Pin configuration
pt100 datasheet :the pt100 sensor is similar to a variable resistor, whose resistance varies with appreciate to the surroundings temperature. There are many kinds of pt100 sensors, the only we use here is a twine one.
Pin wide variety
pin name
description
1
pin 1
one quit of the variable resistor
2
pin 2
other cease of variable resistor
capabilities
platinum resistant thermometer (prt)
temperature variety: -two hundred°c to 850°c
resistance variety: 1. 849k to 39. 026k
accuracy: ±zero. 1°c
nominal resistance: 100Ω at 0°c
notice: whole technical information may be found at the pt100 sensor datasheet given on the stop of this web page. Opportunity prts
pt100 (3-cord), pt100 (four-wire), pt500, pt1000
alternative temperature sensors
lm35, dht11, dht22, thermocouple, tmp100, lm75, ds18820, sht15, lm35dz, tpa81, d6t
wherein to use the pt100 sensor? The pt100 is a generally used as business temperature sensor. It is regarded for its capability to degree excessive range temperature (200°c) with an accuracy of zero. 1°c. The constriction of the sensor is also easy and consequently it can be used in rugged environments. One drawback of this sensor is that it’ll no longer exercise session of the box. To get beneficial values of temperature one must use it together with a capacity divider or a wheatstone bridge.
However due to the fact those sensors just work with variable voltage it is very easy to apply them in projects. So in case you are looking for a sensor with accurate variety and decent accuracy that’s notably reasonably-priced then pt100 might be a brilliant desire. A way to use pt100 sensor? The pt100 sensor falls below the category of prts (platinum resistant thermometers).
These sensors are nothing however a variable resistor which modifications its resistance based totally at the temperature around it. So we need to construct a small circuitry to degree the voltage throughout it. This circuitry may be as easy as a capacity divider or as complex as a wheatstone bridge with instrumentation amplifier. The layout of the circuit depends on the accuracy wanted for the mission. Additionally there are many styles of pt100, the one that we’re discussing right here is cord sensors, and there also are sensors with three-wires and even 4-wires. So that you could preserve matters simple let’s speak the way to interface a 2-wire sensor to a mcu using a easy capability divider circuit.
pt100 datasheet with microcontroller: circuit diagram
the pt100 datasheet that we’re designing for has a variable resistance from 1. 8k to 39. 02k as stated in the functions above. So we should convert this variable resistance price to a voltage price of 0v to 5v so that out microcontroller can recognize it (right here i’m the use of a 5v mcu). To do this we’ve used a simple capability divider, in keeping with the voltage divider calculator whilst the value of input voltage is 5v and r1 is 5. 1k and the pt100 resistance is 1. 8k (minimal) we will get an output voltage of 1. 304v and whilst the price of pt100 is 39. 02k (maximum) we will get an output voltage of 4. 42. Both the output voltages are in range for the microcontrollers adc pin to read so we will continue with the circuit.
However for a circuit of this kind the accuracy will be very much less, in case you require extra accuracy you may dig deep into wheatstone bridge and amplifiers. Even as calculating the cost of resistance we additionally should consider the resistance of the wire, once the resistance fee of the cord is thought it’ll compensated with the real fee. Greater details on this will be found in datasheet under. As soon as the cost of resistance you could equate it to the price of temperature by the usage of the underneath table-
pt100 resistance to temperature values
packages
measure high variety temperatures
rugged in production therefore can be used in harsh environments
measure duct temperatures
can measure a huge range of temperature with respectable accuracy
2nd – model