Weather station issue
SolvedMPMP10 Posted messages 47240 Registration date Status Member Last intervention -
Hello,
We bought 2 weather stations of the same model for our house, one in a bedroom and one in the living room, with both external sensors placed in the same location. The price was about 70 euros. The problem is that the temperatures from the sensors show a difference of 1.5 degrees from each other even though they are in the same place.
I fear there may be nothing we can do, but CCM has often found solutions for me, so I’m giving it a try anyway.
Thank you in advance, and perhaps see you soon.
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2 answers
Hello
It’s like scales, a precision of 10g with digital display, but at €70, don’t kid yourself, in reality, scales aren’t necessarily more accurate than those mechanical scales of the past! And those 1.5° variations are very common once you move to industrial manufacturing in weather stations, it has to be said even if in hospitals we will find calibrated thermometers, not for that. Everything is sealed, we no longer modify a resistor like before, we’re sold disposable products 99% of the time.
It’s more reliable than before, more precise nonetheless, not all models simply allow recalibration, or not at all. Calibrated, it’s 100 times more expensive and has to be redone every year, it’s a permanent maintenance cost. Often, the actual precision of the delivered device, the number on the right is useless, that’s the reality, sometimes the precision is a few units of the second digit from the right.
However, we rarely place 2 sensors from 2 independent weather stations side by side, and on the same station, 2 separate sensors can show one of them an average temperature, or stabilized to avoid flickering and reduce the number of calculations that significantly impact the overall cost.
Once compared to local weather, the discrepancies can remain constant, but a little more wind or the shadow of a leaf on one can vary the reading; you also have to wait for the temperatures of the materials around the sensors to stabilize and the influence of hands that have handled and warmed the sensor and its wire.
For 2 transistors to display the same temperature, we often have to attach them to the same radiator, often attach the potential resistor or other compensation component to the same radiator, then adjust the two measurement circuits to show the same reading, if that adjustment was planned.
This is not calibration yet.
If we have access to the program and it allows for everything to be adjusted through programming, it’s not impossible; it’s done in home automation.
Thank you, I see, I understand that we can't ask for the moon at this price.
Have a good afternoon
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You're welcome and have a good rest of the afternoon to you too.