Process control · Control mode, sensor and safety limit
A temperature controller is only as good as its sensor and its tuning. Match the control mode to how fast the process responds, choose a thermocouple or RTD for the temperature range and accuracy you need, and never rely on the same controller to protect the process: add a separate limit controller that latches off.
Panel-mount and DIN-rail electronic temperature controllers with thermocouple or RTD inputs for ovens, extruders, moulds, heaters and process equipment, plus mechanical capillary thermostats. Mould temperature control units and chillers are outside this page.
CNFX editorial research · Sources checked October 11, 2026 · 6 sources
Pick the control mode for how the process responds
DwyerOmega explains that a temperature controller compares a sensor reading with the setpoint and drives an output. On/off control switches fully on or off and suits processes where precise control is not needed, that cannot take frequent switching, or whose large mass changes temperature slowly. Proportional control reduces output as the temperature nears the setpoint, reducing overshoot and oscillation. [1]
PID control adds integral action to remove steady-state error and derivative action to damp overshoot; the terms are set in time units and must be tuned to the process. DwyerOmega says PID "is best used in systems which have a relatively small mass, those which react quickly to changes in the energy added to the process", and notes that autotune controllers tune themselves. [1]
Ask the supplier whether autotune runs at startup or at setpoint, how many control loops one unit handles, and whether heating and cooling outputs can be controlled together.
Give the supplier the process (oven, extruder zone, bath, mould), its temperature range, how fast it heats and cools, the heater power and supply, and the accuracy the product needs.
02
Choose a thermocouple or RTD input
DwyerOmega explains that thermocouples generate a millivolt signal from the junction of two metals and need reference-junction compensation; standard types include J, K, T, E and N, and some types reach about 2,500 °C. RTDs change resistance almost linearly and are more stable in the long term; DwyerOmega gives the PT100 as 100 Ω at 0 °C and states that more than 90% of RTDs are designed for temperatures below 400 °C. [2]
DwyerOmega notes that thermocouples drift more over time at high temperature but respond faster, while RTDs are wired as 2-, 3- or 4-wire circuits with lead effects depending on wiring, and cost about two to three times as much as comparable thermocouple assemblies. Make sure the controller input is configured for the exact sensor type. [2]
03
Add a separate limit controller for safety
DwyerOmega describes a safety limit controller as an on/off controller with a latching output that needs a manual reset after it trips. [1]
Use its own sensor and its own switching device, so a failed control sensor or a welded output cannot hold the heater on. Ask the supplier which limit controllers and approvals are available for ovens, furnaces and heaters in your market.
04
Fit the panel cut-out and output to the heater
DwyerOmega points to standard DIN sizes for panel cut-outs and notes that multi-loop controllers can handle more than a single control loop. [1]
Strong lists solid state relays and SCR power modules, and Maxwell solid state relays, to switch or modulate heating loads from controller outputs. Ask whether the controller has relay, SSR-drive or analogue outputs and size the switching device for the heater current. [4][3]
05
Who lists controllers, relays, power modules and thermostats
CNC Electric lists temperature controllers among its low-voltage products. [5]
Maxwell lists PID and on/off panel-mount controllers, temperature transmitters and solid state relays; Strong lists PID controllers, solid state relays, SCR power modules and thermocouple and RTD sensors; Jaye lists capillary and liquid-expansion thermostats with its heaters. [3][4][6]
06
Sensor, controller, switching device and independent limit
Sensor input, control method and output rating for a heater loop
The sensor-type, control-method and output rows rest on DwyerOmega and Strong; supply, display, ambient and enclosure rows have no published value here and need the supplier's figures.
Field
What it means and published values
Ask the supplier for
Temperature range (°C)
Limited by sensor: DwyerOmega states more than 90% of RTDs are designed for temperatures below 400 °C. [2]
Paste it into your enquiry below or into an email to a maker, then replace every bracket.
Process: [type; temperature range; heat-up and cool-down; accuracy needed]
Sensor: [thermocouple type or RTD; class; wiring; sheath]
Control: [on/off, PID, autotune; heating and cooling; number of loops]
Output: [relay, SSR drive or analogue; heater power and supply]
Safety: [separate limit controller; approvals]
Panel: [DIN size; front IP; communication]
Documents: [manual; input accuracy; certificates]
Maxwell and Strong list PID controllers alongside solid state relays, Strong also SCR power modules and thermocouple and RTD sensors; Jaye lists capillary and liquid-expansion thermostats with its heaters.
Xiamen Maxwell Automation Limited
Manufacturing site to be confirmed for the order
Lists PID and on/off panel-mount temperature controllers, temperature transmitters and solid state relays.
Explore company information and manufacturing capabilities, then discuss the scope of your project with a relevant supplier.
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Compiled and source-reviewed by the CNFX editorial team.
Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review
· Page last updated 13 October 2026
Buyer questions
On/off or PID temperature control?
DwyerOmega suggests on/off where precise control is not needed or the mass is large and slow, and PID with autotune for smaller, fast-reacting systems. [1]
Thermocouple or RTD?
DwyerOmega notes thermocouples reach much higher temperatures and respond faster, while RTDs such as PT100 are more stable, and states that more than 90% of RTDs are designed for temperatures below 400 °C. [2]
Do I need a separate limit controller?
DwyerOmega describes safety limit controllers as latching, manually reset controllers used as redundant shutdowns when process limits are reached. [1]
Sources and what still needs a direct check
Sources checked 2026-10-11. DwyerOmega (Dwyer Instruments) is a manufacturer of controllers and sensors; its resource pages were read in the browser. Supplier pages describe their own offers. IEC 60584 and IEC 60751 sensor standards were not read for this page.
