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Model：
HD-ZMDO
Introduction：
Membrane Dissolved Oxygen Analyzer measures dissolved oxygen in water by the polarographic (membrane) method. Widely used for power plants, boiler water, wastewater treatment and environmental monitoring....
The membrane dissolved oxygen analyzer is also known as the polarographic method. The solubility of oxygen in water depends on temperature, pressure and the salinity of the water. The sensing part of the membrane dissolved oxygen analyzer consists of a gold electrode (cathode), a silver electrode (anode) and a potassium chloride or potassium hydroxide electrolyte. Oxygen diffuses through the membrane into the electrolyte and forms a measuring circuit with the gold and silver electrodes. When a polarising voltage is applied to the electrode, oxygen diffuses through the membrane, the cathode releases electrons and the anode accepts them, generating a current. According to Faraday's law, the current flowing through the electrode is proportional to the oxygen partial pressure and, at constant temperature, the current is linearly related to the oxygen concentration.
1. LCD screen with a Chinese interface, making operation simple and convenient.
2. Imported TI chip and anti-interference circuit for higher precision and greater stability.
3. Adjustable hysteresis (dead band) prevents the relay from switching too frequently.
4. Polarographic measuring principle: sensitive response and stable, reliable measurement.
5. Special membrane-coating technology excludes impurity interference and resists contamination.
6. Dual-relay upper and lower limit alarm output.
7. The sensor is temperature-compensated, which corrects the influence of temperature on the dissolved oxygen value.
8. Special functional requirements can be customised.
| Measuring range | 0–20 mg/L or 0–20 ppm |
| Resolution | 0.01 mg/L or 0.01 ppm |
| Power supply | AC 220 V / DC 24 V, input power ≥ 5 W |
| Output | RS485, 4–20 mA, relay (optional), HART protocol (optional), NB / GPRS / LORA communication (optional) |
| Protection class | IP65 (controller) / IP68 (sensor) |
| Operating temperature | 0–60 °C (non-freezing) |
| Storage temperature | −10–60 °C |
| Installation | Top-mount / top flange / side-wall / pipe / immersion |
| Controller dimensions | Wall-mounted, 156 × 150 × 85 mm |
| Cut-out size | Wall-mounted, 156 × 94 mm |
| Cable length | 10 m standard (extendable on request) |
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