TESTO 557 - Page 19

6 Using the manifold
19
With both NTC temperature probes connected, Δt is also shown.
> Press [Mean/Min/Max]: to display min. / max. readings and
mean values.
Leak test / pressure drop test
The temperature compensated leak test can be used to
check the leak tightness of systems. For this purpose both
the system pressure and the ambient temperature are
measured over a defined period of time. For this purpose
a temperature sensor to measure the ambient temperature
may be connected (recommendation: Deactivate the
surface compensation factor (see page 14
) and use NTC
air sensors Art.-No. 0613 1712). This provides information
about the temperature compensated differential pressure
and about the temperature at the beginning/end of the test
as a result. If no temperature sensor is connected, you may
also perform the leak test without temperature
compensation.
✓ The actions described in the chapter “Preparing for
measurement” have been performed.
1. Press [Mode]
- The leak test view is opened. ΔP is displayed.
2. Start the leak test: Press [R, ►, ■].
3. End the leak test: Press [R, ►, ■].
- The result is displayed.
4. Confirm the message: Press [Mode].
- Main menu display.
Changeable
-
Evaporation
Temperature (Ev)
-
Measured
Temperature (T1)
-
Superheating (SH)
Changeable
-
Condensation
Temperature (Co)
-
Measured
Temperature (T2)
-
Subcooling (SC)
Condensation
pressure
Evaporation
pressure