Seli STS-03 - Number of Calibration Points; Calibration Points: Target Values; Calibration Points: Actual Values; Saving the Calibration

71
18 Troubleshooting
18.1 No or erroneous measured value
 possible cause
 remedy
 No voltage at the sensor
 Check/make electrical connection in
accordance with (chapter 4.3)
 Measuring windows are coated
 Clean the measuring windows
(chapter 7.3)
If the measuring windows get dirty
frequently, it is better to use an
STS04 with SAW8XX quick-change
fitting.
 Erroneous calibration
 Reset the calibration to factory
settings in the calibration menu
(chapter 6.1)
18.2 Strongly fluctuating measured value
 possible cause
 remedy
 Air bubbles in the system
 Dampen display and output current
(chapter 5.2)
 Sensor is not completely submerged
in the process fluid
 Change the installation location