Controllers
Centro carries a complete selection of controllers available to purchase online. This includes Process Meters, Panel Meters, and PID controllers. Process Meters measure and control process variables such as tempera...
Categories in Controllers - Advanced Automation Control Systems (2)
Panel Meters and Displays
Panel meters and displays are instruments used to monitor and display various electrical or process parameters. They provide real-time measurement and visualization of parameters such as voltage, current, temperature, pressure, or flow rate. Panel meters and displays are available in different types, including analog meters, digital displays, or graphical interfaces, offering versatile options for different applications. They find extensive use in industrial control panels, machinery, electrical distribution systems, and monitoring stations, providing operators with crucial information for process control and troubleshooting.
PID
PID, which stands for Proportional-Integral-Derivative, refers to a control algorithm widely used in industrial automation and process control systems. PID controllers continuously analyze and adjust a system's control output based on feedback from sensors. They aim to minimize the error between the desired setpoint and the measured process variable by dynamically adjusting proportional, integral, and derivative terms. PID controllers are essential for maintaining stability, accuracy, and responsiveness in applications such as temperature control, pressure regulation, or speed control.
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The Dwyer - CN7233 is a Ramp & Soak Controller featuring T/C, RTD, Analog V/I, 1 I/P, Relay/Relay, 2 O/P, 1/4 DIN, AC, 3.5 Digit Dual, 2x Alarm Outputs, Multiple Ramp & Soak, Serial, and CN7200. Sold individually.
$255.27
Should ship between 15 Jan and 22 Jan
Subject to factory lead times
The Dwyer - CN32PT-220 is a Temperature featuring Process & Strain Controller, T/C, RTD, Thermistor, Analog V/I, Strain, 1 I/P, 2x Solid State Relay Outputs, 2 O/P, 1/32 DIN, AC, 4 Digit Single, USB, and CN32PT. Sold individually.
$387.16$419.93
Should ship between 13 Nov and 20 Nov
Subject to factory lead times
The Dwyer - CN616A is an Universal Multi-Channel Process Controller featuring 6-CH, 1/4 DIN, 4 Digit, 7-Segment LED Display, AC Supply, 2 Alarm O/P, and RS232/485. Part of the CN616A Series. Sold individually.
$1,171.58$1,270.74
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - DP41-E is a Process Digital Panel Meter featuring 1/8 DIN, 6 Digit, 14-Segment LED Display, AC Supply, and Analog Current/Voltage I/P. Part of the DP41 Series. Sold individually.
$1,117.71$1,212.31
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - SSRL240AC75 is a High Reliability Solid State Relay featuring 1-Phase, 24 Vac to 280 Vac Line Voltage, 75 A, 90 Vac to 280 Vac O/P, AC Control Signal, and Screw Mount. Part of the SSRL Series. Sold individually.
$140.17
Should ship between 26 Feb and 05 Mar
Subject to factory lead times
The Dwyer - D6400 is a Serial Interface Module featuring Universal I/P, 25/s Sample Rate, 7 Inputs, RS-485, DC Power, and Modbus RTU. It is rated for a temperature range of 16 °C. Part of the D6000 Series. Sold individually.
$656.33
Should ship between 27 Nov and 04 Dec
Subject to factory lead times
The Dwyer - SSRL240AC50 is a High Reliability Solid State Relay featuring 1-Phase, 24 Vac to 280 Vac Line Voltage, 50 A, 90 Vac to 280 Vac O/P, AC Control Signal, and Screw Mount. Part of the SSRL Series. Sold individually.
$93.60
Should ship between 26 Feb and 05 Mar
Subject to factory lead times
The Dwyer - CN16D3-R-AC is a Temperature/Process Controller featuring T/C, RTD, Analog V/I, 1 I/P, Relay, 1 O/P, 1/16 DIN, AC, 3.5 Digit Dual Display, Multiple Ramp & Soak, and CND3. Sold individually.
$253.69
Should ship between 11 Dec and 18 Dec
Subject to factory lead times
The Dwyer - CN733 is a Temperature Controller featuring Temperature, T/C, RTD, 1 I/P, Relay, 1 O/P, 1/4 DIN, AC, 3.5 Digit Dual Display, Serial, and CN730. Sold individually.
$196.09
Should ship between 15 Jan and 22 Jan
Subject to factory lead times
The Dwyer - DP20-M1 is a Multi-signal Panel Meter featuring Universal I/P, Temperature, Process, Power, 1/8 DIN, 3.5 Digit, Red Color LED Display, AC/DC Supply, and Isolated 4 mA to 20 mA Analog O/P. Part of the DP20 Series. Sold individually.
