Import Air Quality Sensor — Buy in Bulk from Supplier in China

The AQM-300C module from Shenzhen Viewpu Technology Co., Ltd. integrates the AQS501 multi-gas sensing element for broad-spectrum detection of volatile organic compounds and specific reducing gases. The unit runs on 5.0 V DC with an 80 mA operating current and communicates via TTL-level output with built-in current limiting, using a standard XH2.54-4 pin vertical header. Its detection portfolio spans ammonia, hydrogen, alcohol, carbon monoxide, methane, propane, styrene, toluene, ethylbenzene, xylene, formaldehyde, and smoke particulates from combustion sources. The 24 x 20 x 15 mm footprint and approximately 20 g mass suit integration into compact air purifiers and ventilation controllers where space is constrained.

The AQS501 sensor element employs a metal oxide semiconductor approach with automatic baseline calibration and integrated temperature and humidity compensation to maintain output stability across the rated -10 to +40 degrees C operating range. Warm-up is specified at two minutes from cold start, with a ten-second response time and twenty-second recovery to baseline after pollutant removal. Sensitivity is characterised at 1 ppm hydrogen equivalent, with an annual drift rate of under 0.2% per year under reference conditions. A ten-year service life is claimed, which is notably long for MOS technology and should be validated against the supplier's accelerated ageing test data. The four-level pollution index (0-3) provides graded air quality indication rather than individual gas concentration readouts, which simplifies integration but limits diagnostic granularity.

Primary integration targets are air purifier OEMs, HVAC control manufacturers, and smart home device developers in the Chinese domestic and export markets. The module's low cost and standardised pinout reduce design cycle time for R&D teams. However, the absence of individual gas quantification means the sensor is unsuitable for safety-critical applications requiring compliance with workplace exposure limits for specific VOCs. Buyers should confirm whether Shenzhen Viewpu provides application notes for sensitivity tuning to target gases of interest, and whether the TTL output logic levels are compatible with 3.3 V or 5 V host microcontrollers. Packaging, MOQ, and lead time are not stated and must be negotiated directly with the supplier.

Shenzhen Viewpu Technology Co., Ltd. is located at Room 311-313, Building 10, Second Industrial Park of Guanlong Village, Nanshan District, Shenzhen, Guangdong Province, postal code 518052. The address situates the company in a light industrial zone within Nanshan, a district known for electronics manufacturing and hardware startup activity. The trust tier is 'harbor' with no response rate or average response time recorded, indicating limited transactional history on the platform. The office and light manufacturing address suggests the company may assemble or test sensor modules rather than fabricate the sensing element itself.

No information is provided on year of establishment, registered capital, employee count, production floor area, or quality management certifications. The supplier does not list major clients, export markets served, or annual turnover. For buyers evaluating partnership potential, direct outreach is essential to determine whether Shenzhen Viewpu owns the AQS501 intellectual property or sources the sensor die from a third-party wafer foundry. Request a factory tour, business licence, and any available patent or utility model documentation. The absence of response metrics means initial contact should test communication speed and technical competence before committing to volume orders.