Filter
Top Products
Calibration Results
The system displays calibration results on the screen and updates them
continuously until the parameters reach endpoint. The system then adjusts the
values to match the theoretically expected results. The screen displays the
measured and the drift values for each calibrated parameter. If a sensor does not
reach endpoint within 90 seconds, the parameter value appears on the screen with
asterisks and the message D5 No Endpoint. The sensor is not in calibration until
the system completes a successful calibration.
Calibration Drift Limits
Variation in the electronic signal generated by sensors in response to samples and
normal sensor aging can cause calibration drift. You can define acceptable
calibration drift limits for the 800 system. If the detected changes to the offset and
the slope values are larger than defined, the system informs you that drift limits are
exceeded. If the drift for a sensor is greater than defined, that sensor is not in
calibration. Until a successful calibration completes, all subsequent measurements
indicate the not-in-calibration condition on the screen and on the printed reports.
Repeating Calibrations with Calibration Drift
The system automatically repeats a calibration when drift limits are exceeded if the
auto repeat or flexible-time options are defined for the system. The system repeats
up to two calibrations to calibrate a sensor or to zero the CO-ox module. It repeats
the calibration only for the sensor with excessive drift, and prints a calibration
report for each repeat calibration. If connected to an LIS, it sends the calibration
data to the LIS. If a sensor fails two repeat calibrations, the sensor is disabled and
not available to measure samples. The screen and printed results identify the
disabled sensor. When a sensor is not available because of excessive drift, the other
sensors are not affected.
Reporting Results with Calibration Drift
You can specify whether you want to report sample results when calibration drift
limits are exceeded. If you do report results with calibration drift, the system
permanently logs this exception in the status log. Refer to Defining Drift Limits in
Section 5.