Due to individual differences in turbidity sensors, ambient light, or temperature compensation. To obtain a more accurate turbidity value, calibration must be performed prior to measurement. The specific operation method is described below.
Step 1: Install the turbidity sensor to power the sensor module. Calibrate using a standard solution of 0 NTU (or purified water or distilled water close to 0 NTU);
Step 2: Record the temperature value of the current calibration solution and record it as T-test under the condition of the sensor environment (try to avoid the error caused by the light intensity); measure and record the output voltage of the sensor module as the U test.
Step 3: calculate the voltage difference ΔU caused by the temperature difference. The measured T-test is substituted into the temperature correction formula.
△U = -0.0192X (T test -25)
Step 4: Calculate the standard voltage value of 0NTU standard solution (25 °C) U25 °C.
Step 5: Calculate the K value and substitute the calculated standard voltage value U25°C into the standard curve formula.
K = 865.68XU25°C
Step 6: Correct the standard curve formula. Substituting the calculated K into the standard curve formula.
5. Grading the turbidity using analog signals Turbidity level calibration can be performed with solutions of varying degrees of turbidity.
Using Digital Signals:
Select a specific turbidity contrast solution and adjust the potentiometer knob to the position where the D1 indicator light is just lit (ie, the threshold of high and low levels) to complete the threshold setting. The DO port of the sensor module is connected to the I/O port of the MCU for output signal judgment or connected to an external drive circuit to drive other devices.
The top of the turbidity sensor is not waterproof. It is forbidden to completely throw the turbidity sensor into the water during use. The water surface must not pass the connection between the top cover and the shell. The sensor will cause the sensor to burn out when it enters the water.
The wavelength range of the sensor photodiode receiving light is (500~1050nm). The wavelength of daylight or daylight light line will affect the receiving of the sensor's photoresistor and affect the measurement output. Daylight or direct light will increase the sensor measurement error, and the sensor should be protected from daylight or direct sunlight.
The sensor head housing should be kept clean to avoid measurement obstruction caused by contaminants.
1 x Turbidity Sensor Module for Water Quality Test TS-300B