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 - RHCM-40-PL-W is a Dew Point Transmitter featuring Optical Chilled Mirror, 24 Vdc, (x2) 4 mA to 20 mA/0 Vdc to 5 Vdc/0 Vdc to 10 Vdc, Wall Mount, and IP65 Plastic Enclosure. It is rated for a temperature range of -40 °C to 60 °C. Part of the RHCM-40 Series. Sold individually.
$4,328.78
Should ship between 27 Nov and 04 Dec
Subject to factory lead times
The Dwyer - SCR19P-48-040 is an SCR Power Controller for Electrical Resistance Heater featuring 1-Phase, 480 Vac Line Voltage, 40 A, Isolated 4 mA to 20 mA O/P, Phase-Angle Firing, and Surface Mount. Part of the SCR19 Series. Sold individually.
$643.69
Should ship between 11 Dec and 18 Dec
Subject to factory lead times
The Dwyer - SCR19P-48-080-S30 is an SCR Power Controller for Electrical Resistance Heater featuring 1-Phase, 480 Vac Line Voltage, 80 A, Isolated 4 mA to 20 mA O/P, 30 s Soft Start & Phase-Angle Firing, and Surface Mount. Part of the SCR19 Series. Sold individually.
$741.47
Should ship between 11 Dec and 18 Dec
Subject to factory lead times
The Dwyer - SCR19Z-48-060 is an SCR Power Controller for Electrical Resistance Heater featuring 1-Phase, 480 Vac Line Voltage, 60 A, Isolated 4 mA to 20 mA O/P, Zero Crossing, and Surface Mount. Part of the SCR19 Series. Sold individually.
$578.51
Should ship between 11 Dec and 18 Dec
Subject to factory lead times
The Dwyer - SCR39P-20-080-S9 is an SCR Power Controller for Electrical Resistance Heater featuring 3-Phase, 208 Vac Line Voltage, 80 A, Isolated 4 mA to 20 mA O/P, 9 s Soft Start & Phase-Angle Firing, and Surface Mount. Part of the SCR39 Series. Sold individually.
$1,722.21
Should ship between 11 Dec and 18 Dec
Subject to factory lead times
The Dwyer - SCR39P-48-060-X is an SCR Power Controller for Electrical Resistance Heater featuring 3-Phase, 480 Vac Line Voltage, 60 A, Isolated 4 mA to 20 mA O/P, Phase-Angle Firing, and Surface Mount. Part of the SCR39 Series. Sold individually.
$1,582.73
Should ship between 11 Dec and 18 Dec
Subject to factory lead times
The Dwyer - SCR39Z-24-060 is an SCR Power Controller for Electrical Resistance Heater featuring 3-Phase, 240 Vac Line Voltage, 60 A, Isolated 4 mA to 20 mA O/P, Zero Crossing, and Surface Mount. Part of the SCR39 Series. Sold individually.
$1,026.66
Should ship between 11 Dec and 18 Dec
Subject to factory lead times
The Dwyer - SCR39Z-24-080 is an SCR Power Controller for Electrical Resistance Heater featuring 3-Phase, 240 Vac Line Voltage, 80 A, Isolated 4 mA to 20 mA O/P, Zero Crossing, and Surface Mount. Part of the SCR39 Series. Sold individually.
$1,091.83
Should ship between 11 Dec and 18 Dec
Subject to factory lead times
The Dwyer - SCR39Z-48-060 is an SCR Power Controller for Electrical Resistance Heater featuring 3-Phase, 480 Vac Line Voltage, 60 A, Isolated 4 mA to 20 mA O/P, Zero Crossing, and Surface Mount. Part of the SCR39 Series. Sold individually.
$1,091.83
Should ship between 11 Dec and 18 Dec
Subject to factory lead times
The Dwyer - SP-003-2 is a Monitoring Smart Probe featuring Layer N, Environmental, Modular, Temperature, Humidity, Barometric Pressure, Dewpoint, Heat Index, Humidex, Internal, and Tube Housing. It is rated for a temperature range of -40 °C to 85 °C. Part of the SP-003 Series. Sold individually.
$242.81$263.36
Should ship between 01 Nov and 04 Nov
Subject to factory lead times
The Dwyer - SP-016-1 is a Heat Flux Thermopile Smart Probe featuring Layer N, Modular, 2 Channels, M12-4-pin, Heat Flux & J, K, T, E, N, R, S, B & C Input Types, and 2 Digital I/O Pins. It is rated for a temperature range of -40 °C to 850 °C. Part of the SP-016 Series. Sold individually.
$206.26$223.71
Should ship between 28 Oct and 02 Nov
Subject to factory lead times
The Dwyer - SSRL660AC100 is a High Reliability Solid State Relay featuring 1-Phase, 48 Vac to 660 Vac Line Voltage, 100 A, 90 Vac to 280 Vac O/P, AC Control Signal, and Screw Mount. Part of the SSRL Series. Sold individually.
$164.82
Should ship between 26 Feb and 05 Mar
Subject to factory lead times
The Dwyer - ST5-IP-EN is a High Performance Stepper Drive featuring 24 Vdc to 48 Vdc, 0.5 A to 5 A/Phase, 8 I/P & 4 O/P, Q Programmer, Ethernet/IP & MODBUS TCP, and Encoder Following. Part of the ST Series. Sold individually.
$1,303.07
Should ship between 13 Nov and 20 Nov
Subject to factory lead times
The Dwyer - STAC6-S-220V is a High Performance Stepper Drive featuring 94 Vac to 265 Vac, 0.5 A to 3.2 A, 7 I/P & 3 O/P, and STAC6 Configurator. Part of the STAC6 Series. Sold individually.
$2,173.72
Should ship between 13 Nov and 20 Nov
Subject to factory lead times
The Dwyer - STM23Q-3EE is an Integrated Stepper Drive/Motor with Advanced Feature & Control Option featuring NEMA 23, Encoder, 210 oz-in Max Torque, RS232/Ethernet, and Stand Alone Programming. Part of the STM Series. Sold individually.
$1,354.08
Should ship between 13 Nov and 20 Nov
Subject to factory lead times
The Dwyer - STM23S-2EE is an Integrated Stepper Drive/Motor with Advanced Feature & Control Option featuring NEMA 23, Encoder, 125 oz-in Max Torque, RS232/Ethernet, Pulse & Direction, Analog In, Joystick, and Serial Command. Part of the STM Series. Sold individually.
$1,027.94
Should ship between 13 Nov and 20 Nov
Subject to factory lead times
The Dwyer - STM24QF-3AN is an Integrated Stepper Drive/Motor with Advanced Feature & Control Option featuring NEMA 24, Single Shaft, 340 oz-in Max Torque, RS232, and Stand Alone Programming. Part of the STM Series. Sold individually.
$1,105.34
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - XW-ED-PRO is a Wireless Universal Transmitter featuring Digital, M12 Connector, 1 to 4 Channels, Medium Range, Global (2.4 GHz), IP65 NEMA 4X, and Discrete I/O. Part of the XW Series. Sold individually.
$342.48$371.46
Should ship between 20 Nov and 04 Dec
Subject to factory lead times
The Dwyer - ZW-CM-BTH is a Wireless Temperature/Humidity & Barometric Pressure Sensor featuring Digital, Integrated, 3 Channels, Medium Range, Global (2.4 GHz), and Wall Mount. Part of the ZW-CM Series. Sold individually.
$293.82$318.69
Should ship between 13 Nov and 20 Nov
Subject to factory lead times
High accuracy 4 mA to 20 mA loop-powered indicators for NOSHOK 11 Series Sanitary, 300, 615/616 Series pressure transmitters and 800 Series temperature transmittersCan be fitted to NOSHOK pressure transmitters utilizing a 4 mA to 20 mA output signal and the DIN 175301-803 Form A connectorEasily inserted between the transmitter body and the connectorProgrammable to display a range of -1999 to 9999; may be tilted for better viewing
$511.14
In Stock (9)Ships within 1 business day
High accuracy 4 mA to 20 mA loop-powered indicators for NOSHOK 11 Series Sanitary, 300, 615/616 Series pressure transmitters and 800 Series temperature transmittersCan be fitted to NOSHOK pressure transmitters utilizing a 4 mA to 20 mA output signal and the DIN 175301-803 Form A connectorEasily inserted between the transmitter body and the connectorProgrammable to display a range of -1999 to 9999; may be tilted for better viewing
$618.66
Low Stock (5)Ships within 1 business day
Provides compact digital display of any desired unit of pressure, temperature, level, force, or flow measurement3-1/2 digit, 0.6" high display with a span range of 0 to 1999Positive image reflective LCDSpan and zero offset capabilitiesNegative pressure and overpressure indicationSelectable decimal point position
$485.00
Available for Purchase
Subject to factory lead times
Provides compact digital display of any desired unit of pressure, temperature, level, force, or flow measurement3-1/2 digit, 0.6" high display with a span range of 0 to 1999Positive image reflective LCDSpan and zero offset capabilitiesNegative pressure and overpressure indicationSelectable decimal point position
$496.34
Should ship between 26 Oct and 30 Oct
Subject to factory lead times
Conductivity controller, 120 VAC, 26K ohm sensitivity, DIN mount socket style.
