40 Hydro-Probe XT User Guide HD0538 Rev: 1.6.0
calibrated moisture reading (see Figure 33). This assumes that the sensor remains capable of
measuring across the full moisture range required and that the sensor is not configured to be
impracticably overly sensitive.
In certain materials such as organic products the relationship between Unscaled values and
moisture means that a smaller change in Unscaled values gives a large change in the
moisture value when operating in Standard Mode. This makes the sensor less precise. In
Figure 33 below, calibration line A is less precise than calibration line B.
The ability to select the fundamental measurement technique allows the user to choose the
technique that reduces the slope of the calibration line (see Figure 33, line B). The
mathematical algorithms employed in the sensor have been specially devised to respond in a
different manner dependant on the material being measured. All modes will give a stable
linear output, however line ‘B’ will give better precision and accuracy. Modes V and E will also
be less susceptible to density fluctuations.
1%
5
5%
4%
3%
2%
40
35
30
25
20
15
10
0
A
B
5 unscaled units = 1.7%
5 unscaled units = 0.4%
Sensor Unscaled Value
Moisture
%
Value
Figure 33: Relationship of moisture % to Unscaled values
To determine which mode is the most appropriate it is recommend to run trials for a given
material and application.
Trials differ dependant on the application. For a measurement taken over time it is
recommended to record the sensor’s output from each of the different measurement modes in
the same process. Data can easily be recorded using a PC and the Hydronix Hydro-Com
software, these results may then be plotted in a spreadsheet. When viewed in graph form it is
often self-evident which mode gives the desired performance characteristics.
Hydronix can supply additional software to assist with detailed analysis of the measurement
modes and optimisation of the sensor filtering parameters if required.
Hydro-Com software and the user guide may be downloaded from www.hydronix.com.
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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 ...
