User Manual

8 Tips and assistance
20
Changing the valve or valve stem shutoff
DO NOT ATTEMPT to change the valve stems. Changing the
valve stem shutoff or valves themselves will void the warranty.
Send the measuring instrument to Testo Customer Service.
8 Tips and assistance
8.1. Questions and answers
Question
Possible causes/solution
flashes
Batteries are nearly discharged.
> Replace batteries.
The instrument switches
off automatically.
Batteries are discharged.
> Replace batteries.
uuuu lights up instead of
the parameter display
The maximum measurement range
has been exceeded.
oooo lights up instead of
the parameter display
Under range value has been
exceeded.
8.2. Measurement parameters
bar, °C
psi, °F
Description
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