The Temperature Sensor 1M NTC Thermistor NTC100K 250 White is a thermistor-based temperature sensor that is designed to measure temperature changes accurately. With a resistance of 100,000 Ohms (100k Ohms) at room temperature, this NTC thermistor exhibits a negative temperature coefficient (NTC), meaning its resistance decreases as the temperature increases. The sensor features a 1-meter cable, allowing for flexible placement in various applications. It is commonly used in temperature monitoring and control systems, HVAC (Heating, Ventilation, and Air Conditioning) equipment, appliances, and other applications where precise temperature measurement is required.

 

Package Includes:

• 1x Temperature Sensor 1M NTC Thermistor NTC100K 250 White
  
  

Features:

• Accurate Temperature Measurement: The sensor utilizes an NTC thermistor with a resistance of 100,000 Ohms (100k Ohms) at room temperature, enabling precise temperature sensing and measurement.
• Wide Temperature Range: The NTC thermistor exhibits a negative temperature coefficient, providing accurate readings across a wide temperature range, making it suitable for various applications.
• 1-Meter Cable Length: The sensor is equipped with a 1-meter-long cable, allowing for flexible placement and installation in different environments and applications.
• Reliable Performance: With its high-quality construction and robust design, the sensor ensures reliable and stable performance, delivering consistent temperature measurements over time.
• Easy Identification: The sensor is designed in white color, aiding in easy identification and integration into systems or equipment.
• Versatile Application: The sensor is suitable for a wide range of applications, including temperature monitoring and control systems, HVAC equipment, appliances, industrial processes, and more.
• Precise and Responsive: The NTC thermistor technology provides accurate and responsive temperature readings, allowing for timely adjustments and control based on temperature changes.
• Durable Build: Built to withstand demanding environments, the sensor is constructed with durability in mind, ensuring long-lasting performance and resistance to environmental factors.
• Easy Installation: The sensor is designed for easy installation, allowing for convenient integration into various systems and equipment setups.

 

Description:

The Temperature Sensor 1M NTC Thermistor NTC100K 250 White is a highly reliable and accurate temperature sensor designed to measure temperature changes in a wide range of applications. With its NTC thermistor technology, it offers precise temperature sensing capabilities. This sensor is equipped with a 1-meter long cable, allowing for convenient placement and installation in various environments. The 100,000 Ohms (100k Ohms) resistance at room temperature provides a stable reference point for temperature measurement. The NTC100K thermistor exhibits a negative temperature coefficient, meaning its resistance decreases as the temperature increases. This characteristic ensures responsive and accurate temperature readings across a wide temperature range. The white color of the sensor facilitates easy identification and integration into different systems and equipment. Its compact and durable design ensures long-term reliability and stable performance. The Temperature Sensor 1M NTC Thermistor NTC100K 250 White finds applications in temperature monitoring and control systems, HVAC systems, appliances, industrial equipment, and various other contexts where precise and reliable temperature measurement is essential. With its excellent temperature sensing capabilities and robust construction, this sensor provides valuable data for maintaining optimal performance, ensuring safety, and enabling efficient temperature control in a wide range of applications.

 

Principle of Work:

 

The NTC100K thermistor operates based on the principle of a negative temperature coefficient (NTC). It is composed of a temperature-sensitive semiconductor material, such as metal oxides or ceramics, which exhibits changes in electrical resistance in response to temperature variations. Internally, the NTC thermistor consists of a network of conductive particles embedded in the semiconductor material. When the temperature increases, the semiconductor material experiences thermal energy, causing the conductive particles to vibrate more vigorously. This vibration disrupts the flow of electrons, resulting in increased resistance. Conversely, as the temperature decreases, the conductivity of the material improves, leading to reduced resistance.

