E+H Fluorometric Dissolved Oxygen Analyzer
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The long-term measurement value of the dissolved oxygen detector in the wastewater treatment aeration tank is close to “0”; the analyzer used is E+H, and the measurement method is fluorescence-based. Since the aeration time and air volume should be adjusted according to dissolved oxygen (DO) levels, the results obtained each time are not significantly different from those obtained through sampling with a manual analyzer. However, after continuous measurement for a period of time, the reading of the analyzer will gradually decrease until it reaches “0”. Calibration in air is also basically normal. Due to factors such as dissolved oxygen levels, temperature, altitude, and salt content in the water, please analyze the possible causes and feasible measures. Thank you!
First, rule out internal causes such as wiring, debugging, and system-related issues. If there are no issues, it is recommended to contact E+H by phone, as manufacturers encounter more situations during debugging, installation, and maintenance. The likelihood of knowing would be greater.
If dissolved oxygen truly drops by 0, it means the biochemical system has completely collapsed, aerobic bacteria die, and the sludge disintegrates. If the biochemical parameters are normal, then it’s definitely a fault with the instrument. Under normal circumstances, factors such as temperature, altitude, depth of immersion, and even light exposure can affect DO levels, but they won’t drop to 0. It is recommended to contact the manufacturer to have the probe replaced and tried again
This post was last edited by sunshineda_VGMP on 2019-4-11 at 16:54. Based on your description, it seems that there is a problem with the instrument itself; the probe of the dissolved oxygen meter indeed needs to be checked, and you can consult the after-sales technical support team for this. Although dissolved oxygen is greatly influenced by temperature, pressure, and salinity, the instrument itself should have a function for automatic or manual adjustment and compensation, and the effect of these factors will not result in the values approaching zero.
Severe loss of the fluorescent cap can also lead to inability to measure or inaccurate measurements
In this wastewater treatment plant, the dissolved oxygen probe is cleaned weekly using the fluorescence method, ensuring stable and reliable performance
Come in and learn* learn*. I’ve just entered the field of analytical instruments
Keep an eye on it; I hope the final result can be made known to everyone.
Optical measurement is now recommended for dissolved oxygen; when using the fluorescence method to measure oxygen, it’s necessary to calibrate by setting the zero point in boiling water, without using the full scale. Additionally, the electrode membrane head needs to be replaced frequently