When the fork is covered with solids material, the test button has no effect.
5.5
LED for diagnostics
Versions of the Rosemount 2521 with NAMUR electronics have a LED for
indicating diagnostics while installed in a silo or other storage vessel. The
LED is on the electronic PCB (see
When the LED is off, the fork sensor is measuring normal strong vibrations.
This indicates the fork is clean and switching the output signal as expected.
When the LED is blinking, the fork sensor is measuring weak vibrations. A
gradual decrease in the vibration indicates a possible increase in the build-up
of solids material on the fork. If the LED continues to blink after cleaning the
fork, try a higher sensitivity setting.
When the LED is constantly on, the vibration has stopped. This indicates the
fork is fully covered by solids material.
Figure 5-5: Location of Diagnostics LED
A
B
A. Test button
B. LED for diagnostics
Quick Start Guide
October 2020
32
Quick Start Guide
