Hydro-View / Hydro-Hub User Guide HD0864 Rev 1.0.0 57
Chapter 7
Calibration
1 Introduction to Calibration
For sensor applications where the moisture % is required to be directly output, the sensor will
require calibrating to the material that is to be measured.
The Hydro-Net software calibration facility is used to capture Unscaled values and to read this
against corresponding moisture values derived from taking and drying samples. This utility is
intended for use with sensors measuring in flowing materials, such as in bins or on conveyor belts.
The calibration procedure for mixer applications where water is added under controlled conditions
to reach a specified moisture value is performed by the mixer control system or a Hydronix Hydro-
Control and not by the Hydro-Net software.
For full details about the calibration process see the Configuration and Calibration guide
HD0679 or the specific sensor user guide.
2 Calibrating a Sensor
2.1
Coefficients
The calibration process is performed to enable the coefficients to be calculated that are required
to convert the sensors Unscaled output into a true moisture %. For most applications only the
B and C coefficients are required, see the Configuration and Calibration guide HD0679 for
details.
All of the latest Hydronix moisture sensors (excluding the Hydro-Probe) have the ability to select
the measurement mode used to calculate the Unscaled output. To output moisture using the
different measurement modes requires separate coefficients for each mode (F, E and V).
In
older Hydronix sensors (Pre-Firmware HS0102) the sensor has to be calibrated separately in
each mode to create the coefficients.
When Hydro-Net software is connected to the latest versions of the sensors (Firmware HS0102
or higher) the Unscaled values for each measurement mode are stored at the same time. This
facility gives the user the ability to calculate the coefficients in every available measurement
mode simultaneously. With all measurement modes calibrated it is possible to select the most
appropriate mode to use for a given material without requiring the calibration process to be re-
done. The sensor stores the coefficients internally for each mode enabling the sensor to output
the moisture % for any mode as required.
Figure 86: Coefficients for all Measurement Modes
2.2
Calibration Data Table
All calibration data points, including the Unscaled values for each measurement mode and the
resultant moisture %, are stored in the sensor’s memory (Only available with sensors with
firmware HS0102 or higher). This enables the user to interrogate the values used to create the
coefficients and the moisture spread of the collected samples. The chart will also indicate which
samples have been included in the calculations.
Summary of Contents for Hydro-Hub
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Page 14: ...Chapter 1 Introduction 14 Hydro View Hydro Hub User Guide HD0864 Rev 1 0 0 ...
Page 20: ...Chapter 2 Mechanical Installation 20 Hydro View Hydro Hub User Guide HD0864 Rev 1 0 0 ...
Page 38: ...Chapter 4 System Overview 38 Hydro View Hydro Hub User Guide HD0864 Rev 1 0 0 ...
Page 44: ...Chapter 5 Remote Access 44 Hydro View Hydro Hub User Guide HD0864 Rev 1 0 0 ...
Page 70: ...Chapter 7 Calibration 70 Hydro View Hydro Hub User Guide HD0864 Rev 1 0 0 ...
Page 72: ...Appendix A Quick Start Rules 72 Hydro View Hydro Hub User Guide HD0864 Rev 1 0 0 ...
Page 74: ...Appendix B Document Cross Reference 74 Hydro View Hydro Hub User Guide HD0864 Rev 1 0 0 ...