Using a handheld dissolved oxygen (DO) meter is a straightforward process, but it requires precision and attention to detail to obtain accurate results. Here are detailed guidelines from Desun Uniwill to help you effectively use a dissolved oxygen meter:
1. Gather Equipment:
Make sure you have all the necessary equipment ready:
-Handheld dissolved oxygen meter
-Dissolved oxygen probe (sensor)
-Calibration solutions (usually 0% and 100% saturation)
-Wipes or tissue for cleaning
2. Install the Probe:
3. Calibration of the Handheld Dissolved Oxygen Meter:
Calibrating the dissolved oxygen meter is crucial for accurate readings. Calibrate before each measurement session or whenever conditions change significantly:
-Immerse the probe in a 0% saturated calibration solution. Allow the readings to stabilize.
-Adjust the meter to the correct value (usually 0% saturation) using the calibration controls.
-Rinse the probe and immerse it in a 100% saturated calibration solution.
-Again, allow the readings to stabilize and adjust the meter to the correct value (usually 100% saturation).
-Some meters might require a two-point calibration, so follow the manufacturer’s guidelines.
4. Sample Collection:
Collect a water sample in the sample container. For accurate results, ensure the sample is free from debris, air bubbles, and contaminants.
If the water is stagnant, gently stir the sample to distribute the dissolved oxygen evenly.
5. Taking Measurements:
-Immerse the dissolved oxygen probe into the water sample. Ensure the probe is fully submerged.
-Allow the readings to stabilize. This may take a few minutes, depending on the probe and the water conditions.
6. Recording Readings of Dissolved Oxygen Meter:
Once the readings have stabilized, record the dissolved oxygen concentration in units like mg/L (milligrams per liter) or ppm (parts per million).
7. Cleaning and Maintenance of Handheld Dissolved Oxygen Meter:
-After each use, rinse the probe with deionized or distilled water to remove any residue.
-If necessary, gently clean the probe’s membrane with a soft brush or tissue.
-If the readings are erratic or unusually high/low, check for air bubbles on the probe’s membrane, as they can affect readings.
-Ensure the probe is properly calibrated and that the calibration solutions are not expired.
-If the readings consistently deviate, the probe might need maintenance or replacement.
9. Additional Tips:
-Follow the manufacturer’s guidelines and instructions for your specific dissolved oxygen meter and probe model.
-Be aware of any temperature compensation requirements specified by the manufacturer.
-Avoid exposing the probe to extreme temperatures, as it can affect its accuracy.
Remember, accuracy is crucial when using a dissolved oxygen meter, especially in scientific or industrial settings. Always refer to the user manual provided by the manufacturer for specific instructions related to your equipment.
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