Testo 550-2 Dgital Manifold Set 0563 5506 数据表

8 Tips and assistance 

18 

 

 

 

 flashes 

Batteries are almost empty. 
> Change 

batteries. 

The instrument switches 
off automatically. 

Residual capacity of the batteries is 
too low. 
> Change 

batteries. 

uuuu lights up instead of 
the parameter display 
 

The permissible measuring range has 
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 

range. 

 

 

Name 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