The glass bottle heat-resistant impact tester is the core equipment for evaluating the ability of glass containers to withstand sudden temperature changes. Its calibration must strictly follow standardized procedures to ensure the accuracy and reliability of test results. The following is a detailed explanation of calibration methods based on current international standards and industry practices:
1、 Preparation before calibration
Environmental condition control
The laboratory temperature should be stable at (20 ± 5) ℃, humidity should be ≤ 75%, and there should be no strong magnetic field interference to avoid the influence of environmental factors on the precision temperature control system.
The power supply needs to be equipped with a voltage regulator to ensure that voltage fluctuations do not exceed ± 10%.
Instrument status check
Confirm the normal operation of the vacuum system, circulating water system, and leakage protection device, and check the oil level and coolant storage of the vacuum pump.
Verify the sealing of the sample chamber to ensure that key components such as the objective lens and detector are securely installed.
2、 Core parameter calibration
Temperature system calibration
Sensor calibration: Use a certified standard thermometer (accuracy ± 0.1 ℃) to compare the actual temperatures of the high-temperature and low-temperature tanks, adjust the temperature control module to make the displayed value deviate from the standard value by ≤± 0.5 ℃.
Temperature difference accuracy verification: Set a specific temperature difference (such as 150 ℃), monitor the temperature change curve in real time through thermocouples, and ensure that the cold and hot tank conversion time is ≤ 11 seconds and the temperature fluctuation range is ≤± 1 ℃.
Timing system calibration
Use a high-precision stopwatch to verify the timing accuracy of the heating, transfer, and cooling stages. Repeat the test three times and take the average, with an error controlled within ± 1 second.
Mechanical transmission calibration
Check the positioning accuracy of the sample transfer device to ensure that the movement path of the glass bottle from the high temperature tank to the low temperature tank is unobstructed, and the immersion depth meets the standard requirements (such as immersion below the bottleneck).
3、 Performance validation and testing
Standard sample testing
Select standard glass bottles with known heat shock resistance strength (such as samples that comply with YBB00182003-2015), conduct simulation tests according to the method of Pharmacopoeia 4019, record the damage rate and compare it with the theoretical value, with an error of ≤± 2%.
Verification of data recording function
Check if the equipment can fully record temperature change curves, time parameters, and rupture events, and generate non modifiable reports that comply with GMP requirements through the built-in display screen or export function.
4、 Daily maintenance and resumption cycle
preventive maintenance
Clean the hot and cold water filters weekly to prevent impurities from blocking the pipelines; Check the corrosion of the stainless steel inner wall of the heating tank every month and replace it if necessary.
Replace the vacuum pump oil every quarter, and have the core component performance comprehensively tested by a professional organization annually.
Suggestions for the Resumption Period
It is recommended to calibrate every 6 months under regular use; If high temperature difference (>100 ℃) samples are frequently tested or data drift exceeds the limit, it needs to be shortened to 3 months.
The calibration of the glass bottle heat-resistant impact tester needs to go through the entire process of "environmental control parameter calibration performance verification continuous maintenance", combined with the requirements of pharmacopoeia 4019, GB/T 15724 and other standards, to ensure that the equipment is in the best working condition through multidimensional technical means.