$248.43
Should ship between 01 Nov and 04 Nov
Subject to factory lead times
The Dwyer - DP400S is a Strain Gauge Meter featuring 1/8 DIN, Backlight Graphic OLED Display, AC/DC Supply, 2 Relay & Analog O/P, Isolated RS485 Communication, and RFID/NFC Enabled. Sold individually.
$673.21
Should ship between 11 Dec and 18 Dec
Subject to factory lead times
The Dwyer - CN32PT-440 is a Temperature featuring Process & Strain Controller, T/C, RTD, Thermistor, Analog V/I, Strain, 1 I/P, 2x DC Pulse Outputs, 2 O/P, 1/32 DIN, AC, 4 Digit Single, USB, and CN32PT. Sold individually.
$383.21$415.64
Should ship between 13 Nov and 20 Nov
Subject to factory lead times
The Dwyer - CN707 is a Limit Controller with Audible Buzzer featuring 2.8 " x 1.14 ", 3 Digit, LED Display, AC/DC Supply, J/K/S Thermocouple I/P, 24 Vac/Vdc, °F, and 15 A SPDT Relay O/P. Part of the CN700 Series. Sold individually.
$163.02
Should ship between 15 Jan and 22 Jan
Subject to factory lead times
The Dwyer - SSRL660DC75 is a High Reliability Solid State Relay featuring 1-Phase, 48 Vac to 660 Vac Line Voltage, 75 A, 4 Vdc to 32 Vdc O/P, DC Control Signal, and Screw Mount. Part of the SSRL Series. Sold individually.
$140.17
Should ship between 26 Feb and 05 Mar
Subject to factory lead times
The Dwyer - CNI3253-DC is a Temperature featuring Process & Strain Controller, T/C, RTD, Analog V/I, 1 I/P, 1x Analog Output & 1x SPDT Relay, 2 O/P, 1/32 DIN, DC, 3.5 Digit Single, and CNi. Sold individually.
$439.94$477.17
Should ship between 13 Nov and 20 Nov
Subject to factory lead times
The Dwyer - ILD24-UTP is an Universal Digital Panel Meter featuring 2.25 ", 4 Digit, 7-Segment LED Display, AC Supply, and Thermocouple/RTD /Thermistor & Analog Current/Voltage I/P. Part of the iLD-UTP Series. Sold individually.
$1,421.81$1,542.15
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - CN79033 is a Temperature Controller featuring Fuzzy Logic, 2-CH, Thermocouple I/P, 1/32 DIN, 4 Digit, 7-Segment LED Display, 100 Vac to 240 Vac, and Relay/Relay O/P. Part of the CN79000 Series. Sold individually.
$572.63
Should ship between 15 Jan and 22 Jan
Subject to factory lead times
The Dwyer - DP612A is an Universal Panel Meter featuring 12-CH, 1/4 DIN, 4 Digit, 7-Segment LED Display, 240 Vac Supply, 240 Vac Power & 2x Relay O/P, and RS232/485. Part of the DP612A Series. Sold individually.
$1,310.61$1,421.54
Should ship between 13 Nov and 20 Nov
Subject to factory lead times
The Dwyer - SSRL240DC100 is a High Reliability Solid State Relay featuring 1-Phase, 24 Vac to 280 Vac Line Voltage, 100 A, 3 Vdc to 32 Vdc O/P, DC Control Signal, and Screw Mount. Part of the SSRL Series. Sold individually.
$147.91
Should ship between 26 Feb and 05 Mar
Subject to factory lead times
The Dwyer - CNI32-AL is a Temperature & Process Limit Controller featuring 1/32 DIN, 4 Digit, 9-Segment LED Display, AC Supply, Universal I/P, 2 SPDT Relay O/P, 90 Vac to 240 Vac, and High Accuracy. Part of the CNi-AL Series. Sold individually.
$376.99$408.89
Should ship between 13 Nov and 20 Nov
Subject to factory lead times
The Dwyer - DP32PT is an Universal Digital Panel Meter featuring Temperature, Process, Strain, 1/32 DIN, 4 Digit, 9-Segment Programmable 3 Color LED Display, AC Supply, and USB. Part of the PLATINUM Series. Sold individually.