Calculating Temperature from NTC Thermistor Resistance: The relationship between temperature and resistance in an NTC thermistor can be described by the Steinhart-Hart equation. This equation allows the calculation of temperature based on the resistance of the thermistor. The equation is typically represented as:

1/T = A + B * ln(R) + C * (ln(R))^3

Where:

• T represents the absolute temperature in Kelvin
• R is the resistance of the thermistor
• A, B, and C are the Steinhart-Hart coefficients specific to the NTC thermistor and provided by the manufacturer

To calculate the temperature, you need to measure the resistance of the NTC100K thermistor using a suitable circuit or multimeter and then substitute the resistance value into the Steinhart-Hart equation along with the appropriate coefficients. By solving the equation, you can determine the temperature corresponding to the measured resistance value.

 

Pinout of the Board:

This cable can be plugged directly into some thermostat solutions or you can cut the connecter and use it as a normal NTC sensor.

You can connect the NTC Cable directly to your circuit you need to use the voltage divider method so you will need a 10k resistor and the pinout will going to be like the next pic:

NTC 10K Waterproof Probe	Description
Resistor side	VCC
Middle	Out
the other side of the NTC Cable	GND

 

Applications:

1. Household air conditioners: The NTC sensor can be used to monitor and control the temperature in residential air conditioning systems, ensuring optimal cooling efficiency and comfort.
2. Car air conditioners: In automotive air conditioning systems, the NTC sensor can provide temperature feedback to regulate the cooling process and maintain a comfortable cabin environment.
3. Refrigerators: The NTC sensor is employed in refrigerators to monitor and regulate the internal temperature, ensuring food preservation and preventing spoilage.
4. Freezers: Similar to refrigerators, freezers utilize the NTC sensor to maintain low temperatures, enabling the proper storage of frozen food items.
5. Water heaters: The NTC sensor is used in water heaters to measure the temperature of the water, allowing for accurate control and maintaining desired hot water temperatures.
6. Water dispensers: In water dispensers, the NTC sensor ensures that the dispensed water is at the desired temperature, whether it's cold, room temperature, or hot.
7. Heaters: The NTC sensor can be employed in heaters to monitor and regulate the temperature output, ensuring efficient and safe heating.
8. Dishwashers: Dishwashers utilize the NTC sensor to monitor water temperature, allowing for effective cleaning and ensuring proper drying cycles.
9. Temperature measurement and control in cabinets: The NTC sensor can be used to monitor and regulate the temperature in cabinets, such as server cabinets, ensuring proper cooling and preventing overheating of electronic components.
10. Washing machines: NTC sensors are used in washing machines to measure and control water temperature during different wash cycles, providing efficient and effective cleaning.
11. Dryers: In dryers, the NTC sensor helps monitor and control the temperature during the drying process, ensuring proper drying without overheating.
12. Medium and low-temperature drying ovens: NTC sensors are employed in drying ovens to monitor and control temperature during various drying applications, such as in laboratories or industrial processes.
13. Constant temperature ovens: The NTC sensor plays a crucial role in maintaining a constant temperature in ovens used for applications that require precise and stable temperature environments.

 

Circuit:

 

1. Connect the middle pin of the NTC thermistor to pin A0 on the Arduino.
2. Connect the other side of the NTC thermistor to the GND (ground) pin on the Arduino.
3. Connect the resistor side of the voltage divider to the 5V pin on the Arduino.

 

Library: 

you don't need any library to work with this sensor.

Code:

This code is going to print the Temperature Sensor on the Serial Monitor.

#define ntc_pin A0     // Pin to which the voltage divider is connected
#define vd_power_pin 2    // 5V for the voltage divider
#define nominal_resistance 100000    // Nominal resistance at 25°C
#define nominal_temperature 25  // Temperature for nominal resistance (almost always 25°C)
#define sampling_rate 5  // Number of samples
#define beta 3950 // The beta coefficient or the B value of the thermistor (usually 3000-4000) - check the datasheet for the accurate value.
#define Rref 10000  // Value of resistor used for the voltage divider

int samples = 0;  // Array to store the samples

void setup(void) {
  pinMode(vd_power_pin, OUTPUT);
  Serial.begin(9600);  // Initialize serial communication at a baud rate of 9600
}

void loop(void) {
  uint8_t i;
  float average;
  
  samples = 0;
  
