LI213x
Binary level sensor for overflow prevention / leakage detection according to WHG
16
The device is operational just with empty adjustment. However, it is recommended to carry out a
“full adjustment” with the active zone being completely covered after empty adjustment. It is
recommended to use a test medium with the same dielectric constant as the medium to be
monitored for leakage. On the basis of the values for the empty state / full state the device
software determines the optimum position of the switching thresholds between the two states.
Using both adjustment criteria (empty and full adjustment) results in the maximum operational
reliability for the application. The full adjustment can be repeated as often as you like. The
stored value for the empty state is not overwritten by the full adjustment. After a new empty
adjustment both values are automatically reset; the values defined last are overwritten.
7.5 Full adjustment
7.5.1 Application as overflow prevention or maximum monitoring
After empty adjustment the full state is to be achieved, if possible, so that the device switches (both
yellow LEDs are off).
u
Fill the tank until the active zone is completely covered.
u
Unlock device
u
Actuate the teach button for at least 4 s / not more than 7 s.
w
First, the green LED3 is shortly extinguished, after 1 s the two
yellow LEDs start flashing slowly (approx. 1 Hz) before flashing
quickly (approx. 2 Hz) after 4 s.
u
Release the teach button (remove metal object).
w
Successful full adjustment is acknowledged with a double-
flashing (approx. 2 Hz) of the green LED.
w
The device is ready for operation.
After the full adjustment, both yellow LEDs are off, only the green LED is still on.
7.5.2 Application as leakage detection
After the empty adjustment, the state “probe covered” should be established, if possible, so that the
device switches (both yellow LEDs are off).