[Instrumentation Interview Question] Pressure measurement

Pressure is defined as force per unit area. Pressure above atmospheric is mostly measured in pounds per square inch (PSI), or in kilo gram per square centimeter (kg/cm2) gauge or absolute. For lower pressure (below about 10 psi), inches or cms. of water or mercury column are frequently used. For near atmospheric pressure, we refer more commonly to millimeters of mercury column (or torr).

The SI unit of pressure is Newton per square meter, or PASCAL (Pa). One atmospheric pressure (atm) is equal to 101325 Pa or 101.325 Kpa. More recently, bar is also being used for higher ranges. A bar is 0.987 atm, or approximately 14.5 PSI. A conversion table for more commonly used pressure units is given here.

Pressure Conversion Table:
From                atmospheric     Psi                   Bar                  mmHg (torr):
Atmospheric    1.000               14.696             1.0133             760.00
(1.033 kg/cm2)
Psi                   0.068               1.000               0.0689             51.50
Bar                  0.987               14.504             1.000               750.06
Kg/sq.cm         0.9678             14.223             0.9807             735.56
MmHg(torr)    0.0013             0.019               0.013               1.00
Mm(WC)         0.0001             0.0014             0.0001             0.0736HgHJH

Share on Google Plus

About denizen robo

This is a short description in the author block about the author. You edit it by entering text in the "Biographical Info" field in the user admin panel.
    Blogger Comment
    Facebook Comment

2 comments:

  1. This comment has been removed by a blog administrator.

    ReplyDelete
  2. There are different types of pressure measuring devices are there like Bourdon Tubes, McLeod Guages, Bellows, Diaphragms, Manometers, Barometers etc.

    ReplyDelete