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tatsuki.washimi - 20:17 Wednesday 22 February 2023 (24120) Print this report
air pressure offset

Today I went into the tunnel with a portable barometer with taking data, to check whether the pressure difference is actual or not.

When I moved from the Hokubu-kaikan to the Atotsu entrance, the pressure decreased by about 10 hPa. (due to the heater in the building?)
When I was in the tunnel, the portable barometer shows lower pressure than the outside about 2 hPa.
However, the difference was smaller than that of the permanently equipped barometers are showing.

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tatsuki.washimi - 16:48 Friday 24 February 2023 (24144) Print this report

I checked the position dependence of the pressure in more detail.

  • There are no differences between the in-room (building, hut) and the outside.
  • There are no differences in the tunnel (parking, pre-room, CS).
  • The pressure at Mozumi is 10 hPa higher than that at Atotsu.
  • The pressure in the tunnel is 1.2 hPa lower than that outside.

 

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tatsuki.washimi - 19:04 Wednesday 29 March 2023 (24597) Print this report

Today I went to both end stations with a portable barometer and estimated the offsets for each barometers, based on the ATOTSU_OUTSIDE

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