Users Manual Part 2
Table Of Contents
- Contents
- 1 Preliminary note
- 2 Safety instructions
- 3 Intended use
- 4 Items supplied
- 5 Function
- 6 Mounting
- 7 Electrical connection
- 8 Parameter setting
- 9 Operation
- 10 Troubleshooting
- 10.1 Troubleshooting incorrect level readings
- 10.1.1 Level too high / too low
- 10.1.2 Measured value is stuck
- 10.1.3 Measured value drops when level close to antenna
- 10.1.4 Measured value fluctuates
- 10.1.5 Measured value is occasionally unstable
- 10.1.6 Lagging of measured value during rapid level changes
- 10.1.7 Measured value correct at 0% (4 mA) but incorrect at 100% (20 mA)
- 10.1.8 Incorrect measured value when level is above 50%
- 10.1.9 Measured value drops to zero close to tank bottom
- 10.1.10 Level measurement is lost in an empty tank
- 10.1.11 Alert mode when level close to tank bottom
- 10.1 Troubleshooting incorrect level readings
- 11 Maintenance, repair and disposal
- 12 Factory setting
- 13 Appendix
LW2720 Electronic level sensor
40
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.
10.1.10 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.