How to find the right Temperature Probes & Sensors AI guide

What the AI looks for in Temperature Probes & Sensors

Sensor type

Type K thermocouple for wide range and general use; type T for low temperatures and food; Pt100 RTD for accuracy and stability at moderate temperatures; NTC thermistor only where the device specifies it Each controller or meter reads only the sensor type it is configured for.

RTD wiring

Use 3-wire for most installs and 4-wire for lab accuracy; 2-wire only for short leads Lead-wire resistance adds error that 3- and 4-wire connections cancel.

RTD tolerance class

Class A is tighter than Class B per IEC 60751 This is the real accuracy difference between otherwise identical-looking probes.

Junction style

Grounded for fastest response; ungrounded where electrical isolation or noise matters; exposed only for still air or gas It trades response speed against noise immunity and durability.

Connectors and extension wire

Thermocouple extension wire and connectors must be the same type as the sensor, color-coded to the matching standard Copper wire or mismatched connectors create extra junctions and offset errors.

Fit

Match sheath diameter to the thermowell or fitting bore, and choose a length that gives enough immersion, roughly ten or more sheath diameters Shallow immersion reads the fitting temperature, not the process temperature.