TESTO 550 - Tightness and Pressure Drop Tests

6 Using the product
15
- Reading and display illumination flash:
• 1 bar before reaching the critical pressure of the refrigerant,
• upon exceeding the max. permissible pressure of 50 bar.
Key functions
> [▲]
or [▼]: Change the reading display.
Possible display combinations:
Evaporation pressure
Refrigerant evaporation
temperature to/Ev
Condensation pressure
Refrigerant condensation
temperature tc/Co
or (only with connected temperature probe)
Evaporation pressure
Measured temperature t
oh
/T1
Condensation pressure
Measured temperature t
cu
/T2
or (only with connected temperature probe)
Evaporation pressure
Superheating Δt
oh
/SH.
Condensation pressure
Subcooling Δt
cu
/SC
With two connected NTC probes, Δt is also shown.
> [Mean/Min/Max]: Record readings, display min./max. readings,
mean values (since switching on).
Tightness test/pressure drop test
Systems can be tested for tightness with the
temperature-compensated tightness test. The system
pressure and the ambient temperature are measured
over a defined period for this. A temperature probe can
be connected that measures the ambient temperature
for this (recommendation: NTC air probe, art. no. 0613
1712). Information about the temperature-compensated
differential pressure and about the temperature at the
beginning/end of the test exists as a result. If no
temperature probe is connected, the tightness test can
be performed without temperature compensation.
✓ The steps described in the chapter "Preparing for
measurement" have been completed.
1. Press [Mode] (leakage test view).
- Leakage test view is opened. ΔP is displayed.
2. Start the leakage test: Press [R, Start/Stop].
3. End the leakage test: Press [R, Start/Stop].
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