24 Configuration and Calibration Guide HD0679 Rev 1.2.0
8 Measurement Modes
Measurement Modes enable the sensitivity of the sensor to be optimised for a given material.
Selection of Measurement Modes is not available in all sensors and different models will have
different default Measurement Mode settings. Refer to the technical specification section in the
relevant sensor installation guide for further information.
Up to three Measurement Modes are available: Mode F, Mode V and Mode E.
Selecting the most appropriate mode can have the effect of increasing the precision in the
reading but may limit the highest moisture value measureable by the sensor.
The sensor continuously calculates the Unscaled value in each of the available modes (F, V and
E). It is important to note that the sensor does not work in a particular mode, but rather in all
modes all of the time. Any particular material or process will have an optimum mode of operation
selectable by the operator.
8.1
Selecting which Measurement Mode to Use
The most appropriate mode will be determined by the requirements of the user, the
application and the material being measured.
Precision, stability and density fluctuations as well as the working moisture range are all
factors that may determine the choice of measurement mode.
Mode F is often associated with flowing sand and aggregates and concrete mixer type
applications. Mode F is also suited to Brix measurements.
Mode V and Mode E are often employed with lower density materials such as grain or other
organic materials. They are also associated with any material that has a variable bulk density
that correlates to moisture content. Mode V and Mode E may also be beneficial for high
intensity mixing applications of high density material and for other mixing applications with
distinct changes in density over time (including aggregates and concrete).
The objective is to choose the technique that gives the most desirable (often smoothest)
signal response and most accurate moisture determination.
8.2
Effects of Selecting Different Modes
Each mode will give a different relationship between the sensor’s 0-100 Unscaled values and
the moisture percentage.
When measuring in any material it is usually beneficial that a large change in sensor
Unscaled measurement equates to a small change in moisture levels. This will give the most
precise calibrated moisture measurement (see Figure 10). This assumes that the sensor
remains capable of measuring across the full moisture range required and that the sensor is
not configured to be impractically overly sensitive.
All modes will give a linear stable output. The objective is to choose the mode that displays
the flattest moisture calibration line as shown by line B in Figure 10. It should be noted that
whist line B is more precise, the maximum 100 Unscaled units may be reached at a lower
moisture % than the expected maximum moisture of the material being measured. The exact
highest moisture % achievable is a function of the gradient of the material calibration and
must be determined by the user.
Summary of Contents for Hydro-Mix
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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 ...
