1、 Use core prerequisites
PSS photoresist particle size analyzerBefore use, it is necessary to confirm that the instrument is compatible with the tested sample (such as matching the particle size range of the sample with the detection range of the instrument, usually 0.1-1000 μ m), and that the laboratory environment meets the requirements: temperature of 20 ± 5 ℃, humidity of 40% -60%, avoiding airflow, vibration, and direct sunlight to prevent affecting the detection accuracy. At the same time, check the stability of the instrument power supply and ensure that the pipeline connections are not loose or leaking.
2、 Basic operation steps
Power on preparation: Connect the power to the host, computer, and detector, start the operating software, and wait for the instrument to complete self-test (the software displays a "ready" status and the indicator light is green). Then start the circulation pump and let the sheath fluid circulate in the pipeline for 5-10 minutes to discharge the bubbles in the pipeline.
Sample preparation: Prepare samples according to the standard based on the sample type (solid powder, suspension) to ensure uniform dispersion and avoid agglomeration. For samples that are prone to aggregation, an appropriate amount of dispersant can be added and sonicated (the sonication time can be adjusted as needed, usually 3-5 minutes).
Parameter setting: Enter the sample information (name, batch number) in the operating software, and set the detection parameters according to the detection requirements, including particle size range, detection time (usually 30-60 seconds), sheath fluid flow rate (according to the instrument's default recommended value), and data saving path.
Sample testing: Pour the prepared sample into the injection cup, turn on the injection pump, and adjust the injection flow rate to a stable state (to avoid bubbles caused by too fast flow rate). After the software displays a stable particle count, click "Start Detection" and the instrument will automatically collect and analyze data.
Shutdown and Closing: After the inspection is completed, rinse the pipeline 3-5 times with purified water, and then rinse 1-2 times with anhydrous ethanol to ensure that there is no sample residue in the pipeline. Turn off the injection pump and circulation pump, wait for the pipeline to be emptied, then turn off the software, host, and computer power in sequence, clean the injection cup and other consumables, and return them to their original positions.
3、 Precautions for use
Sample preparation must strictly follow dispersion requirements, as agglomerated particles can lead to larger test results. It is recommended to observe the dispersion state of the sample under a microscope before testing.
The sheath fluid needs to be filtered with a specialized filter and replaced regularly (usually every two weeks or immediately if turbidity is detected) to avoid impurities blocking the pipeline or contaminating the detector.
If there is a blockage in the pipeline during the detection process, the machine should be stopped immediately and the pipeline should be cleaned with a special dredging needle. It is forbidden to forcefully pass the liquid to avoid damaging the instrument.
PSS photoresist particle size analyzerWhen not in use for a long time, it is necessary to thoroughly rinse the pipeline with anhydrous ethanol before shutting down to prevent residual liquid from corroding the components.
4、 Common problem troubleshooting
No detection data: Check if the sample pump is working properly and if the sample is depleted; Check if the pipeline is blocked, and troubleshoot by flushing the pipeline; Confirm if the detector is securely connected to the host, and try unplugging the connection cable again.
Large data fluctuations: Confirm that the sample is evenly dispersed and can be re sonicated for dispersion; Check if the sheath fluid flow rate is stable and adjust it to the recommended value; Check for vibration or airflow interference in the environment, close doors and windows, and secure instruments.
Abnormal particle size result: Verify whether the sample preparation is standardized and whether there is agglomeration; Check if the instrument has been calibrated. If it has not been calibrated, it should be calibrated in a timely manner; Confirm whether the detection range matches the actual particle size range of the sample.