I made some research about that and read few articles based on scientific experiments... there is a common conclusion in all, i found the following to be the clearest(source New Approach for Airflow Measurement Using Thermal Resistance Simulation | Umar | KnE Engineering) : There is a variety of airflow sensors on the market which meet specific application especially for commercial and private purpose [1]. The ceramic PTC thermistor is considered as an ideal sensor for monitoring the airflow and has several advantages such as simple structure and rugged. For long-time application, the sensor has disadvantages due to their longterm stability and soiling on its surface, so that it has to be recalibrated.
Positive temperature coefficient (PTC) thermistor sensors are constructed from sintered metal oxide ceramic and its electrical resistance change with temperature. They are sensitive but highly non linear. Their sensitivity, reliability, ruggedness and ease in use, have made them popular for research applications but less commonly used for industrial applications. Furthermore, the raw signal from the thermistor is extremely non-linier [2].
other issue is the response time which is better with the hot wire than with the PTC thermistor so even if it works IMO the ''original'' design is better provided it's genuine LR sensor not OEM VDO or other aftermarket cos those can be all the same lottery regardless of the construction mode... my D2 is Eu2 so for me it's not so important but if i had a Eu3 i'd certainly use a genuine LR one...but that's just me.
Discovery Td5 (2000), manual, tuned
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