Use the A20DO online dissolved oxygen tool because it works and is customizable. Measured temperature and dissolved oxygen (DO). It shows how well municipalities clean their sewage and how much water they have. You can set the temperature and program the relays. It also has a different signal output. Anytime you want, you can change from Chinese to English. The PP1120-200 underwater sheath and TS-120-10M specialty dissolved oxygen electrode make it easy to set up, use, and trust for regular checks.
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Features
Specifications
| Category | Specifications |
|---|---|
| Measurement Range | Dissolved Oxygen (DO): 0~20mg/L, 0.0~20.0mg/L, 0.00~20.00mg/LTemperature: 0~60℃ (measurement), 0~100℃ (temperature compensation range) |
| Measurement Accuracy | DO: ±0.01ppmTemperature: ±0.3℃ |
| Resolution | DO: 0.01ppmTemperature: 0.1℃ |
| Stability | ≤0.02ppm/24 hours |
| Temperature Compensation | Dual modes: Automatic (PT1000/NTC10K) / Manual |
| Signal Output | 1 channel of 4~20mA isolated output (corresponding to DO value or temperature); optional 2 channels of 4~20mA output or RS485 Modbus RTU communication; maximum load resistance: ≤500Ω |
| Alarm Output | 2 groups of normally open contact relays (3A/250VAC), supporting high/low point alarm; 1 set of electrode automatic cleaning contact |
| Power Supply | Optional AC220V or DC24V; power consumption: ≤5W |
| Physical Parameters | Dimensions: 144×144×115mm (H×W×D)Cutout Size: 138×138mm (H×W)Mounting Type: Panel-mounted, Wall-mounted (dual modes) |
| Operating Environment | Ambient Temperature: 0~60℃Relative Humidity: ≤85%RH (no strong magnetic interference) |
Standard Configuration
- Host: A20DO
- Dissolved oxygen electrode: TS-120-5M
- Submerged electrode sheath: PP1120-200
Core Highlights
- Achieve high precision and stability with ± 0.01ppm accuracy, < 0.02ppm 24-hour stability, isolated signal output, and reliable data transmission.
- Multiple site layouts can be accommodated via embedded and wall-mounted dual installation techniques. Submerged or flow-through electrodes are suitable for sewage treatment and water supply.
- Practical and versatile: Two sets of relays support high and low point warnings, and the hysteresis can be easily adjusted to avoid frequent on-off; Electrodes automatically clean contacts, reducing manual maintenance.
- Energy-efficient and durable: ≤ 5W power consumption, environmentally friendly, suitable for long-term continuous operation; – Electrode can withstand 0-60 ℃ temperatures; – Protective casing for complex industrial environments.
Featured Applications
- Urban sewage treatment: To make sewage treatment work better, aeration tanks and secondary sedimentation tanks need to be checked all the time for dissolved oxygen levels, and aeration equipment needs to be employed.
- Water supply industry: Dissolved oxygen testing of source water from waterworks, pipeline water, and secondary water supply to ensure the safety of drinking water quality.
- Conventional environmental monitoring: small and medium-sized water quality monitoring stations, monitoring of conventional dissolved oxygen indicators in surface water.
- Other scenarios: ordinary industrial circulating water, routine monitoring of aquaculture, and other scenarios that have certain requirements for dissolved oxygen accuracy.
Daily maintenance and precautions
Maintenance points
- Electrode maintenance: Calibrate regularly (1-3 months), clean with neutral detergent when pollution is severe, and avoid using strong acids and alkalis; When not in use for a long time, it needs to be soaked in a specialized protective solution.
- Instrument maintenance: Keep the casing clean and avoid direct sunlight and corrosive environments; Check the relay contacts and wiring terminals once a year to prevent oxidation.
- Cable maintenance: Avoid pulling or bending cables. Special shielded wires should be used to extend cables, and the length should not exceed 30 meters.
Safety precautions
- Before installation and wiring, the power must be disconnected and operated by professionals to avoid the risk of electric shock.
- When connecting a relay to high-power equipment, an additional intermediate relay needs to be installed to prevent contact overload damage.
- If there is surge interference in the power supply, an independent power supply should be provided for the controller, separate from the power supply of equipment such as the dosing machine and mixer.
- The electrode installation must be well sealed with waterproofing, and it is strictly prohibited for water to enter the inside of the electrode or the wiring terminals, otherwise it may cause short circuit faults.
Technical Support
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The A20DO online dissolved oxygen controller takes “precision, stability, flexibility, and practicality” as its core, perfectly adapting to conventional dissolved oxygen monitoring scenarios such as urban sewage treatment and water supply. From dual installation mode to intelligent operation design, from high-precision measurement to low maintenance cost, it fully meets the core requirements of industrial continuous monitoring. Paired with specialized dissolved oxygen electrodes and installation kits, a complete conventional dissolved oxygen monitoring solution is formed to assist users in achieving efficient water quality control with high cost-effectiveness.
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