Users Manual Part 1

Level measurement lost in a manway cover installation
Symptom
The transmitter reports "Level measurement lost" when opening/closing the manway
cover.
Figure 7-12: Symptom
A
B
C
D
A. Level
B.
Time
C. Actual level
D. Level measurement lost
Possible cause
If mounted on a manway cover, the transmitter may lock on a disturbance echo and report
this as surface level when the cover is opened. After closing the cover, the echo is lost and
the transmitter reports "Level measurement lost".
Recommended actions
• Before opening the manway cover, disconnect power to the transmitter.
• After closing, restart the device.
• Move the transmitter to another position.
Related information
Restart the device
Installation considerations
Reference Manual Service and troubleshooting
00809-0100-4418
September 2022
Rosemount 3408 Level Transmitter 81