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Temperature (Piston/Cylinder); Ambient Conditions - WIKA CPB5000HP Betriebsanleitung

Höchstdruck kolbenmanometer
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Pressure Balance High-Pressure
CPB5000HP

2.3.2 Temperature (Piston/Cylinder)

The effective cross-sectional surface of the piston/cylinder system depends on the temperature.
The effect depends on the material used and is described by the temperature coefficient (TK).
In the event of deviations from standard reference conditions (typically 20 °C), the following formula
must be used to make a correction:
True
pressure
Nominal
Example:
Reference temperature: 20 °C
Temperature during use: 23 °C
TK: 0.0022 %
True
pressure
100
Without the correction, measurements would all be "off" by 0.007 %.

2.3.3 Ambient conditions

The effects of ambient conditions
 air pressure
 room temperature
 relative humidity
should always be taken into consideration if the highest level of accuracy is required.
Fluctuations in ambient conditions change air density.
The air density affects the pressure through the buoyancy of the weights:
Weight
Nominal
weight
The air density is typically 1.2 kg/m
The density of the weights (non-magnetic steel) is 7,900 kg/m
A fluctuation of 5 % in the relative humidity causes an additional uncertainty in the measurement of
about 0.001 %.
WIKA Operating Instructions Pressure Balance High-Pressure Version 2.5
value
1
t
Appl
1
bar
1
23
20
2
2 .
Air
density
 
1
Weight
density
3
1
t
TK
Re
ference
99
.
99340
bar
5
 
3
GB
.
.
9

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