Focusens Thermistor Temperature Sensor Probe - Waterproof TPE Plastic Overmolding, 3M Cable

This is a passive NTC thermistor sensor, providing a variable resistance output. You must use a voltage divider circuit with a pull-up resistor and an analog-to-digital converter (ADC) on a microcontroller (like Arduino) to read the resistance and convert it to a temperature value using the thermistor's beta value or a lookup table.

The standard TPE overmolding and stainless steel crimp provide IP68 waterproofing for general liquids. For prolonged use in saltwater or corrosive chemicals, verifying material compatibility is recommended. The supplier notes a specific saltwater fish tank solution is available, which may involve additional protective coatings or housing materials.

Connect one lead of the thermistor to an analog input pin on the Arduino (e.g., A0) via a voltage divider circuit using a fixed resistor (e.g., 10kΩ). The other lead connects to ground. Use the Arduino's ADC to read the voltage, calculate the thermistor's resistance, and then convert it to temperature using the Steinhart-Hart equation or a pre-defined library for NTC thermistors.

The probe offers a precision of ±0.6°C within the -20°C to +50°C range. Outside this range, accuracy may vary based on the thermistor's characteristic curve and your signal conditioning circuit. The primary specification is the thermistor's resistance tolerance of ±2% at 25°C.

The product data specifies an IP68 rating, which typically allows for continuous immersion beyond 1 meter, but the exact depth limit is not provided. The sealing is achieved via plastic overmolding and crimping, suitable for typical tank and pipe applications. For high-pressure environments, confirm the pressure rating with the manufacturer.