Description and operation
SF
6
gas monitoring
GE Information07- 2016 L20- 001EN/08
4/6
Measuring density
Pressure units
D The international unit pressure is the Pascal (Pa).
D The practical unit is the bar (14.503 p.s.i.)
1 bar = 1,000 hPa
1 bar = 100 kPa
10 bar = 1 MPa
D Standard atmospheric pressure is equal to 101.3 kPa at sea level and an
air temperature of 20C(68F).
Measuring density
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
6
gas filling pressure to using the
pressure gauge (tool)”.
The real pressure is therefore :
P
real
= P
rated effective in accordance with temperature
+ ΔPp
*
*
ΔPp : correction in accordance with atmospheric pressure.
To Next Page
Loading...
Need help?
General
