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packaging testing equipment Water Vapor Permeation Tester
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Home / Blog / How to use the water vapor transmission rate tester for testing plastics
How to use the water vapor transmission rate tester for testing plastics January 11,2021.

water vapor permeability analyzer


Experimental steps

1. Connect the gas cylinder and the "nitrogen inlet" gas path of the instrument to adjust the pressure of the pressure reducing valve between 0.1 and 0.3 MPa (no air leakage).

2. Open the air compressor, adjust the pressure of the pressure regulating valve to 1kg/cm2 and lock it (you do not need to adjust after adjustment, just open the air compressor).

3. Turn on the instrument switch. After entering the test interface, open the computer test software and click "Communication-Connect" (the computer data and the instrument data change synchronously to the normal communication).

4. Click "Temperature Control" on the computer software to start temperature control (click "System Settings-System Maintenance" on the instrument interface to set the chamber temperature).

5. Open the test chamber cover with a special wrench, drain the water in the chamber with a syringe, and then inject 25ml of distilled water.

6. Place the sample in the middle of the cavity cover evenly smeared with sealing grease (the sample has no pinhole wrinkles and stains, pay attention to the front and back of the sample), and then place the cavity cover on the cavity to tightly seal it.

7. Click "System Settings-Standby Settings" on the instrument interface, tick valve 9 and press "OK", turn the dry air knob (the dry air increases and the humidity decreases, and vice versa) to reach the required humidity for the experiment and stabilize 5-10 Minutes, then manually close the No. 9 valve.

8. Click the instrument interface to select the "Test-Run Mode-Measurement" mode, and then click the "Test" button, the A/B/C cavity data save box will pop up in sequence, fill in according to the actual situation and press "Save" to save the data.

9. In the "bypass A" stage, check whether there is air out of the air outlets A, B, and C (air out indicates normal).

10. After the test is completed, adjust the experimental curve coordinates as needed, export or print the test report.


Baseline step

1. Follow the "Experimental Procedures" for steps 1-4.

2. Click "Parameter Configuration-Calculate Parameter Setting" on the instrument interface, change the "A/B/C cavity dry gas concentration" check box to "0" and save.

3. Use a special wrench to open the test cavity cover, drain the water in the cavity with a syringe, place the baseline sample (pure aluminum, aluminum foil above 25um) in the middle of the cavity cover evenly smeared with sealing grease, and then place the cavity cover in the cavity The body is tightly sealed.

4. Click the computer software interface to select the "Test-Run Mode-Baseline" mode, and then click the "Test" button, the A, B, and C cavity data saving boxes will pop up in sequence, fill in according to the actual situation and press "Save" to save the data.

5. In the "bypass A" stage, check whether there is air out of the air outlets A, B, and C (air out indicates normal).

6. Use the "permeation" after the baseline A/B/C test as the baseline value, and fill in the "A/B/C cavity dry gas concentration" selection box on the "Parameter Configuration-Calculation Parameter Setting" page of the instrument interface And save.

Precautions

1. After opening the computer software, it is not allowed to perform "temperature control" or "test" operations in the computer software before the communication is connected. If you do it accidentally, you need to close and reopen the computer software to connect to the communication.

2. After an experimental test is completed, the computer software needs to be closed and reopened, and the "test" can be performed after connecting to the communication.

3. After the sample test is completed, there is no need to take the sample out until you replace the sample.

4. Before opening the gas cylinder, you must confirm that the pressure reducing valve is closed (rotate counterclockwise to relax), otherwise the pressure reducing valve is easily damaged.

5. Every time you change nitrogen or shut down for a long time, you need to do a baseline before doing the experiment.

6. Can not stay in high humidity (above 98) for a long time. If the humidity is too high, it needs to be adjusted in time to prevent the humidity sensor from being damaged.

7. During the test, it is found that the power is cut off and the air compressor stops supplying air, the cavity cover should be opened to drain the water, and the test should be performed in time after the power is received.


maintenance

The instrument is not used for a short time (about 3 days)

1. A sample is placed on the test cavity and sealed.

2. The air compressor works normally and provides compressed air.

3. The instrument is in the standby state (the instrument is turned on, the test is stopped, and the temperature control is turned off).


The instrument is not used for a long time (more than 10 days)

1. Follow the "baseline steps" for steps 1, 3, 4, and 5.

2. After the baseline test is completed, turn off the computer and instrument, and turn off the air compressor and nitrogen bottle.

3. If you need to move the instrument, you need to use a blind plug to plug it in time after unscrewing the metal trachea connected to the "N2 inlet".

4. During the long-term shutdown of the instrument, start the baseline test every 1 to 2 months, which can extend the service life of the instrument.

More information about water vapor transmission tester contact us directly . Guangzhou Biaoji Packaging Equipment Co.,ltd is a professional manufacturer focused on developing and producing mask testing instruments and focused on developing packaging material test instruments . and spouting machine Founded in 2002 the company has received IOS 9001 certification and recognized as high-tech enterprise and software enterprise by national authority. We hold numerous technology patents and software certificates from the national authority, and gained awards for technological progress.


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