Xylem MULTI 1970I PORTABLE MULTIPARAMETER METERS - Manual (Page 17)

Multi 1970i Operation
15
4 Operation
4.1 Operating structure
Active and inactive REL
socket
In addition to the pH/ORP sensor, the sensor on the REL1 or REL2
socket can be actuated (switched "active"). The other socket is not ac-
tuated ("inactive"). This switching over inside the instrument is made
with the aid of a relay. The active REL socket is shown on the display.
The measured variable on the display can be selected as follows using
the <M> key:
Several measuring modes are available within a measured variable.
Switch over between the measured variables with the <
▲> or <▼> key.
The options are summarized in the following diagram:
z Press <M> shortly: Switch between the pH/ORP sensor and
the sensor at the active REL socket
z Press <M> for a longer
period of time:
Change the active Rel socket