Penicillin bottle residual oxygen meterThe operation should follow the standardized process of "preparation calibration sampling testing data recording", with the core being to ensure the accuracy and reliability of residual oxygen data through precise control of sampling methods and testing parameters, and to meet the testing needs of the pharmaceutical industry for the sealing of penicillin bottles and the stability of drug solutions.
1. Preliminary preparation: Confirm the equipment status and sample conditions
Before operation, it is necessary to eliminate equipment malfunctions and sample interference to lay the foundation for detection.
Equipment inspection: Connect the power, turn on the instrument, wait for the self-test to complete (usually 1-2 minutes), confirm that the display screen has no errors (such as "sensor failure" or "air circuit leakage"), and if there are errors, first troubleshoot and repair them (such as replacing the sensor or checking the air circuit connection).
Sample preparation: Select the penicillin bottle to be tested, confirm that the bottle body is not damaged, the sealing cap is not loose, and the sample has been allowed to stand under standard conditions (such as cooling to room temperature after sterilization to avoid temperature fluctuations affecting the test results). 3-5 samples from the same batch need to be randomly selected for parallel testing.
Consumables preparation: According to the specifications of the penicillin bottle (such as 10mL, 20mL), install a suitable puncture needle (to avoid insufficient sampling caused by too thin a needle and air leakage caused by too thick a needle), and prepare dust-free paper for cleaning the needle and equipment surface.
2. Equipment calibration: Ensure accurate detection standards
Calibration is a crucial step in ensuring data reliability and should be performed regularly (such as before the first use of the device), and cannot be omitted.
Zero point calibration: Connect the instrument's built-in "zero oxygen standard gas" (usually high-purity nitrogen, oxygen content ≤ 0.1%) to the calibration interface, turn on the calibration mode, wait for the instrument to automatically read and store the zero point value, and after calibration is complete, it will display "Zero point calibration successful".
Span calibration: Replace the "span standard gas" (usually air with an oxygen content of 20.9% or a standard mixture of known concentrations), repeat the calibration operation, and the instrument will automatically calculate and correct the detection deviation to ensure accuracy within the detection range (generally requiring an error of ≤± 0.1%).
Calibration record: After the calibration is completed, fill in the equipment log or paper record form with the calibration time, standard gas concentration, and calibration results. If the calibration fails (such as deviation exceeding the range), check whether the standard gas has expired and whether the gas path is leaking. After repair, recalibrate.
3. Sampling and testing: standardize operations to avoid data distortion
The sampling process needs to control the puncture position, speed, and air path sealing to prevent external air from entering and affecting the residual oxygen value.
Sample fixation: Place the penicillin bottle into the sample fixation fixture of the instrument, adjust the fixture position according to the height of the bottle body, ensure that the bottle body is vertical and stable, and avoid needle displacement caused by shaking during the detection process.
Puncture sampling: Turn on the "detection mode", and the instrument will automatically drive the puncture needle to vertically puncture from the center position of the penicillin bottle seal cap (manual operation of the model requires slow downward pressure of the needle to avoid damaging the bottle body with excessive force). After puncture, the instrument will automatically extract the headspace gas from the bottle (the sampling volume is usually 0.5-1mL, adjusted according to the instrument model).
Gas path balance: After sampling, wait for 10-30 seconds to allow the extracted gas to fully balance in the detection gas path, avoiding fluctuations in detection values due to uneven gas mixing. Some high-end models will automatically complete gas path balance without manual waiting.
4. Data reading and recording: Complete the detection loop
After the testing is completed, it is necessary to promptly read the data, judge the results, and make records and sample processing.
Data reading: After the instrument completes the detection, the display screen will directly show "oxygen content percentage" (such as 0.8%), and some models will also display "carbon dioxide content" (if equipped with multi-component detection function). It is necessary to confirm whether the data is stable (without continuous jumping), and if it is unstable, it needs to be resampled for testing.
Result judgment: Compare with industry standards or enterprise internal control standards (such as the requirement of residual oxygen value ≤ 1.0% for injection penicillin bottles), judge whether the sample is qualified. Unqualified samples need to be marked and stored separately, and the cause can be traced later.
Recording and cleaning: Fill in the sample batch, testing time, residual oxygen value, and qualification status in the testing record form. After completion, remove the penicillin bottle, clean the puncture needle with dust-free paper, turn off the instrument power, and if not in use for a long time, disconnect the power and cover it with a dust cover.
In conclusion,Penicillin bottle residual oxygen meterThe core of the operation is "calibration first, standardized sampling, and precise recording", and each step needs to revolve around "avoiding external interference and ensuring data accuracy". Especially in the pharmaceutical industry, standardized operation can not only ensure the stability of the drug solution, but also meet the compliance requirements of GMP and other regulations for the testing process.