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aha, thankyou for the insight, I will try to perform some measurements this afternoon/evening. That would make sense acting as a double function. 1. to know if the connector is connected and 2. it would indicate that when freezing temperatures are present the wind sensor input should not be considered valid.
Math is the foundation of the simulation. The simulation is just doing the math for you. Understanding the math gives you insight on how and to what degree the component values and operational parameters influence the behavior of the circuit.
for power supply, initially looks like this could work, but perhaps instead of disconnecting you may just want to limit the overvoltage to your max voltage?
For simple connection/disconnection I would use a relay, or an analog mux. These are ofcourse slow response devices and if you need to protect from short pulses, I would add infront of that some TVS (Transient Voltage Suppression) diodes, zeners, MOV (Metal Oxide Varistors),,.... protective elements to absorb the extra voltage/energy untill the relay disconnects the signal.
Its not that mosfets that are incompatible with opamps, depending on what you want to achieve it may be the ideal component. But this circuit along with what you describe you want to do does not seem to be the correct solution. This circuit introduces quite a few non-linearities into what would be your signal chain. As power supply management, this circuit can be useful, but in a signal processing path I would not recommend it.
