Fertilizers mineral

5.6.2 Checking the acceptability of test results obtained under repeat conditions
single definition. If the absolute
discrepancy between the maximum and minimum results (range) of determining the mass fraction of moisture (Wmax - I / t | P) is not
more than the value of the critical range CR0 95 for a 95% confidence level and the number of measurements n = 3, then as the final result
indicate the arithmetic mean of the results of the three determinations. The value of the critical range CR0 95 for n = 3 is found by the formula
The IR TG method involves obtaining a measurement result according to one definition in cases
r = 2.77 og,
niya.
GOST 8.613-2012
- in the cuvette from the IR TG moisture meter kit, the sample is evenly distributed, guided by
take the arithmetic mean of the results of two parallel determinations.
where r is the standard deviation of repeatability for the corresponding range of measurements according to Table 1, then the arithmetic mean
of the results of two parallel determinations is taken as the measurement result.
5.5 Taking measurements
5.6.1 Change in weight of sample during the drying process, mathematical processing and calculation of the mass fraction of moisture
are carried out automatically by the IR TG moisture meter with the result of a single determination on the electronic display of the moisture meter.
If the absolute discrepancy between the results of parallel determinations obtained under repeatability conditions does not exceed the
value of the repeatability limit r calculated by the formula
If the range of the results of the three determinations exceeds the value of CR0 95 calculated by formula (2), find out the reasons for
exceeding the repeatability limit, eliminate them and repeat the measurement.
noe fertilizer and middlings of a particular type.
Checking the acceptability of the results of determinations obtained under repeatability conditions1), about
Note - Recommended sample weights and drying parameters are given in Appendix A.
Note - Taking into account the specifics of the design of the IR TG moisture meter, successive determinations of the
moisture mass fraction of samples taken from the same sample are taken as parallel determinations of the mass fraction of
moisture.
Machine Translated by Google

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R= 2-77 °R,
(5)