actual pressure drop is displayed as delta P. If no temperature probe is
connected, you may also perform the tightness test without temperature
compensation.
Surface temperature probes (e.g. testo 115i) can also be used for the
temperature-compensated leakage testing, but must not be used to
measure surface temperature. They must be positioned as far as
possible to measure the air temperature. If a surface probe is used, in
the Settings menu of the testo 570s, the Auto Tfac (Temperature
compensation factor) must be switched off, see section 8.3.4.
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