  // Take voltage readings from the voltage divider
  digitalWrite(vd_power_pin, HIGH);
  for (i = 0; i < sampling_rate; i++) {
    samples += analogRead(ntc_pin);
    delay(10);
  }
  digitalWrite(vd_power_pin, LOW);
  
  average = 0;
  average = samples / sampling_rate;
  
  Serial.println("\n \n");
  Serial.print("ADC readings: ");
  Serial.println(average);
  
  // Calculate NTC resistance
  average = 1023 / average - 1;
  average = Rref / average;
  
  Serial.print("Thermistor resistance: ");
  Serial.println(average);
  
  float temperature;
  
  temperature = average / nominal_resistance;   // (R/Ro)
  temperature = log(temperature);         // ln(R/Ro)
  temperature /= beta;          // 1/B * ln(R/Ro)
  temperature += 1.0 / (nominal_temperature + 273.15); // + (1/To)
  temperature = 1.0 / temperature;         // Invert
  temperature -= 273.15;             // Convert absolute temp to Celsius
  
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println(" °C");
  
  delay(2000);
}

Technical Details:

Negative Temperature Coefficient (NTC) Thermistor:

• Resistance value at 25°C: R (25°C) = 100K ± 1%
• B value: B = 3950 ± 1%
• Thermistor type: MJB2
• Resistance value at 25°C: R (25°C) = 100K ± 1%
• B value: B = 3950 ± 1%
• Insulation resistance: 50MΩ or more at DC500V megger (between glass and lead)
• Thermal Time Constant (τ): τ ≤ 10^17S (in still air)
• Operating Temperature Range: -50°C to +260°C
• Line length: 1m
• Probe size: 5x25mm

 

Resources:

• Datasheet
• Tutorial

 

Comparisons:

The NTC Temperature Analog Sensor NTC 100K Waterproof Probe 1m and the LM35 are both temperature sensors, but they have some differences in terms of their characteristics and usage.

1. Type and Construction:

• NTC Temperature Analog Sensor NTC 100K Waterproof Probe 1m: This sensor utilizes a negative temperature coefficient (NTC) thermistor, which means its resistance decreases as the temperature increases. It is designed with a waterproof probe and has a 1-meter long cable for convenient placement in various environments.
• LM35: The LM35 is a temperature sensor based on the LM35 integrated circuit. It provides a linear voltage output that is directly proportional to the temperature in Celsius. It does not have a waterproof probe or a specific cable length.

2. Measurement Range:

• NTC Temperature Analog Sensor NTC 100K Waterproof Probe 1m: The measurement range of this sensor depends on the specific model but typically covers a wide temperature range, such as -50°C to +150°C or -55°C to +125°C.
• LM35: The LM35 has a narrower measurement range, typically from -55°C to +150°C.

3. Output:

• NTC Temperature Analog Sensor NTC 100K Waterproof Probe 1m: This sensor provides an analog output signal, usually in the form of resistance or voltage, which varies with temperature.
• LM35: The LM35 generates a linear analog voltage output, where the voltage represents the temperature directly in Celsius.

4. Accuracy:

• NTC Temperature Analog Sensor NTC 100K Waterproof Probe 1m: The accuracy of this sensor depends on the specific model but is generally within a specified tolerance, such as ±1% or ±0.5%.
• LM35: The LM35 offers good accuracy, typically within ±0.5°C.

5. Application:

• NTC Temperature Analog Sensor NTC 100K Waterproof Probe 1m: This sensor is suitable for various temperature sensing applications that require a waterproof and durable probe, such as industrial processes, HVAC systems, and environmental monitoring.
• LM35: The LM35 is commonly used in temperature monitoring and control systems, electronic equipment, and other applications where a linear temperature output is required.