Sensor Integration and Calibration
Hydro-Probe XT User Guide HD0538 Rev: 1.6.0 47
2.4
Calibration procedure
To determine the calibration line, at least two points (moisture tests) are required. Each point
is derived by flowing material over the sensor and recording the sensor’s Unscaled reading, at
the same time taking a representative sample of the material and drying it to determine its
true moisture content. This gives a ‘Moisture’ and an ‘Unscaled’ value which can be plotted
on a graph. With at least two points, a calibration line can be drawn.
The following procedure is recommended when calibrating the Hydro-Probe XT to the
material. This procedure uses the Hydro-Com utility and the calibration information is stored
inside the sensor. Whether the calibration data is stored within the sensor or the control
system, the process is the same.
There are international standards for testing and sampling that are designed to ensure that
the moisture content derived is accurate and representative. These standards will define
accuracy of weighing systems and sampling techniques in order to make the samples
representative of the flowing material. For more information on sampling please contact
Hydronix at [email protected] or refer to your particular standard.
2.4.1
Hints and safety
•
Wear safety glasses and protective clothing to guard against ejection of material
during the drying process.
•
Do not attempt to calibrate the sensor by packing material on the face. The readings
obtained will not be representative of those from a real application.
•
Always sample where the sensor is located.
•
Always take a reading of Unscaled at the same time as sampling.
•
Never assume that material flowing out of two gates in the same bin is the same
moisture content and do not attempt to take samples from the flow in both gates to get
an average value – always use two sensors and calibrate each sensor separately.
•
Always average the sensor’s readings. For best results use the digital input to control
the sensor’s internal averaging function, or average inside the control system.
•
Ensure the sensor sees a representative sample of material.
•
Ensure a representative sample is taken for moisture testing.
2.4.2
Equipment
•
Weighing scales
– to weigh up to 2kg, accurate to 0.1g
•
Heat source
– for drying samples, such as an electric hot plate or oven.
•
Container
– with resealable lid for storing samples
•
Polythene bags
– for storing samples prior to drying
•
Scoop
– for collecting samples
•
Safety equipment
– including glasses, heat resistant gloves and protective clothing.
NOTES: For full instructions on using Hydro-Com, refer to the Hydro-Com User
Guide (HD0682).
The same principles apply with or without using Hydro-Com when calibrating.
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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 ...
