FT-50 Fill Level Inspector Service Manual
8-20
Sensor System Troubleshooting
Scintillation Tube Detector (STD)
Unable to calibrate the Scintillation Tube Detector.
If the calibration LED does not double peak during the calibration
procedure, the detector is faulty and must be replaced. See
Chapter
6: FT-50 Calibration Procedures
for more information.
Gamma counts decrease significantly within a short period of time.
If the gamma counts suddenly decrease significantly and
continues to decrease, the STD is worn out and must be replaced.
You can view the active gamma counts by using the Gamma
Counts function.
High or erratic gamma counts.
If the gamma counts suddenly increase significantly or become
erratic, check to be certain the STD is grounded properly:
1.
Remove the STD and wipe it with a clean cloth.
2.
Wipe the mounting clamp and chassis also.
3.
Check to be sure the grounding wire is secure at both ends.
4.
Replace the STD making sure the mounting clamp contacts the
STD firmly and cleanly.
Solid State Detector (SSD)
High or erratic gamma counts.
If the gamma counts suddenly increase significantly or become
erratic, check to be sure the grounding wire is secure at both ends.
Gamma counts reduce to zero.
The detector power supply has failed.
•
If the detector power supply led is red, the power supply has
failed and must be replaced.
•
If the detector power supply is off, the detector is not getting
power from the Main Power Supply Board. Test the Main
Power Supply Board.
Industrial Dynamics Company, Ltd. Document 40255-0600
