If your ColorTrend HT readings are not as expected, perform the steps below to attempt to diagnose and/or correct the problem.
Perform the white calibrator test as described here.
There may be specular light interference. Ensure that the sensor is mounted at the proper tilt angle as described here.
There may be a problem with the distance calibration. Read the white tile at several different distances. The readings should stay relatively constant.
Test the instrument against a standard product you read when the sensor was first installed. The readings should not vary greatly.
Eliminate variables like product orientation and line speed as problems by reading a standard product in a static offline environment.
If the Utility Software height display has gone to 0.0 and the color display has stayed at the target values or gone to 0.0 or the three lights on the terminal (Cal, Setup, and Diag) blink continuously, consider the following:
Track Color is ON and the measured color is outside the preset range. Present product that is in-spec or adjust the color range in the product setup.
The product is located beyond the preset cut-off distance and the hold time has elapsed. Extend the cut-off distance in the product setup.
The product height may be out of range.
If the sensor has not been standardized since the last firmware update, standardize it.
If the problem is still experienced after following these instructions, instrument service may be required.
To read Six Things You Can Do to Help Your Instrument Perform at Its Best, click here.
If additional assistance is required, you may contact HunterLab.