8 | Help with faults BÜCHI Labortechnik AG
30/38 Operation Manual Inert Loop B-295 SE
u Remove the connected oxygen sensor.
u Connect the power cable.
u Press the button MENU.
ð The display shows [PASS].
u Press the following sequence of buttons with-
out interruption.
u Press the button MENU.
ð The display shows [E:1]
u Press the button ENTER.
u Press the button INCREMENT or DECRE-
MENT to set calibration gas level (Air: 20.9 %
O
2
)
or
u Press button ENTER to span the sensor.
ð The display shows [ - - - -].
u Press the button MENU.
ð The span value will be displayed on exit
as % of the initial calibration value.
ð The calibration is passed when the value
is between 20 and 21.
ð The calibration is finished.