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- ºê·£µå À̸§: Zlinshow
- ¿ø»êÁö: Áß±¹
- Installation type: Immersion
- Item no.: QFM2160
- Sensor type: Temperature sensor
- Material: Plastic
- Application field: Electrical & electronics
- Model: QFM2160
- Precision: ¡¾0.4K
- Specifications: QFM2160
- Output type: Ni1000
- Encapsulation/shell: Plastic
- Operating temperature: 130
- Temperature measurement range: -30-130¡É
- Minimum number of packs: 1
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temperature and humidity sensor-selection method of temperature and humidity sensor
Thermocouple: thermocouple is the most commonly used temperature sensor in temperature measurement. Its main benefits are wide temperature range and adaptability to various atmospheric environments, and its firmness, low price and no power supply. The thermocouple consists of two different metal wire (metal A and metal B) connected at one end. When one end of the thermocouple is heated, there is A potential difference in the thermocouple circuit. The measured potential difference can be used to calculate the temperature. However, there is a nonlinear relationship between voltage and temperature. Because of the nonlinear relationship between voltage and temperature, it is necessary to make a second measurement for the reference temperature (Tref), and use the software or hardware of the test equipment to process the voltage-temperature transformation inside the instrument to finally obtain the thermocouple temperature (Tx). Agilent34970A and 34980A data collectors have built-in measurement computing capabilities. In short, thermocouple is the simplest and most common temperature sensor, but thermocouple is not suitable for high-precision measurement and application.
Thermistor: thermistor is a semiconductor material, most of which is a negative temperature coefficient, that is, the resistance decreases with the increase of temperature. Temperature changes will cause large resistance changes, so it is the most sensitive temperature sensor. However, the linearity of thermistor is extremely poor and has a great relationship with the production process. The manufacturer cannot give a standardized thermistor curve. Thermistor is very small in size and responds quickly to temperature changes. However, thermistor need to use a current source, and its small size also makes it extremely sensitive to autothermal errors. Thermistor is absolute temperature measured on two lines, which has good accuracy, but it is more expensive than thermocouple, and the measurable temperature range is also less than thermocouple. A commonly used thermistor has a resistance of 5k¥Ø at 25¡É, and every temperature change of 1¡É causes a resistance change of 200¥Ø. Note that the lead resistance of 10¥Ø only causes a negligible error of 0.05 ¡É. It is very suitable for current control applications that require fast and sensitive temperature measurement. Small size is beneficial for applications with space requirements, but attention must be paid to prevent self-heating errors.
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