....if different pumps, even of identical model and brand, deliver slightly different amounts of insulin when set at the same rates?
I'm not thinking differences in the range of entire units, but maybe 0.01-0.02 unit differences in delivery when set at the same rates, due to minute differences in the mechanics.
The reason I even ask this question is that when I changed my infusion set first thing Monday morning this week, I also switched to the pump replacing my old, cracked one, and ever since I've had way more hypos than usual. Actually to the point where there are almost as many readings below 4.0 mmol/l as there are between 4.0 mmol/l (72 mg/dl) and 8.5 mmol/l (154 mg/dl) (my desired range). I've only had one high reading Tuesday morning after overtreating a pre-bed hypo in fear of more hypos after a day with no less than 10 readings of 2.1-3.3 mmol/l (38-60 mg/dl)!
I'd entered all my settings with my old pump in one hand and the new one in the other, reviewing them all multiple times to be sure that there were no discrepancies. The significant number of lows could of course be caused by something else and in this sense be totally coincidental, but I do find it strange that it's been like this since Monday. I'll await how the numbers behave after my next site change before I start tweaking basal rates and ins:carb-ratios. Until then I'm wondering about pumps, precision and performance - as well as how I avoid the next hypo :-)