is the perfect companion to any sensing device that provides a 4-20 mA or 0-10 VDC analog output. Our UAS3 offers the unique ability to switch four discrete circuits in a single, compact unit. In addition to its four SPDT relays, the UAS3... [See More]
- Control: Limit
- Inputs: 1
- Interface: Digital Front Panel
- Type: DC Voltage Inputs (optional feature); Current Loop (Transmitter) Excitation (optional feature); Resistive/ Potentiometer Inputs (optional feature)
from Time Mark Corporation
The Model 661 Alarm Control, part of the 600 series line of instrumentation controls, is designed to monitor and maintain measurable applications such as liquid levels, temperature, pressure, flow, etc. A user-provided 4-20mA current loop represents the measurable application, and output connections... [See More]
- Control: Limit
- Type: Current Loop (Transmitter) Excitation
- Features: Rate Indication/ Control
- Control Signal: Switched Output
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: Limit; Linear
- Form Factor: Chassis
- Features: Rate Indication/ Control
- Interface: Digital Front Panel
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: Limit
- Features: Is a Chart Recorder (optional feature); Rate Indication/ Control
- Controller Type: Hydraulic Controller
- Form Factor: Stand-Alone
from Nor-Cal Products, Inc. - The Vacuum Experts
IntellisysTM adaptive pressure controllers come in many different package sizes and with a variety of options to fit every application. A unique controller series exists for every valve type. For bench-top or laboratory use consider the touch screen LCD front panel version. [See More]
- Control: Limit; PID
- Type: DC Voltage Inputs
- Interface: Network
- Control Signal: Analog Voltage Output; Serial / Digital; Network / Fieldbus Output; Other; TTL
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: Limit
- Interface: Computer Programmable (optional feature)
- Features: PC-Based
- Inputs: 1
from Ziehl-Abegg Inc.
For simple manual speed regulation 5-step transformer-based controllers for single-phase and three-phase fans are available. We supply the corresponding switchgear for multi-speed motors. Motor protection devices are available for thermal monitoring based on thermostats or thermistors (PTC). [See More]
- Control: Limit
- Form Factor: Stand-Alone
- Controller Type: Airflow Velocity Controller
- Interface: Switches
from PMC Engineering LLC
The DPM is a multipurpose, easy to use digital dual-input process meter ideal for level, flow rate, temperature transmitter, or pressure transmitter applications. Various math functions may be applied to the inputs including addition, difference, absolute difference, average, weighted average,... [See More]
- Control: Limit
- Form Factor: Chassis
- Features: Multi-Function; Datalogger; Rate Indication/ Control; Totalizing (Length or Roll Diameter) Indication/ Control
- Interface: Digital Front Panel
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: Limit; Linear; Feedforward; PID
- Features: PLC; Multi-Function; Datalogger; Is a Chart Recorder; Rate Indication/ Control; Totalizing (Length or Roll Diameter) Indication/ Control
- Controller Type: Laboratory
- Form Factor: Board (optional feature); Chassis; Rack; Stand-Alone; Wall Mount
from ALMiG USA Corporation
Features: Very easy toperate. Microprocessor control unit ALMIG AIR CONTROL f. Soft start through frequency transformer. Avoidance of current peaks during start-up. All electric connections tagged (name plates) for easy maintenance. Customer passwords for best system security against misuse. Display... [See More]
- Control: Limit
- Features: Multi-Function; Rate Indication/ Control
- Controller Type: Compressor Controller
- Form Factor: Chassis
from Gefran
Displays pressure in a 5-digit LED display. Auto zero. Auto span. Auto calibration. 4 alarms with adjustable setpoint. Touch-type keypad. Built-in strain gage bridge excitation. Filter for digit stabilization. Coded access for user lockout. Transducer. Better than ±0.50% accuracy. [See More]
- Control: Limit
- Interface: Digital Front Panel
- Form Factor: DIN
- Standards and Compliance: RoHS
from DME Company
Hydraulic (oil) valve gate controls provide reliable, accurate and effective control. Solid-state timers and relays have a life rating of 10 million cycles. User-friendly auto-reset function. Individual test buttons for each zone provide precise time control to .01 second. Compact design takes up... [See More]
- Control: Limit
- Form Factor: Stand-Alone
- Features: Rate Indication/ Control
- Interface: Switches; Digital Front Panel (optional feature)
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: Limit
- Interface: Computer Programmable (optional feature)
- Features: PC-Based
- Inputs: 1
from PMC Engineering LLC
The PM is a multipurpose, easy to use digital process meter ideal for level, flow rate, temperature, or pressure transmitter applications. It accepts current and voltage signals. Three of the front panel buttons can be custom programmed for a specific operation. Dual Scale for Level Applications -... [See More]
- Control: Limit
- Form Factor: Chassis
- Features: Multi-Function; Datalogger; Rate Indication/ Control; Totalizing (Length or Roll Diameter) Indication/ Control
- Interface: Digital Front Panel
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: Limit; Linear; Feedforward; PID
- Features: PLC; Multi-Function; Datalogger; Is a Chart Recorder; Rate Indication/ Control; Totalizing (Length or Roll Diameter) Indication/ Control
- Controller Type: Laboratory
- Form Factor: Chassis; Rack; Stand-Alone; Table Top Mount
from ALMiG USA Corporation
Features: State of the art microprocessor operated. Very simple operator control. Parameter entry is protected by a code. Self-test of the compressor before every start-up for. Continuous monitoring of all parameters relevant to operation. Star-delta contactors, control voltage transformer,... [See More]
- Control: Limit
- Features: Multi-Function; Rate Indication/ Control
- Controller Type: Compressor Controller
- Form Factor: Chassis