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Pressure Balance
GB
CPB 3000
WIKA Operating Instructions Pressure Balance Version 1.1
15
3.2 Operation
.
3.2.1 Weight Pieces
.
First of all put the bell onto the piston/cylinder system.
Stack the weight pieces onto the bell depending on the pressure value that is required.
It is usually best to start with the heaviest weight so that the centre of gravity is as low as possible.
Each component is identified by a consecutive number. In the calibration certificate to each number
the resultant pressure assuming reference conditions is listed.
Example table from a calibration certificate page 2:
Druckwerte der Gewichtsstücke / Pressure values of masses
Bezeichnung des
Gewichtsstückes
type of weight piece
Nr.
no.
wahre Masse
true mass
in kg
Druckwert
für System
pressure value
for system
in bar
Kolben /
piston
1262
0.08160
0.4002
Glocke /
bell
1 0.81560 3.9998
Teller /
plate
2 0.05097 0.2499
Masse /
weight piece
3 1.01954 5.0000
Masse /
weight piece
4 1.01954 5.0000
Masse /
weight piece
5 1.01954 5.0000
Masse /
weight piece
6 1.01954 5.0000
Masse /
weight piece
7 1.01954 5.0000
Masse /
weight piece
8 1.01954 5.0000
Masse /
weight piece
9 1.01954 5.0000
Masse /
weight piece
10 1.01953 5.0000
Masse /
weight piece
11 1.01952 4.9999
Masse /
weight piece
12 0.50976 2.5000
Masse /
weight piece
13 0.20391 1.0000
Masse /
weight piece
14 0.20391 1.0000
Masse /
weight piece
15 0.12234 0.6000
Masse /
weight piece
16 0.10196 0.5000
Masse /
weight piece
17 0.07137 0.3500
Masse /
weight piece
18 0.05098 0.2500
Example: weight piece no. 5 generates a pressure value of 5.0000 bar
with its weight value of 1.01954 kg assuming reference
conditions (room temperature 20°C, air pressure1013 mbar,
relative humidity 40 %)
The pressure that will be achieved thus corresponds to the sum of the basic weight (piston), the
bell and the weight rings.
To reduce the starting value, the weight plate (No. 2) can be used as the basic holding surface
instead of the bell (No. 1).