Temperature controllers accept inputs from temperature sensors or thermometers, and output a control signal to keep the temperature at the desired level. Temperature controllers use several different control techniques. Limit control establishes set points that, when reached, sends a signal to stop or start a process variable. Linear control matches a variable input signal with a correspondingly variable control signal. Feedforward control does not require a sensor and provides direct control-compensation from the reference signal. Proportional, integral and derivative (PID) control requires real-time system feedback. PID control monitors the error between the desired variable value and the actual value, and adjusts the control accordingly. Fuzzy logic is a control technique in which variables can have imprecise values (as in partial truth) rather than a binary status (completely true or completely false). Temperature controllers that use advanced or non-linear controls such as neural networking, adaptive gain, or emerging algorithms are also available. Specifications for temperature controllers include number of inputs, number of outputs, input types, output types, and number of zones (if applicable). The number of inputs is the total number of signals sent to the temperature controller. The number of outputs is the sum of all outputs used to control, compensate or correct the process. Input types for temperature controllers include direct current (DC) voltage, current loops, analog signals from resistors or potentiometers, frequency inputs, and switch or relay inputs. Output types include analog voltage, current loops, switch or relay outputs, and pulses or frequencies. Some temperature controllers can also send inputs or receive outputs in serial, parallel, Ethernet or other digital formats which indicate a process variable. Others can send inputs and receive outputs from information converted to an industrial fieldbus protocol such as CANbus, PROFIBUS®, or SERCOS. PROFIBUS is a registered trademark of PROFIBUS International.
Temperature controllers accept inputs from temperature sensors or thermometers, and output a control signal to keep the temperature at the desired level. Temperature controllers use several different control techniques. Limit control establishes set points that, when reached, sends a signal to stop or start a process variable. Linear control matches a variable input signal with a correspondingly variable control signal. Feedforward control does not require a sensor and provides direct control-compensation from the reference signal. Proportional, integral and derivative (PID) control requires real-time system feedback. PID control monitors the error between the desired variable value and the actual value, and adjusts the control accordingly. Fuzzy logic is a control technique in which variables can have imprecise values (as in partial truth) rather than a binary status (completely true or completely false). Temperature controllers that use advanced or non-linear controls such as neural networking, adaptive gain, or emerging algorithms are also available. Specifications for temperature controllers include number of inputs, number of outputs, input types, output types, and number of zones (if applicable). The number of inputs is the total number of signals sent to the temperature controller. The number of outputs is the sum of all outputs used to control, compensate or correct the process. Input types for temperature controllers include direct current (DC) voltage, current loops, analog signals from resistors or potentiometers, frequency inputs, and switch or relay inputs. Output types include analog voltage, current loops, switch or relay outputs, and pulses or frequencies. Some temperature controllers can also send inputs or receive outputs in serial, parallel, Ethernet or other digital formats which indicate a process variable. Others can send inputs and receive outputs from information converted to an industrial fieldbus protocol such as CANbus, PROFIBUS®, or SERCOS. PROFIBUS is a registered trademark of PROFIBUS International. Temperature controllers differ in terms of user interface features and regulatory compliance. Many temperature controls feature a digital front panel or analog components such as knobs, switches, and meters. Computer-programmable, web-enabled, and Ethernet or network-ready temperature controllers are also available. In terms of compliance, a temperature control that is destined for sale in the European marketplace should meet the requirements of the Restriction of Hazardous Substances (RoHS) and Waste Electrical and Electronics Equipment (WEEE) directives from the European Union (EU).
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Products & Services Related to Temperature Controllers
Batch Controllers
Batch controllers maintain the correct size of a discrete batch of process material, such as the volume of a liquid. They are often interfaced with sensors such as load cells, or with volumetric flow meters.
Flow Controllers
Flow controllers monitor and maintain proper humidity levels in environmental test applications, or in other areas such as food storage or electronic room regulation.
Humidity Controllers
Humidity controllers monitor and maintain proper humidity levels in environmental test applications, food storage areas, and electronic equipment rooms.
Level Controllers
Level controllers monitor, regulate, and control liquid or solid levels in a process.
Pump Controllers
Pump controllers monitor flow and/or level variables, and control a pump accordingly to maintain the desired levels. Pump control can include simply turning a pump on and off, or more advanced controls for pump speed, output pressure, etc.
Web Tension Indicators
Web tension indicators measure and report tension parameters in web or other flat-sheet production processes. Some types of web tension indicators have control functionality as well.
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Engineering Web: Temperature Controllers
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Part Numbers for Temperature Controllers
| Part # |
Distributor |
Manufacturer |
Product Category |
Description |
| SL4848-CR |
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Automationdirect.com
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Universal Process Controllers
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1/32 DIN Panel size, PID with autotune, UL, CUL and CE approvals |
| Temperature Controllers |
U.S. Plastic Corporation |
Process Technology
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Temperature Instruments, All Types
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Hook up for temperature over-load is provided, 1 year warranty |
| SL4896-LRE |
|
Automationdirect.com
|
Temperature Instruments, All Types
|
1/32 DIN Panel size, PID with autotune, UL, CUL and CE approvals |
| SL9696-VRE |
|
Automationdirect.com
|
Temperature Instruments, All Types
|
1/32 DIN Panel size, PID with autotune, UL, CUL and CE approvals |
| SL4848-VR |
|
Automationdirect.com
|
Universal Process Controllers
|
1/32 DIN Panel size, PID with autotune, UL, CUL and CE approvals |
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