Type / No.
Rev.
Date
Page
Total pages
EW082.695_en
5
02 August 2010
17
28
EsiWelma
s.r.l.
Apply the gas to the sensor at the default concentration and wait for about 3 minutes for
reading to stabilise the value on the third line of the display will stabilise. (WARNING: this is
always an absolute value).
At this point it is possible to press:
ESCAPE to take the sensor back to normal operation
ENTER to start up calibration at the gas concentration of the 2
nd
point
Calibration only takes a few seconds and the display will show In progress…
At the end, it will show:
If the point calibration has been successful, where:
VVVV = Values read by the converter and expressed in steps at point 0 and at the 2
nd
point.
Or:
At this point it is possible to press:
ESCAPE to take the sensor back to normal operation
ENTER to unconditionally repeat calibration of the 2
nd
point.
If a calibration error occurs, press ENTER and the display will show the calibration fail. To
return to the display as per Fig. 4.2, switch off the system, wait for at least ten seconds, then
power up again.
if the fault persists, the error shows again on the display as follows
S e n s o r :
T T T T T T T
C a l i b r a t i o n I I P o i n t
P = 0 X X X
O k : t 0 = V V V V t = V V V V
Fig. 4.17
S e n s o r :
T T T T T T T
C a l i b r a t i o n I I P o i n t
P = 0 X X X
F a i l : t 0 = V V V V t = V V V V
Fig. 4.18
F a i l :
W r o n g C a l i b r a t i o n
Fig. 4.19