Air Quality Sensor, High Accuracy Dust Sensor Module M702A-U For Smart Home

The M702A-U High Accuracy Dust Sensor Module is an advanced air quality sensor designed for smart home and industrial applications. It measures dust concentration and airborne particulates with high sensitivity and stability, making it ideal for monitoring indoor air quality.

Specifications:

Model: M702A-U

Function: Dust and particulate matter detection (PM2.5 / PM10)

Output: Digital / UART interface (depending on model)

Operating Voltage: 5V DC

Detection Range: 0–999 µg/m³ (typical for PM sensors)

Accuracy: High sensitivity for fine dust particles

Applications: Air purifiers, smart home devices, HVAC, IoT air monitoring

Parameters:

Note:

Preheat for more than 5 minutes for the first time.

Do not use this module in systems that involve personal safety.

Do not expose the module to high concentration organic gas for long periods of time.

Do not install the module in an environment with strong air convection.

The metal housing connects to the sensor's internal power supply, taking care not to short-circuit other external circuits or the case housing.

The best way to install the air inlet and outlet is the air outlet close to the inner wall of the user machine and connected with the outside world, and there is no shelter within 2cm around the air outlet. Air flow should be isolated between the air inlet and the air outlet to prevent the air flow from directly returning to the air inlet inside the device.

The size of the inlet and outlet of the device should not be smaller than that of the sensor.

When applied to purifier products, avoid placing the sensor directly in the air duct of the purifier, and design an independent structure space in which the sensor is placed so that it is isolated from the air duct of the purifier.

The sensor should be installed 15 to 20CM higher than the ground, otherwise the fan may be contaminated by ground dust, large dust particles such as floc, or flocs, so it is recommended to use the device to pre-filter the sensor properly.

The user should never disassemble the sensor, including the metal shielding case, to prevent irreversible damage.

Sensor data ensures consistency between manufacturers and does not use third-party instrumentation or data as a comparison standard. If the user wants the final measurement result to be consistent with a third-party detection device, the user can perform data fitting and calibration according to the actual collection result.

The sensor is suitable for ordinary indoor environments, such as user equipment used in the following actual environment, the sensor may cause excessive dust, oil accumulation, water intake, resulting in data consistency degradation:

a) annual dust concentrations greater than 300 MCG/m3 for more than 50% of the time, or greater than 500 MCG/m3 for more than 20% of the time;

b) lampblack environment; 

c) High water mist environment; 

d) outside.