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MCT466-QC User Guide Manual
Each Product Calibration has its individual span and zero settings.
To make a change to the values, touch the number, a numeric keypad will pop up. Type the new
number and touch the ENT key.
3.2.7 Calibration Routine
The Calibration Routine is a linear regression routine that adjusts the NIR tester's calibration
parameters (span and zero) so that the NIR tester's readings match the actual lab moisture readings.
This is done by using a series of representative product sample with moisture contents covering the
moisture range to be measured.
The objective of NIR tester calibration is to obtain a straight-line graphical relationship between the
tester's reading and the true moisture value of a series of samples as shown in Figure 17 below.
MCT
10
8
6
Calibration Routine Process:
4
1-
Select one of the unused Product Calibrations in the NIR tester.
*
2-
Make or collect from the process a series of sample (up to 25) with moisture contents covering the
range expected in the process.
2
3-
Set the Span value to 25.0, the zero to -20 and the damp time to a value of 1.0.
Present the lowest moisture sample to the tester; adjust the zero setting to make the tester's reading
4-
0
2
agree with the true moisture content of the sample. Note the reading.
5-
Present all of the samples to the tester in turn, and make sure to note the tester and actual lab
readings for each sample.
6-
Tabulate the results as shown in Table 1 below:
Process Sensors Corporation
Calibration Graph
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*
4
6
8
10
*
*
*
Figure 17: Calibration Graph
12
14
16
True Moisture
Page 16
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Questions and answers
Hi, we have a model that has not been calibrated since 2022. I **** wondering how often it should be calibrated. As well, is the moisture in dry basis or wet basis?
The document mentions "Calibration Confirmation: Calibration Check Standard" during scheduled plant maintenance but does not specify an exact frequency for calibration. The moisture measurement can be in dry basis mode, as described, where moisture is calculated as a percentage of the dry material rather than the wet material.
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