Installation and Maintenance Guide for Online Dissolved Oxygen Analyzers

An online dissolved oxygen analyzer is a crucial tool for monitoring water quality in applications like wastewater treatment, aquaculture, and industrial processes. Correct installation and regular maintenance are essential for getting accurate, reliable data. This guide breaks down the steps to ensure your analyzer performs at its best.

Pre-Installation: Choosing the Right Spot
Before you start, select an optimal location. The sensor should be placed in a representative flow of water, not in a stagnant area. Avoid spots with air bubbles or direct sunlight, as these can affect readings. Ensure the location is easily accessible for future cleaning and calibration.

Step-by-Step: Sensor Installation
First, gently mount the sensor into its fitting, often a flow cell or immersion assembly. Avoid grabbing the sensitive membrane tip. Connect the sensor cable to the transmitter (the reading unit). Ensure all connections are tight and protected from moisture. Finally, power on the transmitter.

The Crucial First Calibration
Calibration is key for accuracy. The most common method is a 2-point calibration: first in a zero-oxygen solution (often a sodium sulfite mix) and then in air-saturated water. Always follow your manufacturer's specific instructions. Perform this calibration after installation and whenever you notice drift in the readings.

Routine Maintenance: Keeping It Clean
The sensor membrane (the tip) needs regular cleaning. Gently wipe it with a soft cloth to remove biofilm, dirt, or debris. For tougher buildup, use a mild detergent and rinse thoroughly. Never use sharp objects or abrasive cleaners, as they can permanently damage the membrane.

When to Replace Parts: Membranes and Electrolyte
The sensor’s membrane and the electrolyte solution inside degrade over time. A typical DO probe requires membrane and electrolyte replacement every 1 to 6 months, depending on usage and the environment. Signs you need a change include slow response times, erratic readings, or failed calibrations.

Troubleshooting Common Problems
Is your reading unstable? Check for air bubbles on the membrane and clean the sensor. Is the reading always zero? Verify your calibration and check for a torn membrane. Are readings consistently low? The electrolyte might need replacing, or the sensor may be overly dirty.

Conclusion: Consistency is Key
A well-installed and maintained dissolved oxygen analyzer is a powerful asset. By following these simple steps for installation, calibration, and routine care, you will ensure long-term accuracy and reliability, protecting your process and product quality.

Need a high-quality, reliable online dissolved oxygen analyzer for your system? Explore our range of products and detailed support resources on our website to find the perfect solution for your monitoring needs.