What is the acceptable slope criteria for an HQd LDO Probe?
Acceptable slope criteria for an HQd LDO Probe
If the slope is outside 20% from the factory calibration it will not calibrate and provide a slope out of range error message. The slope is calculated by the mg/L reading on 100% DO from a user calibration, divided by the factory calibration curve for the mg/L DO reading on 100% DO at the same temperature and pressure. That is why user calibrations commonly result in a slope that is more than 105% or less than 95%.