Environment Monitoring Sensors Manufacturer

Dissolved Oxygen Meter

Our RS-LDO-N01 dissolved oxygen meter is a device for measuring the concentration of dissolved oxygen in water. It adopts the principle of fluorescence measurement, does not consume oxygen, and does not require electrolytes. The dissolved oxygen measurement range is 0~20mg/L. Built-in temperature transmitter with automatic temperature compensation function.

  • Model: RS-LDO-N01
  • MOQ: 1 PCS
  • Delivery date: within 24 hours
  • Price: $125.8

About - Dissolved oxygen meter

Our dissolved oxygen sensors are divided into two types: seawater and freshwater. The calibration function provides a simpler and more convenient way to calibrate. Water dissolved oxygen meter can be widely used in water treatment, aquaculture, rivers, lakes, and seawater quality monitoring industries.

Dissolved Oxygen Probe


Power supply: DC 10~30V
Power consumption: 0.2W
Measuring principle: fluorescence method
Measuring range: 0~20mg/L (0~200% saturation)
Measurement error: ±3%FS; ±0.5°C (25°C)
Resolution: 0.01mg/L; 0.1%; 0.1℃
Response time: ≤60sec
Equipment working conditions: 0~40℃
Output mode: RS485
Fluorescent film life: 1 year in normal use
Storage conditions: -10~60℃
Electrode wire length: default 5m
Shell material: polyoxymethylene (POM), stainless steel


1. Dissolved oxygen measurement range is 0~20mg/L (0~200% saturation).
2. The Modbus communication address can be set, and the baud rate can be modified.
3. The dissolved oxygen sensor uses a wide voltage power supply, DC 10~30V can be.
4. The principle of fluorescence measurement is adopted, no oxygen is consumed, and no electrolyte is required.

5. Free cloud platform for the data view.

Dissolved Oxygen Sensor Details

Working Principle - DO meter

Fluorescence Dissolved Oxygen: Based on the quenching principle of active fluorescence by specific substances in physics.
By measuring the phase difference between the excited red light and the reference light, and comparing it with the internal calibration value, the concentration of oxygen molecules can be calculated.

Dissolved Oxygen Sensor Size
Dissolved Oxygen Sensor Principle

Calibration method - Dissolved oxygen meter

Zero oxygen standard solution preparation: prepare a beaker, pour 200mL of distilled water into the cup, then add anhydrous sodium sulfite, stirring while adding, wait until the anhydrous sodium sulfite is saturated, at this time the standard solution is considered close to 0 oxygen. 100% oxygen environment preparation: prepare a beaker, pour 200mL pure water (or distilled water) into the cup, add the air pump, and fully expose the solution to air (at least 30 minutes). Note: If the site conditions really do not allow or the use requirements are not high, you can also directly put the sensor in the air (calibration accuracy will be deviated).

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