62 Hydro-Probe XT User Guide HD0538 Rev: 1.6.0
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, and so
despite there being a change in moisture of the material, the sensor only ‘sees’ the material in
front of it and so the reading could stay reasonably constant until such time as this material
falls off 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. The Hydro-Probe XT sensor has two lines, marked A and B on the rear
plate label. Correct alignment is where either line A or line B is horizontal, indicating that the
ceramic is at the correct angle as suggested on Page 15.
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 suggested that when removing any sensor
and then refitting it, it should be positioned to the same angle.
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:
Содержание Hydro-Probe XT
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Страница 14: ...Chapter 1 Introduction 14 Hydro Probe XT User Guide HD0538 Rev 1 6 0 ...
Страница 42: ...Chapter 4 Configuration 42 Hydro Probe XT User Guide HD0538 Rev 1 6 0 ...
Страница 52: ...Chapter 6 Optimising Sensor and Process Performance 52 Hydro Probe XT User Guide HD0538 Rev 1 6 0 ...
Страница 58: ...Chapter 7 Sensor diagnostics 58 Hydro Probe XT User Guide HD0538 Rev 1 6 0 ...
Страница 60: ...Chapter 8 Technical specification 60 Hydro Probe XT User Guide HD0538 Rev 1 6 0 ...
Страница 66: ...Appendix B Document Cross Reference 66 Hydro Probe XT User Guide HD0538 Rev 1 6 0 ...
