Another week – another rock crusher. ”Tiz the season for the crushing to begin.

This particular rock crusher happened to be located a few miles up the mountain. Which had a great view, but the elevation difference can significantly change your flow rate if you precalibrated the pumps at sea level (which we did). The difference between our pre and post calibration (post calibration was done onsite) had a difference of 1.4%. Not too much, you say, but multiply that times 10 hours of sampling and… that might be significant.

The quick solution is to calibrate onsite. Pre and post. There is a formula you can use to calculate the difference in pressure (due to altitude) but it makes me dizzy just thinking about how to post it on this site.