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Results tagged with rtd
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user 46661
Resistance Temperature Detector (RTD). An RTD sensing element usually consists of a metal filament, which is coiled on a mandrel or etched on a substrate. The RTD element is made from a pure material, typically platinum, nickel or copper. The material has a predictable change in resistance as the temperature changes; it is this predictable change that is used to determine temperature.
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RTD readout using wheatstone bridge and MCP6N11
The specifications are as follows:
temperature range: 50-250 Celsius
costs resonably low (< 10 US)
accuracy +/- 2 degrees
for cost and availability reasons I selected the following RTD: (farnell) … A proposed schematic can be found below (note that the RTD is placed between "R_uit" and "R_in").
There rests only one question. How do I properly set Vref? …
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Improving RTD Sensor filtering and readout
For cost reasons I have chosen for this RTD. The sensor is sampled by a 12 bit ADC of an Microcontroller. … The RTD is placed in an wheatstone bridge with a regulated 3.3v supply (looking at the supply with an scope I did not find much noise/ ripple). …
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