BUSCH VACTEST TPP 900 - Operation; Before Operation; Select Operating Mode

Operation | 5
Instruction Manual VACTEST TPP900_EN_en 9 / 24
5 Operation
NOTICE
Aggressive media such as fluorides, halogenides, carbon, oxygen plasma and all other
corrosive media.
Reduce sensor life-time!
• Furthermore, dust, oil or condensing vapours will affect sensor performance and may
cause malfunction.
5.1 Before Operation
Dependence On Gas Type
The measured pressure will depend on composition and type of gas. The gauge is factory
calibrated for N
2
and dry air.
To adjust to other gases, a suitable correction factor for the Pirani sensor can be set in
the gauge for the pressure range below 15 mbar, see Adjust Gas Correction Factor
[►15].
5.2 Select Operating Mode
Short-Term Operation "Auto-Off" mode
• Press “Mode” key
MODE
mbar
The current pressure is displayed.
The gauge will automatically shut down after 20 seconds.
Continuous Operation "Cont" mode
Notes: Available only when data recorder function is disabled.
MODE
mbar
The current pressure is displayed.
MODE
mbar
If the “Cont" mode is activated, the gauge
is in continuous operation until it is
switched off manually or, after the maxi-
mum operation time is reached.