User Manual Q&AAnswer
Feb 20, 2025 - 09:15 PM
To calibrate the APERA TN420 Portable Turbidity Meter, follow these steps:
1. Prepare for Calibration:
- Make sure you have the appropriate calibration solutions: AMCO Polymer solution or Formazin Solution in 0, 20, 100, 400, and 800 NTU (FNU).
- Replace the zero turbidity solution by unscrewing the cap of the 0.0 NTU calibration vial, rinsing it with distilled water, and then adding new AMCO 0.0 NTU calibration solution or fresh laboratory distilled water.
2. Clean the vial surface:
- Apply a small drop of silicone oil on the surface of the vial and wipe it off with a lint-free cloth to evenly distribute the silicone oil on the surface.
- Make sure not to use too much silicone oil, and wipe off any excess with filter paper or high-quality tissue paper.
3. Perform Calibration:
- Power on the instrument and place the 0.0 NTU calibration vial in the sample vial holder.
- Press the calibration button to enter the calibration menu and select the 0 NTU calibration point.
- Follow the on-screen instructions to complete the calibration.
- Repeat the process for the other calibration points (20 NTU, 100 NTU, 400 NTU, and 800 NTU) using the appropriate calibration solutions.
4. Verify Calibration:
- After calibration, you can verify the calibration points for accuracy. The acceptable accuracy ranges for each calibration point are provided in the manual.
Note: It is important to clean the vial and apply silicone oil before each calibration and measurement to ensure accurate results.
For more detailed instructions and illustrations, please refer to the APERA TN420 Portable Turbidity Meter Instruction Manual.
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