Assistance with a seemingly strange pirani gauge
I'm working on a vacuum system and so far things have gone unusually well for my projects and I really hope to keep doing well on it, but I'm hung up on the vacuum gauges. I've got a PR10-S Edwards Pirani gauge and the internal circuitry is strange. I can't find any literature on it anywhere or any schematics close enough to fudge. So I'm hoping I'blers might have a clue as to what is going on here.
Added a re-drawn circuit in an estimated configuration
After some googling, a 3-wire resistance thermometer
seems close to what I have as thats essentially what the gauge is, a clever application of a resistance thermometer.