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Detector Characterisation (Data monitoring)
Paoletti - 13:58 Thursday 24 January 2019 (44508) Print this report
Comment to magnetic probes (44404)

It is surprising (at least to me) that this temporary magnetic probe (ENV_IER_MAG_RAPROBE), placed on the cover of the RampeAuto crate, detect quite well all Mode Cleaner Building HVAC machine status.

In the attached plot the correlation with the Current Sensors of IPS MCB mains line (ENV_MCB_IPS_CURR_S) and with the MCB magnetometer (ENV_MCB_MAG_N) is clear.

The last plot (INF_MCB_CHILLER_CURR)  is a Current Sensor on the HVAC Chiller machine

Moreover worth noting that when the  magnetic field increases in MCB, the same decreases in the magnetic probe positioned on the cover of the RampeAuto

It's difficult to believe in a direct measurement of the MCB magnetic field at a distance of 150 meters with the temporary probe, also for this "out of phase" behavior. Most likely we are seeing an unwanted coupling effect (e.g. ground current through the ModeCleaner tube?).

Is there a way to measure the (AC) current flowing in the pipe? Wrapping a few wires around it and take a look (with a battery powered system)?

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