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. The 100 after PT means that its resistance value is 100 ohms at 0℃, and its resistance value is about 138.5 ohms at 100℃.
This article explores 2-, 3-, and 4-wire configurations for resistance temperature detectors (RTD), focusing on how environmental factors, accuracy requirements, cost, and wire configuration affect selection. The 4-wire configuration is complex but offers the highest accuracy, while the 2-wire configuration has advantages in lower-accuracy applications. Choosing a configuration requires a combination of application requirements and practical conditions.
An RTD (Resistance Temperature Detector) is a sensor whose resistance changes as its temperature changes. The resistance increases as the temperature of the sensor increases. The resistance vs temperature relationship is well known and is repeatable over time.
The main difference between an RTD and a Pt100 is the material used for the sensing element: PT100 is a specific type of RTD thermal resistor, and its name comes from “Platinum” (platinum) in “100” (100 ohmov pri 0°C). It is the most commonly used RTD sensor and is widely used in industrial process control, laboratory measurement and other fields that require high-precision temperature monitoring. The advantages of PT100 include:
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, A, B, C are all specified coefficients, for Pt100, Ro is equal to 100℃.
Senzor PT100 pridobi temperaturo z merjenjem spremembe njegovega električnega upora, kar je neposredno povezano s temperaturo, ki ji je izpostavljen; ko se temperatura poveča, poveča se tudi odpornost platinskega elementa v senzorju, kar omogoča natančen izračun temperature na podlagi te spremembe upora; v bistvu, the “100” v PT100 pomeni, da ima senzor upor 100 ohmov pri 0°C, in ta vrednost se predvidljivo spreminja s temperaturnimi nihanji.
Platinasti upori se pogosto uporabljajo v srednjem temperaturnem območju (-200~650 ℃). Trenutno, na trgu so standardni toplotni upori za merjenje temperature iz kovinske platine, kot je Pt100, Pt500, Pt1000, itd.
Območje merjenja temperature običajno uporabljenih senzorskih sond iz platinske odpornosti Pt100 je -200～850 ℃, in temperaturna merilna območja Pt500, Senzorske sonde Pt1000, itd. se zaporedno zmanjšujejo. Pt1000, temperaturno merilno območje je -200 ~ 420 ℃. V skladu z mednarodnim standardom IEC751, temperaturne značilnosti platinastega upora Pt1000 izpolnjujejo naslednje zahteve:
Senzor DS18B20 komunicira z uporabo “1-Žica” protokol, kar pomeni, da uporablja eno samo podatkovno linijo za vso komunikacijo z mikrokrmilnikom, omogoča povezavo več senzorjev na isto linijo in identifikacijo z njihovo edinstveno 64-bitno serijsko kodo; ta posamezna podatkovna linija je povlečena visoko z uporom in senzor prenaša podatke tako, da potegne črto nizko v določenih časovnih intervalih za pošiljanje bitov informacij.
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