Blue green algae sensor

Blue green algae sensor

Monitor the content of blue-green algae through fluorescence analysis. This method directly detects the fluorescent substances of specific pigments in blue-green algae cells to determine the relative blue-green algae. The sensor adopts IP68 waterproof treatment and supports Modbus. It can be widely applied in fields such as rivers, lakes, and drinking water sources for a long time.

Advantages: • Adopting fluorescence method; Only a small distance from the obstacle is needed to avoid its impact; • Implement long-term online monitoring; Calibrated with Rhodamine solution, it has good linearity with blue-green algae.

Blue green algae sensorPrecautions for on-site installation:

1. On site, depending on the actual situation, the sensor can be fixed with a 6-point (3/4 NPT) thread or installed with accessory brackets, or other installation methods that can fix the sensor.

2. Fixed installation is preferred for installation, and drag chain installation is prohibited.

3. During installation, full consideration should be given to water flow and liquid level changes to ensure that the water flow can cross the optical path, and the sensor should be located at a depth of 10cm or more underwater.

4. The shielded wire needs to be grounded together with the equipment, and the sensor does not support hot swapping.

Calibration:

The sensor supports 1-point or 2-point calibration, and it is generally recommended to use zero point and 100ug/L (2.0mg/L Rhodamine B) blue-green algae two-point calibration.

The standard solution uses deionized water as the zero point, and a 100ug/L (2.0mg/L Rhodamine B) blue-green algae solution is used for the second point calibration.

Firstly, restore K and B values to their default values, K=1，B=0;

2. Place the sensor in deionized water (avoid direct sunlight on the light window), and read the blue-green algae value. For example, if the blue-green algae value is 0.2ug/L, record it as X.

3. Place the sensor in 100ug/L (2.0mg/L Rhodamine B) and repeat step 2, recording the value as Y.

4. Record the values of K and B using the following formula: K=1/(Y-X), B=- KX

5. Write K and B values into the sensor. Refer to the Modbus interface documentation for the writing method.