$273.60$296.75
Should ship between 13 Nov and 20 Nov
Subject to factory lead times
The Dwyer - DP8PT-006 is an Universal Digital Panel Meter featuring Temperature, Process, Strain, 1/8 DIN, 4 Digit, 9-Segment Programmable 3 Color LED Display, AC Supply, and Analog Current/Voltage. Part of the PLATINUM Series. Sold individually.
$517.24$561.02
Should ship between 13 Nov and 20 Nov
Subject to factory lead times
The Dwyer - PTC-14-A is a Digital Timer featuring 5 Programmable, Multi-Functions, Panel Mount, 4 Digit, Red Color LED Display, AC Supply, and 2x Relay Alarm O/P. Sold individually.
$193.65
Should ship between 13 Nov and 20 Nov
Subject to factory lead times
The Dwyer - HX92BV0 is a Relative Humidity Transmitter featuring 0 % to 100 %, 9 Vdc to 30 Vdc, 0 Vdc to 1 Vdc, and Wall Mount. Part of the HX92B Series. Sold individually.
$462.86$502.03
Should ship between 15 Jan and 22 Jan
Subject to factory lead times
The Dwyer - CN7233 is a Ramp & Soak Controller featuring T/C, RTD, Analog V/I, 1 I/P, Relay/Relay, 2 O/P, 1/4 DIN, AC, 3.5 Digit Dual, 2x Alarm Outputs, Multiple Ramp & Soak, Serial, and CN7200. Sold individually.
$255.27
Should ship between 15 Jan and 22 Jan
Subject to factory lead times
The Dwyer - CN32PT-220 is a Temperature featuring Process & Strain Controller, T/C, RTD, Thermistor, Analog V/I, Strain, 1 I/P, 2x Solid State Relay Outputs, 2 O/P, 1/32 DIN, AC, 4 Digit Single, USB, and CN32PT. Sold individually.
$387.16$419.93
Should ship between 13 Nov and 20 Nov
Subject to factory lead times
The Dwyer - CN616A is an Universal Multi-Channel Process Controller featuring 6-CH, 1/4 DIN, 4 Digit, 7-Segment LED Display, AC Supply, 2 Alarm O/P, and RS232/485. Part of the CN616A Series. Sold individually.
$1,171.58$1,270.74
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - DP41-E is a Process Digital Panel Meter featuring 1/8 DIN, 6 Digit, 14-Segment LED Display, AC Supply, and Analog Current/Voltage I/P. Part of the DP41 Series. Sold individually.
$1,117.71$1,212.31
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - SSRL240AC75 is a High Reliability Solid State Relay featuring 1-Phase, 24 Vac to 280 Vac Line Voltage, 75 A, 90 Vac to 280 Vac O/P, AC Control Signal, and Screw Mount. Part of the SSRL Series. Sold individually.
$140.17
Should ship between 26 Feb and 05 Mar
Subject to factory lead times
The Dwyer - D6400 is a Serial Interface Module featuring Universal I/P, 25/s Sample Rate, 7 Inputs, RS-485, DC Power, and Modbus RTU. It is rated for a temperature range of 16 °C. Part of the D6000 Series. Sold individually.
$656.33
Should ship between 27 Nov and 04 Dec
Subject to factory lead times
The Dwyer - SSRL240AC50 is a High Reliability Solid State Relay featuring 1-Phase, 24 Vac to 280 Vac Line Voltage, 50 A, 90 Vac to 280 Vac O/P, AC Control Signal, and Screw Mount. Part of the SSRL Series. Sold individually.
$93.60
Should ship between 26 Feb and 05 Mar
Subject to factory lead times
The Dwyer - CN16D3-R-AC is a Temperature/Process Controller featuring T/C, RTD, Analog V/I, 1 I/P, Relay, 1 O/P, 1/16 DIN, AC, 3.5 Digit Dual Display, Multiple Ramp & Soak, and CND3. Sold individually.
$253.69
Should ship between 11 Dec and 18 Dec
Subject to factory lead times
The Dwyer - CN733 is a Temperature Controller featuring Temperature, T/C, RTD, 1 I/P, Relay, 1 O/P, 1/4 DIN, AC, 3.5 Digit Dual Display, Serial, and CN730. Sold individually.
$196.09
Should ship between 15 Jan and 22 Jan
Subject to factory lead times
The Dwyer - DP20-M1 is a Multi-signal Panel Meter featuring Universal I/P, Temperature, Process, Power, 1/8 DIN, 3.5 Digit, Red Color LED Display, AC/DC Supply, and Isolated 4 mA to 20 mA Analog O/P. Part of the DP20 Series. Sold individually.