$442.35
Should ship between 13 Nov and 27 Nov
Subject to factory lead times
The Dwyer - RHCM-40-PL-W is a Dew Point Transmitter featuring Optical Chilled Mirror, 24 Vdc, (x2) 4 mA to 20 mA/0 Vdc to 5 Vdc/0 Vdc to 10 Vdc, Wall Mount, and IP65 Plastic Enclosure. It is rated for a temperature range of -40 °C to 60 °C. Part of the RHCM-40 Series. Sold individually.
$4,328.78
Should ship between 27 Nov and 04 Dec
Subject to factory lead times
The Dwyer - SCR19P-48-040 is an SCR Power Controller for Electrical Resistance Heater featuring 1-Phase, 480 Vac Line Voltage, 40 A, Isolated 4 mA to 20 mA O/P, Phase-Angle Firing, and Surface Mount. Part of the SCR19 Series. Sold individually.
$643.69
Should ship between 11 Dec and 18 Dec
Subject to factory lead times
The Dwyer - SCR19P-48-080-S30 is an SCR Power Controller for Electrical Resistance Heater featuring 1-Phase, 480 Vac Line Voltage, 80 A, Isolated 4 mA to 20 mA O/P, 30 s Soft Start & Phase-Angle Firing, and Surface Mount. Part of the SCR19 Series. Sold individually.
$741.47
Should ship between 11 Dec and 18 Dec
Subject to factory lead times
The Dwyer - SCR19Z-48-060 is an SCR Power Controller for Electrical Resistance Heater featuring 1-Phase, 480 Vac Line Voltage, 60 A, Isolated 4 mA to 20 mA O/P, Zero Crossing, and Surface Mount. Part of the SCR19 Series. Sold individually.
$578.51
Should ship between 11 Dec and 18 Dec
Subject to factory lead times
The Dwyer - SCR39P-20-080-S9 is an SCR Power Controller for Electrical Resistance Heater featuring 3-Phase, 208 Vac Line Voltage, 80 A, Isolated 4 mA to 20 mA O/P, 9 s Soft Start & Phase-Angle Firing, and Surface Mount. Part of the SCR39 Series. Sold individually.
$1,722.21
Should ship between 11 Dec and 18 Dec
Subject to factory lead times
The Dwyer - SCR39P-48-060-X is an SCR Power Controller for Electrical Resistance Heater featuring 3-Phase, 480 Vac Line Voltage, 60 A, Isolated 4 mA to 20 mA O/P, Phase-Angle Firing, and Surface Mount. Part of the SCR39 Series. Sold individually.
$1,582.73
Should ship between 11 Dec and 18 Dec
Subject to factory lead times
The Dwyer - SCR39Z-24-060 is an SCR Power Controller for Electrical Resistance Heater featuring 3-Phase, 240 Vac Line Voltage, 60 A, Isolated 4 mA to 20 mA O/P, Zero Crossing, and Surface Mount. Part of the SCR39 Series. Sold individually.
$1,026.66
Should ship between 11 Dec and 18 Dec
Subject to factory lead times
The Dwyer - SCR39Z-24-080 is an SCR Power Controller for Electrical Resistance Heater featuring 3-Phase, 240 Vac Line Voltage, 80 A, Isolated 4 mA to 20 mA O/P, Zero Crossing, and Surface Mount. Part of the SCR39 Series. Sold individually.
$1,091.83
Should ship between 11 Dec and 18 Dec
Subject to factory lead times
The Dwyer - SCR39Z-48-060 is an SCR Power Controller for Electrical Resistance Heater featuring 3-Phase, 480 Vac Line Voltage, 60 A, Isolated 4 mA to 20 mA O/P, Zero Crossing, and Surface Mount. Part of the SCR39 Series. Sold individually.
$1,091.83
Should ship between 11 Dec and 18 Dec
Subject to factory lead times
The Dwyer - SP-003-2 is a Monitoring Smart Probe featuring Layer N, Environmental, Modular, Temperature, Humidity, Barometric Pressure, Dewpoint, Heat Index, Humidex, Internal, and Tube Housing. It is rated for a temperature range of -40 °C to 85 °C. Part of the SP-003 Series. Sold individually.
$242.81$263.36
Should ship between 01 Nov and 04 Nov
Subject to factory lead times
The Dwyer - SP-016-1 is a Heat Flux Thermopile Smart Probe featuring Layer N, Modular, 2 Channels, M12-4-pin, Heat Flux & J, K, T, E, N, R, S, B & C Input Types, and 2 Digital I/O Pins. It is rated for a temperature range of -40 °C to 850 °C. Part of the SP-016 Series. Sold individually.
$206.26$223.71
Should ship between 28 Oct and 02 Nov
Subject to factory lead times
The Dwyer - SSRL660AC100 is a High Reliability Solid State Relay featuring 1-Phase, 48 Vac to 660 Vac Line Voltage, 100 A, 90 Vac to 280 Vac O/P, AC Control Signal, and Screw Mount. Part of the SSRL Series. Sold individually.
