For new owners, this is a very common question – Why is there an air bubble in my Rainman Pressure Guage? Is it supposed to be there?
First of all, as a Rainman Watermaker owner and Seatask customer, you always have access to our expertise for any questions during the operation of your system – we are always happy to help, and may even have a fact sheet like this one to show you.
So, the air bubble – is it normal? …. Short answer… Yes, Certainly is
The air bubble in the gauge is actually intentional – and in fact, is necessary for the gauge to operate correctly.
The Oil is effectively dampening the internal pressure to ensure accurate readings -and effectively having a cushioning effect on the gauge needle.
The air bubble ensures that the oil has some slight expansion as the gauge heats and cools. Â The air is compressible, so can be squeezed by slightly expanding oil. Â Otherwise the oil would force its way out of the gauge.
Which is good news for your gauge!