The site went offline Thursday 4/13 at 6:10 pm. Friday was a holiday so we had to wait until today 4/17 to go there.
The UPS was off and what was reported to us by one of the teachers as a beeping sound that afternoon might have been the UPS running out of battery.
The O3 instrument was running but the computer was off so measurements were not recorded.
I turned the UPS back on and everything seems fine but we replaced the UPS just in case the battery in the old UPS is failing and beeping returns.
We will monitor the site.
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