It seems like the Gas Pipe Thermo Sensor and Liquid Pipe Thermo Sensor have different default states for when the gas and liquid pipes are empty.
I would also be expecting them to be "triggerable" even when empty by changing the settings (they seem to be reading absolute zero at -273.2 *C, so I would expect setting them both to "Below 100*C" or even "Below *0" would turn the automation on). But, this might be by design, even if it is giving me trouble. I was just expecting them to be triggerable since you can trigger an atmo sensor in vacuum and the hydro sensor outside of liquid. Just realized you can't realize a plain thermo sensor in vacuum at all.
However, the Gas Pipe Thermo Sensor gives the "true" signal always when the pipe is empty, and the Liquid Pipe Thermo Sensor always gives a "false" (which is a slight horror as I might need to go and break into that carefully closed off water-filled room...). There is nothing in their description that might hint that they are inconsistent or have an the opposite behaviour. And, to make things better, the overtext on the Liquid and Gas Pipe sensors is at least correct, reading "Active" for Gas and "Inactive" for liquid. The regular thermo sensor in vacuum reads "Active" and gives out a "false" signal
Empty pipes, liquid pipe sensor on the left is returning false, gas pipe sensor on the right is returning true:
Empty liquid pipe (it's the radiant one with the sensor attached):
Empty gas pipe (again, the radiant one with no outoupt hooked as of yet):
"Active" Thermo sensor in vacuum giving out a "false" signal:
Build a Thermo sensor in vacuum, Liquid and Gas Pipe Thermo Sensor through empty pipes of the correct type, observe automation outputs.
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