S/R – By design, the S/R ratio will slowly decrease as the filter wheel leaks carbon monoxide (CO). Typically, this can take 3-5 years before the filter wheel would need to be replaced.
With Predictive Diagnostics, the instrument will look at the S/R ratio every time a zero calibration is performed & take note of the value. If it is predicted that the S/R will be <1.14 within 60 days, an alert will be triggered to inform you to change the filter wheel before you experience unplanned downtime.