$248.43
Should ship between 01 Nov and 04 Nov
Subject to factory lead times
The Dwyer - DP400S is a Strain Gauge Meter featuring 1/8 DIN, Backlight Graphic OLED Display, AC/DC Supply, 2 Relay & Analog O/P, Isolated RS485 Communication, and RFID/NFC Enabled. Sold individually.
$673.21
Should ship between 11 Dec and 18 Dec
Subject to factory lead times
The Dwyer - CN32PT-440 is a Temperature featuring Process & Strain Controller, T/C, RTD, Thermistor, Analog V/I, Strain, 1 I/P, 2x DC Pulse Outputs, 2 O/P, 1/32 DIN, AC, 4 Digit Single, USB, and CN32PT. Sold individually.
$383.21$415.64
Should ship between 13 Nov and 20 Nov
Subject to factory lead times
The Dwyer - CN707 is a Limit Controller with Audible Buzzer featuring 2.8 " x 1.14 ", 3 Digit, LED Display, AC/DC Supply, J/K/S Thermocouple I/P, 24 Vac/Vdc, °F, and 15 A SPDT Relay O/P. Part of the CN700 Series. Sold individually.
$163.02
Should ship between 15 Jan and 22 Jan
Subject to factory lead times
The Dwyer - SSRL660DC75 is a High Reliability Solid State Relay featuring 1-Phase, 48 Vac to 660 Vac Line Voltage, 75 A, 4 Vdc to 32 Vdc O/P, DC Control Signal, and Screw Mount. Part of the SSRL Series. Sold individually.
$140.17
Should ship between 26 Feb and 05 Mar
Subject to factory lead times
The Dwyer - CNI3253-DC is a Temperature featuring Process & Strain Controller, T/C, RTD, Analog V/I, 1 I/P, 1x Analog Output & 1x SPDT Relay, 2 O/P, 1/32 DIN, DC, 3.5 Digit Single, and CNi. Sold individually.
$439.94$477.17
Should ship between 13 Nov and 20 Nov
Subject to factory lead times
The Dwyer - ILD24-UTP is an Universal Digital Panel Meter featuring 2.25 ", 4 Digit, 7-Segment LED Display, AC Supply, and Thermocouple/RTD /Thermistor & Analog Current/Voltage I/P. Part of the iLD-UTP Series. Sold individually.
$1,421.81$1,542.15
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - CN79033 is a Temperature Controller featuring Fuzzy Logic, 2-CH, Thermocouple I/P, 1/32 DIN, 4 Digit, 7-Segment LED Display, 100 Vac to 240 Vac, and Relay/Relay O/P. Part of the CN79000 Series. Sold individually.
$572.63
Should ship between 15 Jan and 22 Jan
Subject to factory lead times
The Dwyer - DP612A is an Universal Panel Meter featuring 12-CH, 1/4 DIN, 4 Digit, 7-Segment LED Display, 240 Vac Supply, 240 Vac Power & 2x Relay O/P, and RS232/485. Part of the DP612A Series. Sold individually.
$1,310.61$1,421.54
Should ship between 13 Nov and 20 Nov
Subject to factory lead times
The Dwyer - SSRL240DC100 is a High Reliability Solid State Relay featuring 1-Phase, 24 Vac to 280 Vac Line Voltage, 100 A, 3 Vdc to 32 Vdc O/P, DC Control Signal, and Screw Mount. Part of the SSRL Series. Sold individually.
$147.91
Should ship between 26 Feb and 05 Mar
Subject to factory lead times
The Dwyer - CNI32-AL is a Temperature & Process Limit Controller featuring 1/32 DIN, 4 Digit, 9-Segment LED Display, AC Supply, Universal I/P, 2 SPDT Relay O/P, 90 Vac to 240 Vac, and High Accuracy. Part of the CNi-AL Series. Sold individually.
$376.99$408.89
Should ship between 13 Nov and 20 Nov
Subject to factory lead times
The Dwyer - DP32PT is an Universal Digital Panel Meter featuring Temperature, Process, Strain, 1/32 DIN, 4 Digit, 9-Segment Programmable 3 Color LED Display, AC Supply, and USB. Part of the PLATINUM Series. Sold individually.
$273.60$296.75
Should ship between 13 Nov and 20 Nov
Subject to factory lead times
The Dwyer - DP8PT-006 is an Universal Digital Panel Meter featuring Temperature, Process, Strain, 1/8 DIN, 4 Digit, 9-Segment Programmable 3 Color LED Display, AC Supply, and Analog Current/Voltage. Part of the PLATINUM Series. Sold individually.
