wtw PB 150, Operating Manual

Page: 72 / 108

Service menu
72
7.4.7 Conductivity
The electrodes in the vacuum dosage vessel serve to recognize the fill-
ing level in the vacuum dosage vessel. As soon as the medium reaches
the electrodes the suction pump is switched off.
You can adjust the sensitivity of the electrodes.
The standard setting is 288, which corresponds to somewhat more
than 50 µS/cm. This setting is suitable for the recognition of aqueous
samples.
The sensitivity of the conductivity electrodes is a value without dimen-
sion.
Note
If the sensitivity is too low the tubing system may be flooded.
If the sensitivity is too high this may cause a permanent signal and
prevent sampling.
1 Call up the service menu (see section 7.4.1 E
NTERING THE
PASSWORD
).
2 Using
ud
scroll to the CONDUCTIVITY menu.
3 Press
g
.
A cursor appears on the displayed value.
4 Using
ud
and
lr
increase or decrease the value.
5 Using
g
confirm the value.
The new value has been set; the cursor has disappeared.
6 Using
ud
switch to the next setting.