Pressure Gauges: How They Work and How to Specify Them

Am I the only one to find this both uninformative and inaccurate?

Can you be more specific?

1. "The sensor must have two separate pressure ports; the higher of the two pressures is applied through the high port and the lower through the low port." OK
2. "Absolute pressure sensors measure the pressure of a system relative to a perfect vacuum. These sensors incorporate sensing elements which are completely evacuated and sealed; the high pressure port is not present and input pressure is applied through the low port." Contradicts (1); The vacuum reference should be on the low port and the pressure to be measured on the high port. Not OK.
3. "Sealed gauged sensors measure pressure relative to one atmosphere at sea level (14.7 PSI) regardless of local atmospheric pressure." Absolute pressure sensors also have a sealed element but measure pressure relative to a vacuum. Not OK.
4. "Most pressure gauges measure positive pressure in psi, and negative pressure is frequently measured in inches of Hg." Not in the least OK. I have worked with pressure gauges calibrated in bar, kg/cm2,even cmH2O.
5. "They [piezoelectric pressure sensors] are very rugged ... and are susceptible to shock and vibration." Well, are they rugged or are they not rugged?
I think that is enough to get on with, but it is also worth noting that the author has completely forgotten to mention the fluid-filled column (water or mercury) as a pressure measuring device.

Thanks php001 for your helpful comments! We'll pass these on to the author to help improve the article.

Seems rather thorough to me.

Thank you for the comments. We have taken down the article for review based on your input. I appreciate your taking time to post.