Electronic level sensor
LW2120
33
A
B
C
D
A:
level
B:
time
C:
actual level
D:
measured level
Possible cause:
•
A strong tank bottom echo is interpreted as the level.
Recommended actions:
•
Verify the reference height is configured correctly.
•
With very low dielectric media: Reduce the reference height and configure a tank offset.
8.1.10 Level measurement is lost in an empty tank
A
B
F
C
D
E
A:
level
B:
time
C:
actual level
D:
measured level
E:
level measurement lost
F:
manway door open
Possible cause:
•
When the manway door is opened inward, it generates a false echo which is interpreted as the
level. After closing the door, the echo is lost and the transmitter reports - Level measurement lost -.
The message is cleared when the tank is filled.
Recommended actions:
•
Before opening the door, disconnect power to the device.
•
After closing, restart the device.
•
Move the device to another position.