$164.82
Should ship between 26 Feb and 05 Mar
Subject to factory lead times
The Dwyer - ST5-IP-EN is a High Performance Stepper Drive featuring 24 Vdc to 48 Vdc, 0.5 A to 5 A/Phase, 8 I/P & 4 O/P, Q Programmer, Ethernet/IP & MODBUS TCP, and Encoder Following. Part of the ST Series. Sold individually.
$1,303.07
Should ship between 13 Nov and 20 Nov
Subject to factory lead times
The Dwyer - STAC6-S-220V is a High Performance Stepper Drive featuring 94 Vac to 265 Vac, 0.5 A to 3.2 A, 7 I/P & 3 O/P, and STAC6 Configurator. Part of the STAC6 Series. Sold individually.
$2,173.72
Should ship between 13 Nov and 20 Nov
Subject to factory lead times
The Dwyer - STM23Q-3EE is an Integrated Stepper Drive/Motor with Advanced Feature & Control Option featuring NEMA 23, Encoder, 210 oz-in Max Torque, RS232/Ethernet, and Stand Alone Programming. Part of the STM Series. Sold individually.
$1,354.08
Should ship between 13 Nov and 20 Nov
Subject to factory lead times
The Dwyer - STM23S-2EE is an Integrated Stepper Drive/Motor with Advanced Feature & Control Option featuring NEMA 23, Encoder, 125 oz-in Max Torque, RS232/Ethernet, Pulse & Direction, Analog In, Joystick, and Serial Command. Part of the STM Series. Sold individually.
$1,027.94
Should ship between 13 Nov and 20 Nov
Subject to factory lead times
The Dwyer - STM24QF-3AN is an Integrated Stepper Drive/Motor with Advanced Feature & Control Option featuring NEMA 24, Single Shaft, 340 oz-in Max Torque, RS232, and Stand Alone Programming. Part of the STM Series. Sold individually.
$1,105.34
Should ship between 06 Nov and 13 Nov
Subject to factory lead times
The Dwyer - XW-ED-PRO is a Wireless Universal Transmitter featuring Digital, M12 Connector, 1 to 4 Channels, Medium Range, Global (2.4 GHz), IP65 NEMA 4X, and Discrete I/O. Part of the XW Series. Sold individually.
$342.48$371.46
Should ship between 20 Nov and 04 Dec
Subject to factory lead times
The Dwyer - ZW-CM-BTH is a Wireless Temperature/Humidity & Barometric Pressure Sensor featuring Digital, Integrated, 3 Channels, Medium Range, Global (2.4 GHz), and Wall Mount. Part of the ZW-CM Series. Sold individually.
$293.82$318.69
Should ship between 13 Nov and 20 Nov
Subject to factory lead times
High accuracy 4 mA to 20 mA loop-powered indicators for NOSHOK 11 Series Sanitary, 300, 615/616 Series pressure transmitters and 800 Series temperature transmittersCan be fitted to NOSHOK pressure transmitters utilizing a 4 mA to 20 mA output signal and the DIN 175301-803 Form A connectorEasily inserted between the transmitter body and the connectorProgrammable to display a range of -1999 to 9999; may be tilted for better viewing
$511.14
In Stock (9)Ships within 1 business day
High accuracy 4 mA to 20 mA loop-powered indicators for NOSHOK 11 Series Sanitary, 300, 615/616 Series pressure transmitters and 800 Series temperature transmittersCan be fitted to NOSHOK pressure transmitters utilizing a 4 mA to 20 mA output signal and the DIN 175301-803 Form A connectorEasily inserted between the transmitter body and the connectorProgrammable to display a range of -1999 to 9999; may be tilted for better viewing
$618.66
Low Stock (5)Ships within 1 business day
Provides compact digital display of any desired unit of pressure, temperature, level, force, or flow measurement3-1/2 digit, 0.6" high display with a span range of 0 to 1999Positive image reflective LCDSpan and zero offset capabilitiesNegative pressure and overpressure indicationSelectable decimal point position
$485.00
Available for Purchase
Subject to factory lead times
Provides compact digital display of any desired unit of pressure, temperature, level, force, or flow measurement3-1/2 digit, 0.6" high display with a span range of 0 to 1999Positive image reflective LCDSpan and zero offset capabilitiesNegative pressure and overpressure indicationSelectable decimal point position
$496.34
Should ship between 26 Oct and 30 Oct
Subject to factory lead times
Conductivity controller, 120 VAC, 26K ohm sensitivity, DIN mount socket style.
$442.35
Should ship between 13 Nov and 27 Nov
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.