50 Configuration and Calibration Guide HD0679 Rev 1.2.0
Q:
The sensor readings are changing erratically and are not consistent with the changes in
moisture in the material. Is there a reason for this?
A:
It is possible that some material is building up on the sensor face during the flow. With a build-
up even if there is a change in the moisture, the sensor only ‘sees’ the material in front of it
causing the reading to stay reasonably constant. The reading might remain constant until the
build-up is dislodged, allowing the new material to flow over the sensor face. This would
cause a sudden change in the readings. To check if this is the case, try hitting the sides of
the bin/silo to knock off any fouling material and see if the readings change. Also, check the
mounting angle of the sensor. The ceramic should be mounted at an angle which allows
material to pass continuously over the sensor face plate. Bin mounted sensors have two lines
on the rear plate label that indicate the angle that the sensor should be installed in relation to
the material flow. Correct alignment is where either line is in line with the material flow,
indicating that the ceramic is at the correct angle.
Q:
Does the angle of the sensor affect the reading?
A:
It is possible that changing the angle of the sensor can affect the readings. This is due to a
change in compaction or density of the material flowing past the measurement face. In
practice, small changes in the angle will have a negligible effect on the readings, but a large
change in the mounting angle (>10 degrees) will affect the readings and ultimately the
calibration will become invalid. For this reason it is essential that when removing a sensor or
replacing it, the same angle is maintained.
Q:
Why does the sensor output negative moisture when the bin is empty?
A:
The Unscaled output for air will be less than the Unscaled reading for 0% moisture of the
material; hence the moisture output will read negative.
Q:
What is the maximum length of cable I can use?
A:
See the relevant sensor installation guide for full technical specifications.
Summary of Contents for Hydro-Mix
Page 4: ...4 Configuration and Calibration Guide HD0679 Rev 1 2 0 ...
Page 6: ...6 Configuration and Calibration Guide HD0679 Rev 1 2 0 ...
Page 8: ...8 Configuration and Calibration Guide HD0679 Rev 1 2 0 ...
Page 10: ...10 Configuration and Calibration Guide HD0679 Rev 1 2 0 ...
Page 14: ...Chapter 1 Introduction 14 Configuration and Calibration Guide HD0679 Rev 1 2 0 ...
Page 28: ...Chapter 2 Configuration 28 Configuration and Calibration Guide HD0679 Rev 1 2 0 ...
Page 42: ...Chapter 4 Best Practices 42 Configuration and Calibration Guide HD0679 Rev 1 2 0 ...
Page 48: ...Chapter 5 Sensor Diagnostics 48 Configuration and Calibration Guide HD0679 Rev 1 2 0 ...
Page 52: ...Appendix A Document Cross Reference 52 Configuration and Calibration Guide HD0679 Rev 1 2 0 ...
