Sensor Integration and Material Calibration
34 Configuration and Calibration Guide HD0679 Rev 1.2.0
7. All three samples should be completely dried and the results compared. Use the moisture
calculator to calculate the moisture %, (see section 5.4). If the results differ by more than
0.3% moisture then the samples should be discarded and the calibration process
repeated. This can indicate an error in the sampling process or the lab tests.
8. Use the average moisture of the three samples to correlate to the Average Unscaled
value.
9. This process should be repeated for additional calibration points. Ideally calibration points
should be collected that represent the full working moisture range of the material.
For instructions on how to calibrate using Hydro-Com see the Hydro-Com user
guide document number HD0682
Note 1) Standards for testing aggregates recommend that for representative
sampling, at least 20kg of bulk material is required (0-4mm material)
Note 2) Standards for testing aggregates recommend that for representative
sampling, the difference in moisture should be no greater than 0.1%
5.4
Calculating the Moisture Content
320.
3g
1288
.7g
1236
.3g
= A
= B
= C
Moisture Content =
(B-C)
(C-A)
x 100%
Example
Moisture Content =
1288.7g – 1236.3g
1236.2g – 320.3g
x 100% = 5.7%
(
Note that moisture calculated in this example is based upon the dry weight.)
6 Good/Bad Calibration
A good calibration is made by analysing samples and taking readings over the full working
moisture range of the material. As many points as practical should be made as more points
provide higher accuracy. The graph below shows a good calibration with high linearity.
Good Moisture Calibration Data
0
2
4
6
8
10
12
0
20
40
60
80
100
120
Sensor Unscaled Output
B
ake
-O
u
t Mo
is
tu
re
%
Best Fit Line
Figure 18 - Example of Good Material Calibration
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 ...
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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 ...
