Pressure gauges are never connected directly to the live steam line; rather a loop or syphon is interposed as close as possible to the pressure gauge. This is done to

• A. avoid the overheating of the tubes & bellows which operate them to minimise error and damage.
• B. form a seal of water by steam condensate to fill the tube or bellows at the pressure being measured.
• C. both 'a' & 'b'.
• D. avoid the static head error introduced by steam entry.