Sensor Integration and Material Calibration
32 Configuration and Calibration Guide HD0679 Rev 1.2.0
When calibrating the sensor using the latest versions of Hydro-Com or Hydro-View, Unscaled
values are stored for each measurement mode for each calibration point. This means that
once a valid calibration has been carried out, a correct moisture value for each mode is
always available. The sensor therefore stores a set of A, B, C and D coefficients for each
mode.
The advantages of calibrating inside the sensor are:
•
Advanced free software improving calibration accuracy, including diagnostics
software.
•
Control system does not need modification to calibrate the sensor.
•
Calibrations can be transferred between sensors.
4.2
Calibration inside the Control System
Sensor
3 U
Control Panel /PLC
Moisture %
Filtered Unscaled
Unscaled converted to Moisture
Figure 17 - Calibration inside the Control System
The advantages of calibrating inside the control system are:
•
Direct calibration without the need for an additional computer or RS485 adapter.
•
No need to learn how to use additional software.
•
If it is necessary to replace the sensor, a replacement Hydronix sensor can be
connected and valid results obtained immediately without connecting the sensor to a
PC to update the material calibration.
•
Calibrations can be switched between sensors easily.
5 Calibration Procedure for Flowing Material (Linear)
To determine the calibration line, at least two points are required. Each point is derived by
flowing material over the sensor and finding the sensor’s Unscaled reading. At the same time a
sample of the material should be taken and dried to find its true moisture content. This gives
‘Moisture’ and a corresponding ‘Unscaled’ 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 sensor to the material. This
procedure uses the Hydro-Com utility and the calibration information is stored inside the sensor.
Full details of the calibration process are contained in the Hydro-Com User Guide HD0682
.
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 refer to your particular standard or
contact Hydronix at [email protected].
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 ...
