UNCERTAINTY OF A MANOMETRIC METHOD FOR DETERMINING THE HUMIDITY OF FIBROUS MATERIALS

A manometric method for determining the moisture content of fibrous materials is considered. The scheme and principle of operation of the device. A formula is given for calculating the moisture content of a material. According to the obtained measurement model, the determination of the moisture content of materials is reduced to measuring the heating temperature, the initial and final values of the volumes of vessels and pressures in the vessels before and after their communication. It is emphasized that the two-chamber manometric method for determining the moisture content of materials is an indirect measurement. To determine the measurement result and its uncertainty, it is necessary to justify and choose one of the appropriate methods for determining the measurement results and assess their uncertainty - the linearization method or the reduction method. The main sources of uncertainty are identified. The pairwise correlation between the estimates of the input quantities and the verification of the condition for the insignificance of the remainder term in the expansion of the measurement model in the Taylor series are estimated. Formulas for determining the sensitivity coefficients of the total standard uncertainty to the standard uncertainties of input quantities are presented. Standard, summary and extended uncertainties are provided.