User Manual Q&AAnswer
Feb 21, 2025 - 04:33 AM
To calibrate the APERA DO8500 Portable Optical Dissolved Oxygen Meter, you will need to perform two types of calibration: saturated oxygen calibration and zero-oxygen calibration.
1. Saturated Oxygen Calibration:
- Fill the calibration sleeve with water and attach it to the probe.
- Turn on the meter and wait for the temperature and measured value to stabilize.
- Long press the key to enter the calibration mode. The CAL icon will flash.
- Wait for the stable icon to appear and press the key to calibrate.
- Once the meter displays a stable 100%, the calibration is complete.
2. Zero-Oxygen Calibration:
- This calibration is only necessary when replacing the probe or if the probe has not been used for a long period.
- Prepare 100ml of oxygen-free water by dissolving 2g of anhydrous sodium sulfite (Na2SO3) in 100ml of pure water or tap water.
- Place the probe in the oxygen-free water and wait for the temperature and measured value to stabilize. The measured value should be very low, around 0.1mg/L.
- Long press the key to enter the calibration mode. The CAL icon will flash.
- Wait for the stable icon to appear and press the key to calibrate.
It is important to note that the sensor cap of the optical DO electrode should be kept in a moist environment and should not be exposed to temperatures above 50°C. Additionally, the probe should be stored in the calibration sleeve when not in use to maintain its performance.
For more detailed instructions and information, please refer to the APERA DO8500 Portable Optical Dissolved Oxygen Meter Instruction Manual.
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