TESTO 557s - 9.3.2 Refrigeration

9 Smart App
50
9.3.1.2 Table view
1
Open the main
menu
2
Change of display
3
Column with date and
time
4
Arrow keys to go
directly to the end of
the table
5
Status bar
6
Open the
configuration menu
7
Probe ID -
measurement unit
8
Measuring values
9
New/Start/Stop/Save
button
9.3.2 Refrigeration
The Refrigeration application is used to determine the following system
measuring values:
• Low-pressure side: Evaporation pressure, refrigerant evaporation
temperature to/Ev (T evap.)
• Evaporation pressure: Measured temperature toh/T1
• Evaporation pressure: Superheating Δtoh/SH
• High-pressure side: Condensation pressure, refrigerant condensation
temperature tc/Co (T condens.)
• Condensation pressure: Measured temperature tcu/T2
• Condensation pressure: Subcooling Δtcu/SC
The testo 115i clamp thermometer is used for the measurement.
An NTC temperature sensor (accessory) must be connected for
measuring the pipe temperature and for automatic calculation of
superheating and subcooling. Testo Smart Probes (e.g. testo 115i) can
be used.