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Measuring density
Pressure units
Measuring density
07- 2016
Description and operation
SF
gas monitoring
6
D The international unit pressure is the Pascal (Pa).
D The practical unit is the bar (14.503 p.s.i.)
D Standard atmospheric pressure is equal to 101.3 kPa at sea level and an
air temperature of 20C (68F).
When it is not possible to directly measure density, this may be checked
using an industrial pressure gauge capable of measuring the effective
pressure.
An effective pressure value corresponds to the rated density, determined
for normal atmospheric pressure (101.3 kPa) and an ambient temperature
of 20C (68F).
For each pressure reading (filling, inspection of densimeter thresholds...), the
rated effective pressure should be corrected according to the ambient tem-
perature and atmospheric pressure of the site at the time the reading is taken.
See the module "Calculation of the SF
pressure gauge (tool)".
The real pressure is therefore :
P
= P
real
rated effective in accordance with temperature
ΔPp : correction in accordance with atmospheric pressure.
*
GE Information
1 bar = 1,000 hPa
1 bar = 100 kPa
10 bar = 1 MPa
gas filling pressure to using the
6
+ ΔPp
*
L20- 001EN/08
4/6
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