The Rosemount radar level gauge displays LI/L MM
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I have a question: The Rosemount 5402 can perform a normal self-check after being powered off and restarted. On-site, it shows LI/L MM, while the central control unit displays the maximum value; the current is 21.75 mA, and the handheld controller shows NaN mm. What should be done in this situation?
The information you’re seeing is incorrect; it shouldn’t be what you described. Please verify that
Additionally, this device needs to be configured and tested on-site; if it isn’t tested, anything is possible
Indeed, this shows that it has been in use for two years
Well, it should be LVL MM; the screen should display it in a rotating manner. Is there no other display, like numbers or anything? It’s probably a radar signal loss issue; the configuration needs to be checked. Using your handheld controller won’t work – you need to use software or the Emerson 475
Thank you. It also displays them in turn: one, one, one, one, one-
Contact the manufacturer, stating that the meter head is broken and it has been removed and sent back to the factory
What organization are you from? Could you let me know?
An out-of-range alarm has been triggered; using the handheld controller is ineffective – a computer is needed, along with the RaderMaster software to read the radar signals. It’s likely that the signal strength is too low, which prevents the radar from detecting the signals. It’s also possible that it’s a problem with the radar level gauge; you can try restoring it to its factory settings and then adjusting it again. The radar wave filtering settings depend on the signal strength levels in your installation site. If adjustments are not made on-site after the device is returned to the factory, it will not be possible to determine the actual signal strength there. If the filtering settings are not appropriate, issues such as value jumps or readings exceeding the range may occur
NAN: The liquid level could not be detected. Specifically, there is no value indicating the liquid level on site; the control system shows a full scale or above full scale reading, the current exceeds 20 mA, and the strength of the radar wave signal is too low. The signal strength measured on site is definitely less than 500 mV. Using a handheld controller for this purpose is useless, as you cannot see the waveform; instead, a computer is required with the RaderMaster software to read the waveform and check whether the signal strength and filter values are set appropriately. If the signal strength is low, it could also be a problem with the radar level gauge; resetting it to factory settings and adjusting it again should resolve the issue