User Manual
WD2145-WD1160-WD4060-WD4190
Page 30 - 85
5.7
A0 THERMAL DISINFECTION PARAMETER
The
A
0
parameter (introduced by the EN 15883 standard
3
) allows a numerical value to be assigned to the thermal
disinfection carried out - shown by
Td
in the interface LEDs.
When calculating the parameter, only the time intervals during which the temperature is above 65°C are considered.
For thermal disinfection programs, the calculation is simplified by only including the “extension” phase, when the
temperature is kept constant at close to the target value set.
Programs that include thermal disinfection have therefore been designed to offer the following
A
0
values:
Temperature [°C] and time [min]
A
0
90°C - 1’
600
90°C - 5’
3000
93°C - 5’
6000
93°C - 10’
12000
The formula for calculating
A
0
is given below.
10
80
0
10
T
A
= Time in seconds for which the disinfection temperature must be maintained.
T
= Disinfection temperature in °C.
If the temperature is 80°C, A
0
is equal to the temperature maintenance time.
3
EUROPEAN STANDARD EN 15883 “Washer-Disinfectors” , with particular reference to section 3
Terms and Definitions
and annex B,
A
0
concept
. of
part 1 of the standard, 15883-1.
