I apologize for my snippy tone--long frustrating day.
So, the voltage drop is on the output of the sensor? You might check the 24V power supply and make sure it's actually putting out ~24V. I suspect that it is, as there are several other components that run from it. The slow degradation of the output is strange, and I can't think of what might cause it other than the PS itself--but it's early and I haven't finished my coffee yet.
Have you added any other components to the 24V control circuit? If you have another solenoid or relay in parallel with the air solenoid, and it has a lower resistance then the air valve, it could be siphoning off enough power to do what you describe.
So, the voltage drop is on the output of the sensor? You might check the 24V power supply and make sure it's actually putting out ~24V. I suspect that it is, as there are several other components that run from it. The slow degradation of the output is strange, and I can't think of what might cause it other than the PS itself--but it's early and I haven't finished my coffee yet.
Have you added any other components to the 24V control circuit? If you have another solenoid or relay in parallel with the air solenoid, and it has a lower resistance then the air valve, it could be siphoning off enough power to do what you describe.
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