When selecting a thermistor, it is indeed necessary to comprehensively consider many key parameters and packaging (epoxy resin Encapsulation, Glass Bead Encapsulation, thin film Encapsulation, SMD Encapsulation, stainless steel probe sensor Encapsulation, injection molding coating). Let me tell you in detail:
The resistance range of thermistors is wide, and the resistance of NTC thermistors can range from tens of ohms to ten thousand ohms, and even special devices can be customized according to needs. Commonly used resistance values are 2.5Ω, 5Oh, 10Oh, etc., and common resistance errors are ±15%, ±20%, ±30%, etc.. The resistance range of PTC thermistors is usually from 1KΩ to hundreds of KΩ.
Reasonable arrangement of temperature sensors: The location and arrangement of temperature sensors will also affect the response time. If the contact area between the sensor and the object being measured is large, the heat exchange will be faster and the response time will naturally be shorter. No entanto, please note that too large a contact area may also lead to increased measurement errors, so we have to make a trade-off based on the actual situation.
As a component that can change the resistance value according to temperature changes, thermistors have a wide range of applications (such as temperature measurement, temperature control, temperature compensation, temperature alarm, battery thermal protection). Let me share with you several application cases of thermistors:
The connection method of the NTC thermistor temperature sensor needs to be determined according to the actual application scenario and measurement requirements. During the wiring process, be sure to pay attention to the pin polarity, wire selection, faixa de temperatura, filtering and decoupling, grounding treatment, and verification and calibration to ensure the accuracy and reliability of the measurement.
The main difference between a Pt100 and a Pt1000 sensor is their nominal resistance at 0°C, with a Pt100 having a resistance of 100 ohms and a Pt1000 having a resistance of 1000 ohms, meaning the Pt1000 has a significantly higher resistance, making it more suitable for applications where precise temperature measurement is needed with minimal influence from lead wire resistance, especially in 2-wire circuit configurations;
PT100, the full name of platinum thermal resistor, is a resistive temperature sensor made of platinum (Pt), and its resistance value changes with temperature. O 100 after PT means that its resistance value is 100 ohms at 0℃, and its resistance value is about 138.5 ohms at 100℃.
Este artigo explora 2-, 3-, e configurações de 4 fios para detectores de temperatura de resistência (IDT), focando em como os fatores ambientais, requisitos de precisão, custo, e a configuração do fio afetam a seleção. A configuração de 4 fios é complexa, mas oferece a mais alta precisão, enquanto a configuração de 2 fios tem vantagens em aplicações de menor precisão. A escolha de uma configuração requer uma combinação de requisitos de aplicação e condições práticas.
Um IDT (Detector de temperatura de resistência) é um sensor cuja resistência muda conforme sua temperatura muda. A resistência aumenta à medida que a temperatura do sensor aumenta. A relação resistência versus temperatura é bem conhecida e pode ser repetida ao longo do tempo.
A principal diferença entre um RTD e um Pt100 é o material usado para o elemento sensor: PT100 é um tipo específico de resistor térmico RTD, e seu nome vem de “Platina” (platina) e “100” (100 ohms a 0°C). É o sensor RTD mais comumente usado e é amplamente utilizado no controle de processos industriais, medição de laboratório e outros campos que exigem monitoramento de temperatura de alta precisão. As vantagens do PT100 incluem:
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