3 Description of the instrument
9
3 Description of the instrument
3.1 Use
The testo 552 is a digital vacuum gauge for the precise measurement of
extremely small pressures in the vacuum range. This allows you to monitor the
evacuation (usually during commissioning) of refrigeration systems and heat
pumps.
With the testo 552, you can therefore measure the current pressure in a
refrigeration system, and thus gather information about the degree of
dehumidification and the removal of foreign matter (oils, foreign gases, etc.).
A vacuum gauge is always used in conjunction with a vacuum pump (generates
the vacuum). A manifold (analogue or digital) is also often used in order to
obtain controlled access to the refrigeration system.
3.2 Instrument overview
Element Function
1 MiniDIN probe socket Cable connection for connecting to the testo
570.
2 Display Displays instrument status icons, measuring
units and measuring values.
3 Control keys Instrument operation.
4 Connections 7/16"
UNF, brass
Connection of refrigerant hoses, vacuum pump,
manifolds, etc..
5 Hook Suspension device
6 Battery compartment Contains two AA batteries.
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