6″ Vertical Boiler. Calibrating the pressure gauge
I bought 2 pressure gauges at a recent Model Engineering Club auction night. I paid $AUD40 for the pair, although I was really only interested in the smaller one.
It was a bit of a gamble. Would they work? Accurate?
Stuart mentioned that he had an instrument for calibrating gauges, and he checked my gauges.
This gauge was item 51 at the auction. It is about 4″ diameter and has some style! Brass of course. The cream painted instrument with the shiny brass weights is the calibration gauge. It confirmed that my gauge was spot on at pressures of 50, 100, 150, 200 qnd 250psi.
The smaller gauge, 38mm 1.5″ diameter which I will use on the Trevithick dredger engine, was not quite as accurate, being 2.5psi out, but is adequate for use. It is also British made, brass, and nice appearance.