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Pressure gauges are protected from steam condensation in a regular boiler by using a siphon where steam condenses and prevents steam from going further up to the gauge.

However in a vacuum steam boiler when the boiler is re pressurized after use the pressure would push the water in the siphon up to the vacuum gauge.

I currently dont use any siphon and my vacuum gauges are far off (from condensation I guess) after a few boils, how can I prevent that ?

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  • $\begingroup$ Something like this? ultraeverdryonline.com.au $\endgroup$
    – Amir
    Commented Apr 9, 2016 at 11:41
  • $\begingroup$ condensation has a mysterious way of messing up the bourdon tubes of pressure gauge. These tubes are made of metal already, so it's not a matter of surface tension/wetting I believe $\endgroup$
    – Manu de Hanoi
    Commented Apr 10, 2016 at 15:39

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Have you tried a gauge guard? It's a simple diaphragm that allows pressure to transmit, without the liquid crossing the barrier.

enter image description here

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