Integrated Multi-parameter Sensor Operation manual
10
materials dissolved in water or small enough to be filtered, which can be used to reflect the degree of
pollution of water bodies. The ionic species dissolved in the water causes the water to be electrically
conductive, so the amount of the compound in which the ions are present can be roughly estimated by the
conductivity, and the output unit is ppm.
Because the chemical composition of different water bodies causes different ionic properties, the
conductivity cannot fully calculate the amount of TDS.
TDS Sensor Specification
Principle
Converted by conductivity
Range
0-1000 mg/L
（
K=1
）
50-500000 mg/L
（
K=10.0
）
Resolution
0.1 mg/L ~1 mg/L
（
Related to Range
）
Accuracy
±3%
2.5 Dissolved Oxygen Sensor
Principle:
Dissolved oxygen is a measure of the amount of oxygen present in a body of water and is usually referred
to as DO. The dissolved oxygen sensor is measured by fluorescence method. The top of the sensor is
covered with a layer of fluorescent substance. When the blue light emitted by the sensor is irradiated to
the fluorescent substance, the fluorescent substance is excited to emit red light, and the oxygen molecule
can carry away energy (quenching effect). Therefore, the time and intensity of the excited red light is
inversely proportional to the concentration of oxygen molecules, and the concentration of dissolved
oxygen in the water can be obtained by calculation. The appearance of the dissolved oxygen sensor is
shown in 7.
Measurement / Interference:
1.
When measuring, the air bubbles attached to the film must be avoided.
2.
The presence of chlorine can distort the measurement results (overestimating the dissolved oxygen
level).
3.
After the sensor is inserted into the measurement environment, wait for the sensor temperature to
stabilize before starting measurement.