Hi all,
i want to know about PT100 temparature sensor, can i get current output from this sensor 4-20mA. i want to measure temparature 0 to 50 deg C, i want to do this with one ADC and microcontroller
hi,
One option would be to make up a quarter bridge, 3 elements using precision resistors and the PT100 as the fourth arm of the bridge.
Use a AD623 OPA amplifier, output to your MCU.
OK.?
EDIT:
This image shows one option.
Note the 3, OPA's are all in the same AD623, 8 pin DIP package
a resistive output needs a resistive network (Like a voltage divider) or like the one good old Sir Eric showed. An LM35 gives out voltage output, you can either wire it up directly to the uC or amplify it using op-amps.
a resistive output needs a resistive network (Like a voltage divider) or like the one good old Sir Eric showed. An LM35 gives out voltage output, you can either wire it up directly to the uC or amplify it using op-amps.
hi,
The accuracy of the LM35 is about +/-0.25Cdeg from +2Cdeg thru about 50C.
The LM35 can used from -55C thru +150C.
The LM335 is good choice for temperatures below 0C.