resistance of temperature sensor

Temperature sensors used in geotechnical monitoring almost always rely on a predictable change in electrical resistance with temperature. The most common types—platinum RTDs like PT100 and PT1000—follow near-linear curves defined by standards such as IEC 60751. At 0°C, a PT100 reads 100 ohms; at 100°C, roughly 138.5 ohms. But in the field, lead-wire resistance, self-heating, and long-term drift can skew that relationship. Kingmach addresses these challenges through manufacturing practices that prioritize low inherent drift and stable encapsulation. Our sensors typically use thin-film or wire-wound platinum elements housed in stainless steel probes rated for immersion and high pressure. For long cable runs, we offer 3-wire and 4-wire configurations to cancel lead resistance errors—essential when the sensor sits hundreds of meters from the data logger. Every unit ships with a calibration certificate listing its specific R0 value and slope deviation, which makes it straightforward to plug into most datalogger software. While we build to standard tolerances (Class A or B depending on project needs), we can also supply matched pairs for differential temperature measurements where even 0.1°C uncertainty matters. Beyond the element itself, we pay attention to how the cable jacket and potting materials hold up after years of thermal cycling—because a cracked seal means moisture ingress, and moisture changes resistance. Our technical team works directly with site engineers to recommend sensor types, mounting accessories, and compatible readout equipment, so the resistance you measure is the temperature you trust.