testo Instruments Co. Ltd 056001550 Manuale Utente
8 Tips and assistance
18
8
Tips and assistance
8.1.
Questions and answers
Question Possible
causes/solution
flashes
Batteries are almost empty.
> Change
> Change
batteries.
The instrument switches
off automatically.
off automatically.
Residual capacity of the batteries is
too low.
> Change
too low.
> Change
batteries.
uuuu
lights up instead of
the parameter display
The permissible measuring range has
been undershot.
> Keep to the permitted measuring
been undershot.
> Keep to the permitted measuring
range.
oooo
lights up instead of
the parameter display
The permissible measuring range has
been exceeded.
> Keep to the permitted measuring
been exceeded.
> Keep to the permitted measuring
range.
8.2.
Measurement parameters
Name Description
Δtoh SH
Δtoh SH
Superheating,
evaporation pressure
Δtcu
SC
Subcooling, condensation pressure
to
Ev
Refrigerant evaporation temperature
tc
Co
Refrigerant condensation temperature
toh T1
Measured
temperature, evaporation
tcu
T2
Measured temperature, condensation