Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Communication Protocol	RS485 (Modbus RTU)
Detected Parameters	PM2.5, Formaldehyde, CO2, Temperature, Humidity, VOC
Power Supply	DC 12V - 24V
Response Time	< 30 seconds for gas detection
Operating Temperature	-10°C to 50°C
Humidity Range	0% to 95% RH (non-condensing)
PM2.5 Measurement Range	0 - 1000 µg/m³
CO2 Measurement Range	400 - 5000 ppm
Enclosure Material	ABS Plastic with Ventilation Grille
Installation Type	Wall-mounted or Ceiling-suspended

6 reviews

Anonymous

Mar 31, 2026

Rating: 4/5

Reliable for office environments

We deployed ten of these in our office space. They provide real-time data that helps us manage ventilation efficiently. The only downside is the manual could be more detailed regarding register maps.

Anonymous

Mar 28, 2026

Rating: 4/5

Good value but requires calibration

The unit works well overall. I noticed the humidity reading was slightly off initially, but after a 24-hour burn-in period, it stabilized. The RS485 connection is robust.

Anonymous

Mar 25, 2026

Rating: 5/5

Excellent integration for HVAC systems

This sensor module integrated seamlessly with our building management system via Modbus. The data readings for CO2 and temperature are consistent and reliable. Highly recommended for professional installations.

Anonymous

Mar 24, 2026

Rating: 5/5

Comprehensive air quality monitoring

Love that this single device handles PM2.5, VOCs, and formaldehyde. It saves a lot of wiring compared to using separate sensors. The build quality feels solid.

Anonymous

Mar 19, 2026

Rating: 5/5

Professional grade performance

As an engineer, I appreciate the accuracy and the standard Modbus protocol support. It makes scripting and data logging very straightforward. No connectivity issues so far.

Anonymous

Mar 19, 2026

Rating: 3/5

Works but sensitive to placement

The sensor works as described, but placement is critical. If placed too close to a vent, the readings fluctuate wildly. Once moved to a representative location, performance improved significantly.

5 FAQ

Q: Does this sensor support Modbus TCP or only RTU?

A: This specific model supports Modbus RTU over RS485. For Modbus TCP, you would need an external RS485 to Ethernet gateway.

Q: Can this be powered by a standard 24V AC transformer?

A: No, this module requires DC power supply (12V-24V DC). Using AC power directly will damage the unit. Please ensure you use a rectified DC source.

Q: How do I reset the device to factory settings?

A: To reset, locate the small reset button on the PCB. Press and hold it for 10 seconds while the device is powered. The LED indicator will flash rapidly to confirm the reset.

Q: What is the warm-up time required before accurate readings?

A: We recommend allowing the sensor to warm up for approximately 3 to 5 minutes after power-on for stable temperature and humidity readings. Gas sensors may take up to 24 hours for full stabilization.

Q: Is the enclosure rated for outdoor use?

A: The standard enclosure is designed for indoor use. It is not IP-rated for rain or direct sunlight exposure. For outdoor applications, please house it in a weatherproof cabinet.

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