NTC, PTC, PT100, DS18B20 per sensori sonda di temperatura

NTC, PTC, PT100, DS18B20 Temperature probes and temperature sensors play an important role in the field of temperature measurement. The following is a detailed introduction to temperature probe sensors:

There are many types of temperature sensors, compreso:
Thermocouples
These sensors are made of two dissimilar metals that connect at two points to form a junction. They are reliable, accurate, and can operate over a wide range of temperatures.

Resistance temperature detectors (RTD)
These sensors are based on the change in resistance of a metal as the temperature changes.
Termistori
These sensors use the temperature characteristics of semiconductor resistors, which change resistance as the temperature changes. Thermistors are sensitive and have high accuracy relative to their cost.

Negative temperature coefficient (NTC) termistori
These sensors are sensitive and can respond to very small temperature changes. They have a temperature range of -50 °C to 250 °C.

Resistive temperature detectors
These sensors have positive temperature coefficients (PTC) and offer precise temperature measurements. Tuttavia, they have poor sensitivity.

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1. Definition and working principle
‌Temperature probe‌:
Definition: A temperature probe is a device specifically used to measure temperature, and its core component is a temperature-sensitive element.
Working principle: A temperature probe uses sensitive elements (such as thermocouples, resistenze termiche, semiconduttori, ecc.) to convert temperature changes into electrical signals for subsequent circuit processing or display.

‌Temperature sensor‌:
Definition: A temperature sensor is a broader concept that includes a temperature probe and a signal processing circuit connected to it.
Working principle: A temperature sensor not only includes a sensitive element, but also has a signal processing circuit that can complete the acquisition, elaborazione ed emissione di segnali di temperatura, usually in the form of digital or analog signals.

2. Types and characteristics
‌Temperature probe type‌:
Sonda termocoppia: Utilizza l'effetto termoelettrico per misurare la temperatura, e ha le caratteristiche di un ampio intervallo di misurazione e di una rapida velocità di risposta.
Sonda di resistenza termica: utilizza la proprietà secondo cui la resistenza dei materiali metallici o semiconduttori cambia con la temperatura per misurare la temperatura, e ha le caratteristiche di elevata precisione di misurazione e buona stabilità.
Sonda a semiconduttore: utilizza la proprietà secondo cui la conduttività dei materiali semiconduttori cambia con la temperatura per misurare la temperatura, e ha le caratteristiche di piccola dimensione, leggero e basso consumo energetico.

‌Temperature sensor type‌:
Analog temperature sensor: outputs analog signals, which need to be converted into digital signals by analog-to-digital converters for subsequent processing.
Digital temperature sensor: directly outputs digital signals, has strong anti-interference ability, high accuracy, and is easy to integrate into the control system.
Intelligent temperature sensor: has self-diagnosis, autocalibrazione, communication and other functions, e può realizzare il monitoraggio e il controllo remoto.

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3. Selection and application
‌Selection factors‌:
Application environment: Considerare se l'ambiente misurato presenta condizioni speciali come la corrosività, alta temperatura, alta pressione, ecc., in modo da selezionare materiali e livelli di protezione adeguati.
Measurement range: Selezionare un sensore adatto in base all'intervallo della temperatura da misurare per garantire che il sensore possa misurare con precisione entro l'intervallo richiesto.
Accuracy requirements: According to the accuracy requirements of the application for temperature measurement, select a sensor with corresponding accuracy.
Cost budget: Under the premise of ensuring performance, consider cost factors and choose cost-effective sensors.

‌Application areas‌:
Industrial automation: used to monitor temperature changes in industrial equipment, machines and production processes to ensure normal operation of equipment and product quality.
Medical industry: used in medical equipment, temperature monitoring instruments and drug storage equipment to monitor patient temperature, ambient temperature and drug storage conditions.
Automotive industry: used in electric vehicle motors, capacitors, DC converters, charging systems, as well as automobile engines, gearboxes, air conditioning systems and exhaust systems to monitor and control the temperature of various liquids and gases.
Agriculture and food processing industry: used in agricultural greenhouses, cold storage, food processing equipment and transport vehicles to monitor and control the temperature of agricultural products and food.
Other fields: such as air conditioning and refrigeration industry, military and aerospace industry, Internet of Things industry, ecc. are also widely used.

IV. Use and maintenance
installazione: Install the sensor correctly according to the installation instructions to ensure good contact between the sensor and the object to be measured and avoid measurement errors caused by improper installation.
cablaggio: Collegare correttamente la linea del segnale e la linea di alimentazione del sensore per garantire la stabilità e l'accuratezza della trasmissione del segnale.
‌Calibrazione‌: Calibrare regolarmente il sensore per garantire che la precisione della misurazione soddisfi i requisiti dell'applicazione. The calibration process usually involves placing the sensor in a known temperature environment, comparing the difference between its output value and the standard value, and making necessary adjustments.
manutenzione: Pulire e manutenere regolarmente il sensore per evitare la polvere, sporco, ecc. that affect the measurement performance of the sensor. At the same time, pay attention to check whether the cable connection is loose or damaged, and replace damaged parts in time.

In summary, temperature probe sensors have a wide range of applications and an important position in the field of temperature measurement. When selecting and using them, it is necessary to make comprehensive considerations based on the specific application scenarios and requirements to ensure the accuracy and reliability of the measurement results. If you have any other questions or need further help, please feel free to let me know.