Operating Manual of Ammonia Nitrogen Sensor
5
Temperature is a measurement of the amount of heat existing in a certain body of water, and it is
considered to be a very important single parameter, for it affects the other parameters of the water quality
and controls the metabolism of aquatic animals and plants.
The temperature sensor uses the thermistor to measure the temperature of the water. The resistance value
of the thermistor changes with temperature, and the measured resistance value can be converted into a
temperature value using a corresponding calculation formula. This formula has been programmed into the
host software, and users can directly view the real-time Celsius temperature through the software. The
temperature sensor is shown in Figure 2.
Figure 2 Temperature Sensor
Technical Specification of the Temperature Sensor
Principle
Thermistor Method
Range
0~40 °C
Resolution
0.1 °C
Accuracy
± 0.1 °C
2.2 pH Sensor
Principle
：
pH describes the pH value and basic properties of a water body. It is acidic when pH<7.0, neutral when
pH=7.0, and alkaline when pH>7.0.
The pH sensor measures the pH value of the water in the glass electrode method. It is composed of two
parts, including a glass bubble with a glass film that selectively responds to H+, inside of which it is filled
with a 0.1 mol/L HCl internal reference solution, and an internal reference electrode Ag- AgCl. When the
electrode is immersed in the solution, the difference between the stable electric potential of the reference
electrode and the electric potential generated by the glass bubble is proportional to the H+ concentration
in the solution.
The pH sensor measures data with stability, reliable performance and easy installation. Its appearance is