SMD1001 MEMS Formaldehyde Gas Sensor Ceramic Tube Shell Sensor Toxic Harmful Gas Detection

SMD1001 MEMS Formaldehyde Gas Sensor Ceramic Tube Shell Sensor Toxic Harmful Gas Detection

The SMD1001 is a MEMS (Micro - Electro - Mechanical Systems) semiconductor gas sensor, which is designed to accurately detect formaldehyde (HCHO) in the air. Housed in a ceramic package, it offers excellent protection against external factors such as mechanical shock, moisture, and dust, ensuring stable performance over time. This sensor is an ideal choice for applications where precise formaldehyde detection is required, including indoor air quality monitoring, industrial safety, and environmental protection.

Technical Specifications

1. Detection Capabilities:

• Detected Gas: Formaldehyde (HCHO) is the primary gas that the SMD1001 sensor can detect. It is highly sensitive to formaldehyde molecules in the air, making it effective in identifying even low - level concentrations.
• Detection Concentration Range: The sensor can measure formaldehyde concentrations ranging from 0 to 3 ppm. This wide range allows it to be used in various scenarios, from relatively clean indoor environments to areas with higher levels of formaldehyde pollution.
• Resolution: With a resolution of 0.04 ppm for formaldehyde, the SMD1001 sensor can provide detailed and accurate readings, enabling users to closely monitor subtle changes in formaldehyde levels.

2. Electrical Parameters:

• Circuit Voltage (VC): It can operate under a circuit voltage of ≤5V or 3.3V DC. This flexibility in power supply voltage makes it compatible with a wide variety of electronic circuits and systems.
• Heating Voltage (VH): The required heating voltage is 1.8 ± 0.05 V, which can be either AC or DC. Heating the sensor is essential as it activates the semiconductor material, enhancing its sensitivity and response speed to formaldehyde gas.
• Load Resistance (RL): The load resistance of the SMD1001 sensor is adjustable, and the specific value is based on the delivery report. This adjustability allows for fine - tuning of the sensor's output characteristics to meet specific application requirements.
• Heating Resistance (RH): At room temperature, the heating resistance of the sensor is measured to be 45 ± 5 Ω.
• Heating Power Consumption (PH): The heating power consumption is ≤30mW, indicating relatively low power usage during the heating process. This is beneficial for applications where power efficiency is a concern, such as battery - powered gas detection devices.
• Sensitive Body Resistance (RS): When tested in air, the sensitive body resistance of the SMD1001 sensor ranges from 10 to 500 KΩ.

3. Sensitivity and Related Parameters:

• Sensitivity (S): Defined as R0 (in air) / Rs (in 0.4 ppm formaldehyde), the sensitivity of the SMD1001 sensor is ≥1.3. This means that when the sensor is exposed to 0.4 ppm of formaldehyde, there is a significant change in its resistance compared to its resistance in clean air, enabling reliable detection of formaldehyde.
• Slope (α): The slope, which reflects the rate of change of the sensor's response with different formaldehyde concentrations, is ≤0.6 (R0.4ppm / R0.01ppm formaldehyde). This parameter helps in understanding the linearity of the sensor's response to varying formaldehyde levels.

4. Test Conditions:

• