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====== Analog sensors ======
Generally speaking, analog sensors utilize changes of **voltage**, **current** or **resistance** on output terminals. The sensors can be divided into two groups:
  * __Active__ -> the output signal towards the GND is either voltage or current (most active sensors are powered by an external power source galvanically isolated from the unit)
  * __Passive__ -> the resistance between the output terminals changes depending on the measured parameter.

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On the Unipi e-shop, you can find **reliable passive** analog sensors suitable for use in heating, air conditioning, industrial environment etc. These sensors are also a good choice for projects requiring the most precise and reliable sensors available.

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Most active sensors are designed for special use and can be purchased from specialized vendors.
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===== Temperature resistance sensors =====

==== PTS 350B ====
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==== PTS 310A ====
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==== PTS 320 ====
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