Pt100 and Pt1000 are the most common platinum resistance sensors, but choosing between them depends on your setup—not just “bigger number = better.” Their differences in resistance affect everything from cable length to self-heating.

Pt100 (100Ω at 0°C) works best for:

· Short cable runs (<10m): Its lower resistance means cable resistance (typically 0.1Ω/m) adds less error (e.g., 10m cable = 1Ω, ~0.03°C error).

· High-precision labs: More sensitive to small temp changes (1°C = ~0.385Ω change vs. Pt1000’s ~3.85Ω), making it better for 0.01°C resolution.

Pt1000 (1000Ω at 0°C) shines for:

· Long cable runs (>10m): Its higher resistance minimizes cable resistance impact (10m cable = 1Ω, ~0.003°C error).

· Industrial environments: Less prone to noise (e.g., from motors) because its signal is stronger than Pt100’s.

· Battery-powered loggers: Uses lower current (to avoid self-heating) while still producing a measurable signal.

Cost and availability:
Pt100s are cheaper and more widely available (~$50 vs. $80 for Pt1000). Pt1000s are worth the premium only if you need their specific advantages.

Quick decision guide:

· Lab with short cables + 0.01°C precision → Pt100.

· Factory with 50m cables + industrial noise → Pt1000.