5 INSTALLATION
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5.4.2 Master installation
1) Normally, the master should be either of the followings:
•
A known non-leaking part
Choose a non-leaking part.
If the part has fluctuation due to the pressurization such as deformation, it cannot be used as a
master.
•
A Master Chamber (sold separately)
Various Master Chambers are available depending on the internal volume of the tested part. If
Master-Preset compensation is used, Cosmo recommends MC-F02A (200c) that is excellent in
thermal stability and compatible with broad range of internal volume from small to large.
2) Advantages of using a Master Chamber
•
Capable of fast temperature stability, which derives excellent pressure stability and repeatability for
long term or period.
•
Inexpensive
•
Compact and space saving.
3) Location of master
•
Install the master where there will be minimal effects due to vibration from motors, heat, wind from
fans, air conditioning of heating vents. In cases where these situations cannot be avoided, use a
curtain or screen. However, it is not good to cover the whole test stand area completely because
of temperature fluctuations that could occur in the master. Therefore, partial covering will give
better results.
•
Because the floor changes its temperature very rapidly, avoid installing the master close to the
floor.
•
Use of an intermediate insulator, such as rubber sheet is recommended to avoid heat transfer from
the mounting surface to the master.