Viscosity is the physical quantity that indicates the internal friction in the fluid when it flows, and is the ability of the fluid to resist deformation. Viscosity is widely used in many fields such as daily life, industrial production and scientific research.

The measurement and control of viscosity is very important to ensure the efficiency of industrial production processes, the quality of products, the reliability of equipment and the safety of human health. 

When measuring viscometer, how to make sure its measurement data is accurate and reliable? Factory calibration and periodic verification can solve this problem.

Before leaving the factory or putting into use for the first time, the viscometer must be calibrated to ensure that the performance indicators of the instrument meet the requirements of the national metrology verification regulations;

Periodic verification of the viscometer in use to carry out periodic verification, if necessary (the instrument is used frequently or in a qualified critical state) to carry out intermediate self-inspection to determine its metrological performance qualified, coefficient error within the allowable range, otherwise can not obtain accurate data.

 

The difficulty of calibration of capillary viscometer: time-consuming and low charge. It is a common demand of calibration institutions to free up valuable human resources and use them to create more output value.

VAC capillary viscometer automatic calibration device based on computer image processing algorithm, the use of automation and intelligent application technology to achieve the automatic calibration of capillary viscometer: automatic suction, automatic recognition, automatic timing, automatic calculation, automatic report generation. 24 hours unattended, liberating manpower, saving resources.

Calibrated viscometers include four major categories: wood type, flat type, Fin type and counter-current type.

Calibration, each station can be placed in different types, different models of capillary viscometers, calibration process is independent of each other, can be asynchronous calibration, do not affect each other.

The automatic calibration device of VAC capillary viscometer is composed of precise transparent constant temperature bath, high resolution image sensor, precision lifting table, pressure control system, motion control system and algorithm processing system.

The precision transparent constant temperature bath provides a stable and uniform temperature field for the viscometer to be tested. The temperature fluctuation does not exceed ±0.01° C/h, and the temperature field uniformity does not exceed ±0.02 ° C, which conforms to the provisions of JJG 155-2016 "Working capillary viscometer". The VAC can also be used in the user's existing compliant precision transparent constant temperature bath.

The high resolution image sensor is placed outside the window of the precision transparent constant temperature bath, driven by the precision lifting table precisely controlled by the motion control system. The function of the image sensor is to quickly and accurately identify the inspected engraving line, and accurately calculate the time of the oil passing through the inspected engraving line. Based on the unique recognition algorithm, the VAC automatic calibration device can check all four categories of viscometers specified in the specification, which significantly improves the reliability of recognition and improves the timing accuracy.

The pressure control system vacuums the standard oil inside the viscometer to the appropriate position, and then allows the standard oil to flow under atmospheric pressure conditions.

Because the corresponding pressure control unit, image sensor, lifting platform, motion control unit and so on constitute a self-proclaimed system of calibration system, so each station is independent of each other, do not affect each other, so as to truly realize asynchronous calibration, improve the flexibility and efficiency of calibration.