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Environmental Monitoring (Environmental Monitoring)
fiori, tringali, paoletti - 14:17 Tuesday 03 March 2026 (68802) Print this report
EMS recovery

This morning (with the help of Maria and Federico from remote) I recovered manually environmental sensors which had been off since the power outage. Sensors in CEB, MCB and FCEB were affected.

Most sensors recovered successfully.  

Sensors which still have troubles are the following:

  • ENV_CEB_MIC and ENV_EDB_MIC microphones are still off because their Nexus driver (DAQ room) didn't come back on. One possibility, already occurred in the past, is that the AC/DC converter is damaged and needs to be replaced.
  • ENV_CEB_ELECTRIC. The Stanford differential voltage meter lost its settings and needs to be reprogrammed. To be done at next occasion. Federico provided instructions, here reported for future reference: "Set in differential mode, band limited from below 1Hz to above 10kHz with some margin, and tune Gain up to recovering the signal level pre-shutdown, by looking at tred rms value".
  • ENV_EXT_MAG_N, external magnetometer. Probably the battery (located in the external shelter box) did not survive the prolonged shut down of the DC voltage supplier (loacted in DET EEroom) which we turned back on, but is not cable to bring the battery at the desired 24V. Probably the battery has to be replaced. The magnetometer signal is there but looks noisy, al least above 1kHz, to be monitored.
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fiori, lunghini, paoletti - 15:36 Wednesday 04 March 2026 (68815) Print this report

With the help of Federico from remote, we made a temporary fix for the external magnetometer (ENV_EXT_MAG_N). We accessed the magnetometer electronics box located in the little shelter outside of CEB. This box contains one 12V 3Ah lead-gel battery which is connected, in parallel with the magnetometer, to one 24V voltage supplier inside DET-EEroom (the 24V is ment to compensate for the voltage drop along the >100m long cable). The box also contains proper amplification circuits to transmit the magnetometer signal back to the readout ADC in DET-EERoom. 

The battery was erogating just 7V instead of the 12V expected. This is probably due to aging of the battery. We removed the battery and left the magnetometer powered on the remote supplier. In this configuration the magnetometer is more prone to voltage spikes which might occur in the event of lightnings and has no back-up power in case of outages, but it works. For the time being we decided to leave it this way looking for a new battery. Disconnected cables have been secured with tape.

The magnetometer signal apparently looks similar to how it was before, including the drop of response below 10Hz, an issue that has been present since June 2024. Some noise at 5Hz and odd harmonics disappeared (last Figure) but this is more likely due to a disappered source than a magnetometer fixing.

 

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Lunghini, Paoletti, Fiori - 13:12 Thursday 05 March 2026 (68827) Print this report

This morning (March 5, 2026) around 8:30 UTC I went to the external cabinet hosting the electronic box to install a new battery (CSB UPS 12360 7 F2, see Figure 1), the installation was completed at 8:53 UTC. The box was closed and placed back inside the cabinet (see Figure 2).
At 11:45 UTC I went to DET EERoom to check the power supply and it was erogating 0.34 A, 24 V (see Figure 5), the hardware is operating correctly since it is not erogating the maximum current set (~0.8A), with the battery disconnected the erogated current was 0.15 A.
Figure 3 shows the comparison of ENV_EXT_MAG_N signal on May 25th 2024 (orange plot), Februaty 1st 2026 (purple plot), and March 5th 2026 (blue plot). The reference time are choosen to make sure that no tarins are passing trhough the Pisa-Empoli railway (see #68641).
Figure 4 shows the last 24 h of data.

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