✓✓ What “PT100” means
PT → Platinum (the metal used in the sensor)
100 → 100 ohms resistance at 0 °C
How it works:-
Platinum’s electrical resistance changes predictably with temperature
As temperature goes up, resistance increases
By measuring the resistance, the temperature can be calculated
Key characteristics:-
Resistance at 0 °C: 100 Ω
Accuracy: Very high (more accurate than thermocouples)
Temperature range: About –200 °C to +850 °C
Stability: Excellent long-term stability
Common types
= 2-wire – simplest, less accurate
= 3-wire – most commonly used (compensates for lead resistance)
= 4-wire – highest accuracy (lab/precision use)
Where PT100 is used
Industrial temperature measurement
Process control (factories, plants)
HVAC systems
Laboratories
Food and pharmaceutical industries
