In particularly harsh processes, it can be advisable to instal protection features to extend the gauge life spans. The three main types of protection are;
Filters – available as mesh and sintered metal, these help to stop particle contamination from reaching the gauge.
Baffles – when measuring to lower pressures, filters would too heavily influence the vacuum pressure reading, therefore use of baffles to break line of site to the process (where putting the gauge on an elbow is not possible) helps to stop evolved material from contaminating the gauge.
Finally, spiral tubes can be fitted between the gauge and the system to stop certain gas types condensing in the gauge. Instead they condense in the colder tube and will fall back into the pipework to be extracted by the pump.