Therefore is it important for any temperature changes to the INFRA20 mechanism to be slowly varying, so that the device can compensate for these pressure changes. You do not have to use the tubing at all. The INFRA20 electronic noise level is about 20 counts (20 mPa or 60 dB SPL) over the full bandwidth, and this can be measured by cross connecting the ports on the internal differential pressure sensor.
You can download a free copy of jAmaSeis from jAmaSeis download 5. However, we have also had single AmaSeis instances working 24/7 on Windows XP PCs. Similarly measurements can be made from inside stationary automobiles with windows cracked open to provide some wind averaging.
For permanent outdoor installations, burying the INFRA20 in an underground vault with moisture protection may provide very stable temperatures. Note the steep roll off of the 8 pole elliptic 20 Hz low pass filter used in the INFRA20 for anti-aliasing. We are working on a Raspberry Pi system with Raspian and jAmaSeis that would replace the requirement of using a PC or MAC to log INFRA20 data..