Have installed this pressure gauge on my retic bore submersible pump. In the instructions it says for accuracy, after installation, to cut off the little rubber "tit" at top of gauge, presumably for some sort of pressure equalisation. They say the "tit" is sealed for transport which makes me a bit suspicious about leaking. As I have mounted it horizontally (and it would be hard to do otherwise), I dont want to cut it off if the internal liquid, which I think is glycerine for dampening purposes, is going to leak out. I did check when I bought it that it could be mounted horizontally, and the guy said I could mount it in any position, but the rubber bit wasn't mentioned, and after all, he is a reticulation guy, not a pressure gauge expert.
My question really is, does it make much difference, given it's location and purpose isn't exactly under laboratory conditions? I dont want to risk the fluid leaking out, but maybe it has a sort of internal diaphragm and won't leak anyway. And if it's likely to make less than 5% difference in the readings I would just as soon leave it intact.
Anyone got anything to add?
Hopefully you can see the "tit" at the "top" of the gauge in the photo. It is protruding from a grommet-like plug about 8mm dia. And BTW, the setup in the photo is only for testing, I have since replaced the outlet with 40mm pipe.