The check standard is a stability check and validation that analyzer performance hasn’t changed. After the unit has been calibrated, you go to a pre-selected “Cal Check” product channel and record the high value and low value. The high and low value for the check standard should always be between +/- 0.1 to 0.2 of original cal check values.
There are three immediate benefits for the standards. First is that they are stable and don’t change. Samples of known moisture, oil, coat weight or other parameter are required for calibration. Typically 3-5 samples throughout the range of interest. Calibration is easy. To check calibration after start up, you can’t use retained samples because they aren’t stable and degrade. The Cal Check standards are stable to check analyzer stability.
Secondly, most customers want to routinely validate all of their analyzers performance. The Cal Check standards allow for periodic validation. Most customers who have used our analyzers for a long time check every 3 months. Newer users usually check once a week, then once a month etc. It’s a confidence booster.
Thirdly, if you get an usually high or low measurement you can quickly check whether the analyzer has changed or sample or process. And make necessary adjustments. Calibration Check Standards are a valuable tool in diagnostics.