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Primus drift against the recorder PC, from breath matching

Drift of the Primus stamps against the SNUADC on its stamp model (the recorder PC's timeline), from the slope of the airway-pressure-to-CVP lag within each stretch between Primus AWP pauses, per recording.
Value 104 ppm (p10–p90 28 to 184; 178 recordings; whole-recording lines give +87 ppm median in 1,060 (p10–p90 −49 to +229))
Status measured: Measured in a study.
From The Primus ventilator against SNUADC, by breaths
About Primus against the recorder PC
Date 2026-10-19

Notes

Relative to the recorder PC through the SNUADC stamp model, whose own error is a few ppm. The pilot gave +92 ppm (20 cases). The Primus's small correction steps imply only 1–11 ppm (Primus drift implied by its corrections): they do not track this drift. The lag also steps at the AWP pauses, but by amounts unrelated to the drift built up (median −29 ms, p10–p90 −685 to +494 ms), so the pauses are not drift resets.

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