RTD vs thermocouple: choosing industrial temperature sensing
Compare RTDs and thermocouples on accuracy, range, speed, and wiring — plus when to use thermistors, IR, or fiber-optic sensing instead.
Thermocouple
Two-metal temperature sensor.
Temperature sensor from joined dissimilar metals producing a millivolt signal (types J, K, T…). Wide range and rugged, but needs cold-junction compensation and is less accurate than RTDs.
Use the concept: 4–20 mA loop scaling · Engineering unit converter · Process instrumentation: signal, measurement and control
In depth
PID loop tuning: a field guide for process engineers
P, I, and D in plain language — manual tuning, Ziegler–Nichols, lambda, and the anti-windup and filtering details that decide whether a loop behaves.
Hazardous area classification, explained
Zones, divisions, gas groups and temperature classes decide which equipment may sit in a classified area. IP and NEMA ratings answer a different question.