Education of the republic of uzbekistan tashkent state technical university named after islam karimov

№3/2021 year 
Technical science and innovation
198 
combination of primary and secondary measuring conductors, which are close to accuracy and 
metrological reliability, but differ in the sensitivity to exposure to the quantities that make up 
the error component. Bourdon tube with a pressure sensor is an example. The critical 
component of the error results from residual deformations that occur during operation. The 
pressure is measured by the motion of the free end and additionally by the motion of the 
intermediate point. The displacement ratio of these points is used as a diagnostic parameter 
characterizing the critical component - errors. The level of critical components in the sensor is 
automatically controlled and the probability of the error being exceeded by other components is 
very low. 
Metrological self-monitoring should form an assessment of the status of the 
measurement result. Depending on the functions performed by the sensor, the results of 
metrological self-monitoring may include: 
1.
Assess the error or an important component of the error (including correction, if 
any); 
2.
Evaluation of the remaining metrological resource; 
3.
Archive of metrological self-monitoring data. 
In addition to the features required by the state standard, the following features should 
be provided in the documentation for intelligent sensors to eliminate the possibility of unfair 
competition: 
1.
The method of used metrological self-observation; 
2.
Critical components of error; 
3.
The time interval between self-monitoring procedures; 
4.
Availability of automatic error correction function; 
5.
Limit values of measurement error or critical components for which automatic 
correction is performed; 
6.
Additional functions performed on the basis of the results of metrological self-
monitoring, such as self-correction in case of a defect or forecasting of the 
remaining metrological resource. 
Self-correction can be accomplished by changing the data processing program and 
deteriorating the metrological properties. 
The recommended maximum calibration interval should be proven and determined at 
the stage of intelligent sensor development, taking into account the limitations of the selected 
metrological self-monitoring method. 
An estimate of the remaining metrological service data calculated over a sufficiently 
long period of time based on the results of metrological self-monitoring can be used to 
determine the next inspection or calibration time. 
RESULTS. 
Precise planning of the process of purchasing a new measuring instrument 
based on the data analyzed above can help prevent many errors. It is necessary to plan actions 
and determine the results to be achieved at each stage. In the future, it is necessary to follow to 
the planned plan and not miss a single step - so there is no risk of losing important things. 
Based on our own experience, we recommend the following steps while choosing a new device.