Description
The GMD-350B is a low-power, miniaturized MEMS digital VOC+temperature & humidity 3-in-1 module designed for multi-scenario environmental detection. Innovatively integrating a semiconductor gas sensor, a humidity sensor and a high-performance microprocessor, this module can accurately and synchronously detect three core environmental parameters: VOC gas concentration, temperature and humidity, realizing one-stop environmental sensing.
It boasts high sensitivity and resolution, with a detection precision of 0.01ppm and both response and recovery times of ≤60 seconds (Quick Mode), enabling rapid capture of environmental parameter changes. Equipped with strong interface compatibility, it supports UART and IIC dual digital signal output and four working modes. The interface type can be switched via the level setting of Pin 7 (floating or pull-up for IIC interface, pull-down to GND for UART interface), facilitating quick debugging and integration for users.
Adopting a 3V-5V wide voltage design, the module features low power consumption and a long service life. Its compact structure fits various narrow installation spaces, greatly shortening the design and development cycle of users' products. It is widely used in environmental safety, portable instruments, healthcare and other fields, providing reliable hardware support for equipment upgrading and scenario-based detection.
Application
- Environmental Monitoring: Suitable for indoor and outdoor environmental safety monitoring and air quality detection equipment, it real-time monitors VOC concentration, temperature and humidity parameters to provide data support for environmental assessment.
- Portable Devices: Integrated into portable gas detectors, handheld environmental monitors and other devices, it meets mobile detection needs with its low-power and miniaturized advantages.
- Healthcare: Applied to air purification equipment and smart wearable devices, it monitors indoor and surrounding VOC concentration, temperature and humidity to ensure a healthy living and usage environment.
- On-Site Control: Adaptable to automatic control systems in industrial sites, warehousing environments and other scenarios, it links and regulates equipment through detection data to ensure safe and stable on-site environments.
- Smart Devices: Embedded into smart home appliances and other products, it realizes real-time collection and feedback of environmental parameters, enhancing the intelligence level of products.
Features
- High-Precision Sensing: With high sensitivity and resolution, the VOC detection resolution reaches 0.01ppm. It accurately detects temperature and humidity, capturing subtle environmental changes to meet stringent detection requirements.
- Low Power Consumption & Long Lifespan: Adopting a low-power design, it supports 3V-5V wide voltage supply and has an ultra-long service life. No frequent replacement is needed, reducing equipment operation and maintenance costs, which is suitable for the long battery life needs of portable devices.
- Flexible Interface: Supporting UART/IIC dual interface output and four built-in working modes, the interface type can be switched via simple pin setting. It is compatible with most main control devices, enabling convenient debugging and integration.
- Miniature & Portable: With a miniaturized and compact design, it can be easily embedded into portable instruments, small monitoring devices and other products, featuring strong installation adaptability.
- Fast Response: The preheating time is ≤3 minutes, and both response and recovery times are ≤60 seconds in Quick Mode, enabling fast output of detection results and improving equipment efficiency.
- Wide-Range Adaptation: Operating in a temperature range of -20℃~50℃ and a humidity range of 15%RH~90%RH (non-condensing), it can adapt to various harsh environments and has a wide range of applications.
Specifications
| Parameter Name | Detailed Specifications |
| Model No. | GMD-350B |
| Target Gas | VOC (Volatile Organic Compounds) |
| Output Mode | UART/IIC dual interface output, supporting four working modes; Interface switching: Pin 7 floating/pull-up for IIC, pull-down to GND for UART |
| Operating Voltage | 3V-5V |
| Pre-Heat Time | ≤3 minutes |
| Response Time | ≤60 seconds (Quick Mode) |
| Recovery Time | ≤60 seconds (Quick Mode) |
| Detection Range | 0-5ppm |
| Resolution | 0.01ppm |
| Operating Temperature | -20℃~50℃ |
| Operating Humidity | 15%RH~90%RH (non-condensing) |
| Pin Requirements | Both Pin1 and Pin2 need to be connected to VCC; a 1μF capacitor must be connected between Pin3 and GND; Pin4 and Pin8 are GND; Pin5 is SDA/TXD; Pin6 is SCL/RXD |
* The description and specifications might be changed without notice. Please contact us for the latest information before placing orders.
Technical Support:
Customized technical design and function, LOGO and package are available without extra charge (including molding fee) for mass volume.
The sensors don't have sleeping mode. It can be set in program if needed.
All Winsen products go through strict inspections and tests to make sure they are 100% qualified before shipping out.
The sensor has been fully tested (not calibrated) before leaving the factory, but the module will be calibrated before leaving the factory.
However, after transportation and storage, the environment conditions change, and the surface of the sensor absorbs moisture, mixed gas, pollution matters, etc. It is recommended that customers perform aging and calibration after sensors become stable according to the program and use occasions of the whole device.
15﹪-90﹪RH without condensation,greater or less than this range or long-term high temperature and high humidity will affect the life of the sensor.
Our sensors are certified with CE, 3C, ROHS, anti-explosion, fire prevention, and coal mining safety according to different applications. And we provide assistance for new certification.
Many factors can cause the sensor to fail such as broken wires in transportation, poisoning, falling off of the sensitive material, damage to the heating wire (device), etc. Please find specific cause in each category with Winsen’s aftersales.
Winsen provides professional consultation and service before and after sales. We will recommend the best fitting sensor for your demand. If you have any problem, don’t hesitate to email us to sales@winsensor.com
Due to high volume of daily incoming emails and time zone difference, we may not be able to reply your emails immediately. But we will reply to your inquiry in 24 business hours.
