A dust sensor is an important instrument used to measure the concentration of dust in the air. Calibration of the dust sensor is the key to ensuring the accuracy of its measurement results. There are two main calibration methods for dust sensors: zero calibration and span calibration.

Zero Calibration

Zero calibration refers to placing the dust sensor in a dust-free environment so that its measurement result is zero. Zero calibration can eliminate the errors of the sensor itself and ensure that its measurement results start from zero. The main methods for zero calibration include:

● Using an air purifier: Place the dust sensor at the air outlet of the air purifier to make its measurement result zero.

● Using a clean room: Place the dust sensor in a clean room to make its measurement result zero.

● Using zero calibration liquid: Submerge the dust sensor in zero calibration liquid to make its measurement result zero.

Span Calibration

Span calibration involves placing the dust sensor in environments with different dust concentrations, measuring the results, and comparing them with those of standard instruments to determine the calibration factor. Span calibration ensures that the dust sensor produces consistent measurement results across different concentrations. The main methods for span calibration include:

● Using artificial simulation: Simulate dust concentrations in various environments and measure them with standard instruments to determine the calibration factor.

● Using standard gas: Take measurements in environments with different dust concentrations using standard gas and verify them with standard instruments to determine the calibration factor.

Calibration of dust sensors should be performed regularly to ensure measurement accuracy. The calibration cycle should be determined based on the operating environment and frequency of use. Generally, dust sensors should be calibrated every six months or once a year.

Precautions for Dust Sensor Calibration

When performing dust sensor calibration, the following should be noted:

● The calibration environment should remain stable to avoid fluctuations in dust concentration.

● Calibration instruments should have good accuracy and stability.

● Calibration personnel should possess professional knowledge and skills.

Calibration of the dust sensor is key to ensuring measurement accuracy. Through correct calibration methods and attention to detail, the measurement results of the dust sensor can be ensured to have good accuracy and reliability.