AR8406 Dissolved Oxygen Meter (Polarographic Probe)
Brand Chemical Supplies provides the AR8406, a professional-grade handheld meter designed for the precise measurement of Dissolved Oxygen (DO) and temperature. Utilizing a high-sensitivity polarographic probe, this instrument is engineered for reliability in environmental monitoring, aquaculture, and industrial water treatment where accurate oxygen levels are critical for biological stability and process control.
Technical Specifications
| Feature | Specification |
| Measurement Range (DO) | 0.0 \sim 199.9\% / 0.0 \sim 20.0 mg/L |
| Accuracy (DO) | \pm 1.5\% Full Scale |
| Temperature Range | 0 \sim 50°C |
| Resolution | 0.1 mg/L |
| Sensor Type | Polarographic (Gold-Silver Electrode) |
| Response Time | \le 45 Seconds (90\% response at 25°C) |
| Power Supply | 4 \times 1.5V Button Cell or AAA (Model dependent) |
Key Features & Benefits
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Polarographic Sensor Technology: This probe utilizes a gold cathode and silver anode immersed in an electrolyte solution. When a voltage is applied, oxygen diffusing through the membrane is reduced, creating a current proportional to the oxygen concentration. This method is highly stable and preferred for continuous field use.
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Automatic Temperature Compensation (ATC): Since oxygen solubility varies significantly with temperature, the AR8406 features an integrated thermistor that automatically adjusts the DO reading to ensure accuracy regardless of the water temperature.
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Salinity & Barometric Compensation: The meter allows for the manual input of salinity levels and atmospheric pressure. This is essential for accurate measurements in brackish water, marine environments, or high-altitude locations where oxygen partial pressure changes.
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Large Multi-Display LCD: Simultaneously displays the Dissolved Oxygen reading (in \% or mg/L) and the temperature, reducing the need to toggle between screens.
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Field-Replaceable Membranes: The sensor head is designed for easy maintenance. If the membrane becomes fouled or damaged, it can be replaced in the field within minutes, minimizing downtime.
Primary Applications
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Aquaculture & Fish Farming: Ensuring optimal oxygen levels to prevent fish stress and mortality in high-density tanks or ponds.
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Wastewater Treatment: Monitoring aeration basins to ensure that aerobic bacteria have sufficient oxygen to break down organic matter.
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Environmental Science: Assessing the health of rivers, lakes, and oceans by measuring oxygen depletion (BOD) and general water quality.
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Hydroponics: Monitoring oxygenation in nutrient reservoirs to prevent root rot and maximize plant growth.
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Boiler Feedwater: Detecting trace oxygen levels that can cause oxidation and pitting corrosion in high-pressure steam systems.
Operating & Maintenance Tips
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Probe Polarization: When first turned on, polarographic probes require a “warm-up” period (typically 5 \sim 15 minutes) to allow the current to stabilize before calibration or measurement.
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Calibration: For most applications, a “100% Saturated Air” calibration is sufficient. Simply hold the probe in moist air (just above the water surface) and initiate the calibration routine.
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Water Flow: Polarographic sensors consume a small amount of oxygen during measurement. To get an accurate reading, the water must be moving across the membrane. Gently stir the probe in the sample or ensure a minimum flow rate.
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Membrane Integrity: Ensure there are no air bubbles trapped under the membrane when filling it with electrolyte solution, as this will cause erratic readings.
Contact our water analysis team at Brand Chemical Supplies today to secure your AR8406 Dissolved Oxygen Meters and ensure the vital signs of your aquatic systems are professionally monitored.
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