Fertilizers mineral

6.2 Requirements for measuring instruments, auxiliary devices and reagents
6.4 Taking measurements
If condition (15) is not met, then repeat the calibration of the moisture meter, if possible, increase
2 The moisture meter is recommended to be installed in places that ensure maximum homogeneity of the analyzed
mineral fertilizer and intermediate product in terms of the mass fraction of moisture, for example, immediately after the
places of pouring.
6.1.2 According to the specifics of the use of moisture meters that implement the IR spectroscopy method,
reproducibility indicators are not established. The measurement results obtained by NIR spectroscopy are controlled by the
arbitration method.
where W, - the results of measurement by a moisture meter,
%; Wc is the result of measuring the mass fraction of moisture obtained by the arbitration method, %; 6 -
confidence limits of the error according to table 2.
GOST 8.613 - 2012
Notes 1 Before
the moisture meter at a distance of about 1 m, it is recommended to install a leveling device to ensure a constant
distance between the measuring unit of the moisture meter and the analyzed mineral fertilizer and intermediate product.
Note - When measuring in laboratory conditions, a sample of mineral fertilizers and middlings is placed in a cuvette
from the moisture meter kit, the surface is leveled and the result of measurements of the mass fraction of moisture is read in
accordance with the OM for the moisture meter. The verification of the acceptability of the results of determinations obtained
under repeatability conditions is carried out according to 5.6.2.
6.3.2 The moisture meter is fixed in accordance with the OM above the conveyor belt.
6.3 Preparing for measurements
mass fraction of moisture check the condition
rhenium with a moisture meter can be carried out according to the methodology for testing a batch of finished products,
approved in the prescribed manner.
6.3.1 The moisture meter is calibrated and prepared for measurements in accordance with the OM. An example of
the construction of a GC moisture meter MCT-360 manufactured by Process Sensors (USA), using samples of mineral
fertilizers and middlings with established values of the mass fraction of moisture, is given in Appendix B.
- the range of selected wavelengths is not less than 1400 ... 2200 nm in the NIR region of the spectrum;
- the limit of the permissible relative standard deviation of the output signal is 2%. 6.2.2 Scales with a weighing limit
of 2 kg II (high) accuracy class according to GOST OIML R 76-1. 6.2.3 Distilled water in accordance with GOST
6709. 6.2.4 Climatic chamber providing the operating
range of set and maintained influencing factors: temperature from 5 °C to 70 °C and relative air humidity from 10%
to 90% with allowable deviations of no more than ± 3 °ÿ and no more than ±3%, respectively - for a long time (100 h).
6.4.2 When monitoring the stability of the GC moisture meter over the entire range of measured values
Evaluation of the measurement result of the mass fraction of moisture in a commercial batch based on the results of the change
sticks:
the mass fraction of moisture is read from the electronic display of the moisture meter.
6.4.3
6.2.1 NIR spectroscopy moisture meter with the following main characteristics
6.4.1 Measurements with a moisture meter are carried out in accordance with the OM. Single measurement results