MorganS:
Yes, that is possible. But then you no longer get any data from the sensor. The Arduino is loading it down to 2.2V and you cannot possibly know if the sensor has changed from 2.5 to some other value.Now there may be some ways which this is useful - for example, you never want to see any value greater than 2.2V so you can brick-wall it at that value, allowing any lesser voltage to pass through unmolested.
The thing is, it's not just a sensor. It's a delicate sensor which produces a signal in the microvolt range plus an amplifier which brings it up to the volt range. That amplifier will have feedback. That means that if its output is not at the right voltage, it will apply more power to bring it up. You can load it down by exceeding the power available to that amplifier. And that is the point where you're no longer reading the sensor, you're just applying the voltage that you want to that wire, using your more powerful amplifier.
You could add another sensor and use that output to overload the original sensor but I suspect if your goal is not cutting wires, then bolting a new sensor on is not in the picture.
Wow thank you very much! You went deep. That's what I was thinking. I'm very close to giving up.