Parker ServiceJunior Test-Kit Manual Del Usuario página 32

Design and Function
Pressure Fluctuations
The pressure is not constant at the start of the pressure measurement. Following each
pressure change in the measuring set-up, it takes a few minutes for the pressure to stabi-
lise.
Pressure fluctuations are influenced by the following factors:
Poor venting
Mechanical properties of the
pressure hose
Temperature
Settling times of ServiceJun-
ior and test object
10
If there is any air in the measuring set-up, it takes much
longer to generate pressure.
If the pressure hose is rolled up or bent, the volume
in the pressure hose changes. Volume changes in the
pressure hose lead to a pressure increase.
In the case of high pressures, the pressure hose
expands. Expansion of the pressure hose leads to a
pressure decrease.
A change in the ambient temperature causes a change
in the volume in the measuring set-up and, thus, to a
change in pressure. The lower the pressure in the meas-
uring set-up, the greater the pressure changes.
The settling times of the ServiceJunior and test object
could be different. In this case, read the operating manu-
als provided with the two devices.
V2.0/07/20