The calibration of high-temperature viscometers is the core link to ensure their measurement accuracy, which requires systematic management based on equipment principles, standard specifications, and operational details. The following is a calibration plan based on technical specifications and practical experience:
1、 Preparation before calibration and environmental control
Equipment status check
Confirm that the power cord and connectors are intact, and that the measuring probe is free from physical damage or corrosion.
Clean the components such as the material cylinder and probe, remove residual oil stains or impurities, and avoid interfering with the calibration results.
Selection of standard materials
Select traceable standard viscosity liquids (such as standard silicone oil), whose viscosity values should cover the range to be measured and comply with temperature characteristics.
For high temperature calibration, it is necessary to match a high temperature resistant standard medium (such as a molten glass standard sample).
Temperature stability guarantee
The laboratory environment temperature should be controlled at 20 ± 5 ℃, and the humidity should be below 60%.
The high-temperature viscometer needs to be preheated for 15-30 minutes until the working temperature stabilizes.
2、 Core calibration process
Standard solution injection and temperature equilibrium
Inject the standard solution into the barrel to the specified mark to avoid bubbles adhering to the probe or inner wall.
Let it stand at a constant temperature for at least 1 hour, with a temperature fluctuation of ≤± 0.1 ℃.
Parameter Setting and Dynamic Measurement
Measure temperature, speed (such as 300r/min), and time according to the standard liquid properties.
After starting the device, record three consecutive measurements, remove any abnormal data, and take the average.
Multi temperature point calibration
Verify at temperature points such as 20 ℃, 40 ℃, and 100 ℃ for different range ranges.
3、 Data Processing and Error Determination
Total allowable error calculation
Formula: Total error=Instrument error+Standard solution error.
Result judgment rules
If the measured value falls within the range, it is qualified; Otherwise, troubleshooting is required (such as sensor aging, spring deformation).
Thixotropic fluids require reading the minimum stable value at a constant shear rate.
4、 Special scenario optimization strategy
Online calibration supplement
Portable viscosity meters can be used for comparison in industrial sites, but process parameters such as flow rate and pressure need to be monitored synchronously.
Through the above systematic calibration process, the accuracy control of the high-temperature viscometer throughout its entire lifecycle can be achieved. Suggest establishing electronic calibration records to achieve data traceability and predictive maintenance.