User Manual

7 Maintaining the product
19
Evacuation / vacuum display
5. Connect Vakuum probe.
Vacuum measurement
✓ The vacuum probe is plugged into the front connection of the
manifold and connected to the system.
1.
[Mode] 2 x press.
- The vacuum measurement menu appears. If ambient pressure
is applied to the vacuum probe, then
oooo is shown on the
display.
2. Start the vacuum pump.
- Once the measuring range 0 to 20,000 microns is reached, the
current vacuum value is shown on the instrument display. The
instrument also displays the current ambient temperature, the
water evaporation temperature, which corresponds to the
vacuum reading, and the delta between these two
temperatures.
3. To leave vacuum mode, remove the vacuum probe from the
testo 557 or switch to the standard measurement view using the
mode button.
7 Maintaining the product
Cleaning the instrument
Do not use any aggressive cleaning agents or solvents!
Mild household cleaning agents and soap suds may be
used.
> If the housing of the instrument is dirty, clean it with a damp
cloth.
Keeping connections clean
> Keep screw connections clean and free of grease and other
deposits, clean with a moist cloth as required.
Removing oil residues
> Carefully blow out oil residues in valve block using compressed
air.
Ensuring the measuring accuracy
Testo Customer Service would be glad to further assist you if you
so wish.