Thermistor vs. PT100: Which Temperature Sensor Should You Choose?
If you’re shopping for temperature sensors, you’ve likely stumbled upon thermistors and PT100s. But what is the difference between thermistor and PT100? While both measure temperature, they work in wildly different ways and suit unique applications. Let’s break it down in plain terms—no engineering jargon!
1. How They Work: Resistance Rules
- Thermistor (Thermal + Resistor): Made of ceramic or polymer, thermistors change resistance dramatically with tiny temperature shifts. Most are NTC (resistance drops as temps rise).
- PT100: A type of RTD (Resistance Temperature Detector), PT100s use platinum wire. Their resistance changes linearly—100Ω at 0°C, rising predictably with heat.
2. Temperature Range: Hot or Not?
- Thermistor: Best for -50°C to 150°C. Perfect for everyday gadgets like coffee makers or battery packs.
- PT100: Handles -200°C to 600°C+. Ideal for harsh industrial settings (think furnaces or chemical plants).
3. Accuracy & Sensitivity
- Thermistor: Super sensitive to small temp changes (±0.1°C accuracy) but only in their narrow range. Great for precision tasks.
- PT100: Less sensitive but more stable over wide ranges (±0.3°C to ±1°C). Reliable for long-term industrial use.
4. Price Tag: Budget vs. Long-Term
- Thermistor: Cheap (under $1), but fragile and short-lived in extreme conditions.
- PT100: Costlier (20–100+) but durable. Built to survive decades in tough environments.
5. Response Time: Speed Matters
- Thermistor: Tiny size = fast reaction (seconds). Good for quick readings.
- PT100: Bulkier = slower response (minutes). Not ideal for rapid temp swings.
When to Use Which?
- Choose a Thermistor if: You need fast, precise readings on a budget (e.g., consumer electronics, medical devices).
- Choose a PT100 if: You’re dealing with extreme temps or need rugged reliability (e.g., HVAC systems, oil refineries).
The Bottom Line
Thermistors and PT100s both measure temperature but cater to different needs. Match your project’s range, budget, and environment to pick the right tool. Still unsure? Drop a comment—we’ll help!