This time around is a bit of vintage tech: a thermocouple vacuum gauge. The part seen above, and represented in the schematic, is the sensor side of things. ... (20-30 years, in my case).

However, a typical Pirani gauge however tends to go down to 0.1 Pa. Still a bit lack luster as far as “high vacuum” gauges go, since high vacuum starts at 1 Pa and goes down to about 1 µPa.

IT is known that the range of a hot-wire vacuum gauge may be extended to 10 mm. mercury pressure or above, if by some means the current supplied to the wire is increased with increasing pressure1,2.