B3950 100K NTC Thermistor Temperature Sensor 3x20mm Stainless Steel Probe w/ 1m Cable & XH2.54 Connector

This is a passive resistive sensor and does not have a supply voltage. You must interface it with a measurement circuit, typically a voltage divider. Use a pull-up resistor (e.g., 10KΩ) connected to your microcontroller's logic voltage (3.3V or 5V) and measure the voltage drop across the thermistor with an ADC pin. Ensure the total current through the thermistor is low to avoid self-heating errors.

For precise conversion, use the Steinhart-Hart equation or a lookup table specific to the B3950 100K thermistor curve. Most microcontroller libraries for NTC sensors require you to input the B-value (typically around 3950) and nominal resistance (100K at 25°C). Avoid using a linear approximation, as the NTC response is exponential. The sensor datasheet provides the necessary coefficients.

The stainless steel probe sheath provides a high degree of water and corrosion resistance, making it suitable for immersion in non-conductive liquids. However, the XH2.54 connector and cable splice points are not rated for submersion. For fully waterproof applications, ensure the connector is kept dry or use a waterproof sealant.

The dissipation constant (5mW/°C) indicates how much power is required to raise the thermistor's temperature by 1°C above its surroundings. A low value means the sensor is sensitive to self-heating from measurement current. To minimize error, keep the excitation current through the thermistor low (typically under 0.1 mA) when taking readings.