$517.24$561.02
Should ship between 13 Nov and 20 Nov
Subject to factory lead times
The Dwyer - PTC-14-A is a Digital Timer featuring 5 Programmable, Multi-Functions, Panel Mount, 4 Digit, Red Color LED Display, AC Supply, and 2x Relay Alarm O/P. Sold individually.
$193.65
Should ship between 13 Nov and 20 Nov
Subject to factory lead times
The Dwyer - HX92BV0 is a Relative Humidity Transmitter featuring 0 % to 100 %, 9 Vdc to 30 Vdc, 0 Vdc to 1 Vdc, and Wall Mount. Part of the HX92B Series. Sold individually.
$462.86$502.03
Should ship between 15 Jan and 22 Jan
Subject to factory lead times
FAQS
- Process controllers are devices that receive a measurement input from a sensor or transmitter, compare it to a setpoint, and generate an output signal to drive a final control element (valve, heater, pump, etc.). The main types include PID controllers (the industry standard for continuous process control — they use proportional, integral, and derivative algorithms to maintain the process variable at setpoint), process meters (display and monitor process variables with alarm outputs but may not have full PID control capability), and panel meters (display electrical signals — current, voltage, frequency — on a panel for operator visibility). Controllers are available as standalone DIN-rail or panel-mount units, or as software function blocks within a PLC or DCS.
- PID stands for Proportional-Integral-Derivative — three mathematical terms that together calculate the controller's output to minimize the error between the measured process variable and the desired setpoint. The Proportional term responds to the current error (how far the measurement is from setpoint), the Integral term responds to accumulated past error (correcting for persistent offset), and the Derivative term responds to the rate of change of error (dampening overshoot). PID control is the standard because it handles the vast majority of industrial process loops — temperature, pressure, flow, level — reliably and predictably. A well-tuned PID controller brings the process to setpoint quickly, with minimal overshoot, and holds it there despite disturbances. Most modern process controllers include auto-tuning features that automatically calculate optimal PID parameters for the specific loop.
- Start with the process requirements: what variable are you controlling (temperature, pressure, flow, level), what sensor type provides the input (thermocouple, RTD, 4–20 mA transmitter), and what type of output is needed to drive the final control element (4–20 mA analog, relay, SSR driver, pulse). Then consider the control mode — simple on/off control (sufficient for non-critical applications like tank heaters with wide deadbands), PID control (required for tight setpoint control), or more advanced control like cascade, ratio, or ramp/soak profiles (for complex processes like heat treatment or batch reactions). Physical format matters too — 1/16 DIN, 1/8 DIN, and 1/4 DIN sizes refer to the panel cutout dimensions and correspond to different display sizes and feature levels. Finally, verify communication options (RS-485, Modbus, Ethernet) if the controller needs to interface with a PLC, SCADA, or data logging system.
- A process meter measures, displays, and monitors a process variable — it accepts a sensor or transmitter input, shows the current value on a digital display, and can trigger alarm outputs when the value exceeds high or low thresholds. However, a process meter does not generate a modulating control output to drive a valve or heater — it is primarily an indicator and alarm device. A PID controller does everything a process meter does and adds closed-loop control — it continuously calculates and outputs a control signal (4–20 mA, relay, or SSR) to adjust the process and maintain the variable at setpoint. If your application only requires monitoring and alarming (e.g., displaying tank level with a high-level alarm), a process meter is sufficient and more cost-effective. If the application requires active control (e.g., maintaining furnace temperature at 350°F by modulating a gas valve), a PID controller is required.
- A ramp/soak profile is a programmed temperature (or other variable) trajectory that the controller follows over time — ramping the setpoint up or down at a defined rate, then holding (soaking) at a target value for a defined duration, then ramping to the next step. This is essential for processes where the rate of change matters as much as the final value — such as heat treatment (metallurgical tempering, annealing, stress relieving), ceramics firing, curing composites, pharmaceutical drying, and environmental test chambers. A controller with ramp/soak capability can store multi-step programs (e.g., ramp to 500°F at 5°F/minute, hold for 2 hours, ramp to 800°F at 3°F/minute, hold for 1 hour, cool to 200°F at 2°F/minute) and execute them automatically. Controllers vary in the number of steps and programs they can store — verify that the controller supports enough steps for your most complex process profile.