एक आरटीडी (प्रतिरोध तापमान डिटेक्टर) एक सेंसर है जिसका तापमान बदलते ही प्रतिरोध बदल जाता है. सेंसर का तापमान बढ़ने पर प्रतिरोध बढ़ता है. प्रतिरोध बनाम तापमान संबंध सर्वविदित है और समय के साथ दोहराया जा सकता है.
आरटीडी और पीटी100 के बीच मुख्य अंतर सेंसिंग तत्व के लिए उपयोग की जाने वाली सामग्री है: PT100 एक विशिष्ट प्रकार का RTD थर्मल रेसिस्टर है, और इसका नाम आता है “प्लैटिनम” (प्लैटिनम) और “100” (100 0°C पर ओम). यह सबसे अधिक इस्तेमाल किया जाने वाला आरटीडी सेंसर है और इसका व्यापक रूप से औद्योगिक प्रक्रिया नियंत्रण में उपयोग किया जाता है, प्रयोगशाला माप और अन्य क्षेत्र जिन्हें उच्च परिशुद्धता तापमान निगरानी की आवश्यकता होती है. PT100 के फायदों में शामिल हैं:
The thermal resistance formula is in the form of Rt=Ro(1+A*t+B*t*t);Rt=Ro[1+A*t+B*t*t+C(t-100)*t*t*t], t represents Celsius temperature, Ro is the resistance value at zero degrees Celsius, ए, बी, C are all specified coefficients, for Pt100, Ro is equal to 100℃.
A PT100 sensor acquires temperature by measuring the change in its electrical resistance, which directly correlates to the temperature it is exposed to; as the temperature increases, the resistance of the platinum element within the sensor also increases, allowing for a precise calculation of the temperature based on this resistance change; essentially, the “100” in PT100 signifies that the sensor has a resistance of 100 0°C पर ओम, and this value changes predictably with temperature fluctuations.
Platinum resistors are widely used in the medium temperature range (-200～650℃). वर्तमान में, there are standard temperature measuring thermal resistors made of metal platinum on the market, जैसे पीटी100, Pt500, पीटी1000, वगैरह.
The temperature measurement range of the commonly used platinum resistance Pt100 sensor probes is -200～850℃, and the temperature measurement ranges of Pt500, Pt1000 sensor probes, वगैरह. are successively reduced. पीटी1000, temperature measurement range is -200～420℃. According to the IEC751 international standard, the temperature characteristics of the platinum resistor Pt1000 meet the following requirements:
The DS18B20 sensor communicates using the “1-तार” protocol, which means it uses a single data line for all communication with a microcontroller, allowing multiple sensors to be connected on the same line and identified by their unique 64-bit serial code; this single data line is pulled high with a resistor and the sensor transmits data by pulling the line low during specific time slots to send bits of information.
This article explains in detail the application of custom DS18B20 digital temperature sensor in building a digital thermometer. Including working principle, hardware connection, software programming and simulation implementation. Provide complete protues simulation diagram, C source code and result analysis to help readers deeply understand and practice the use of DS18B20.
What are thermistors NTC and PTC?
NTC and PTC are both thermistors, which are special resistors that can change resistance with temperature. They can also be said to be a kind of sensor.
Q: Can you explain sensitivity resolution in more detail? Why are higher values better?
ए: High sensitivity eliminates any lead resistance. It also simplifies the supporting electronics. ए 10,000 ohm thermistor changes resistance by 4.4% या 440 ohms for a 1°C change in temperature. ए 100 ohm platinum sensor changes resistance by 1/3 ohm for a 1°C change in temperature.
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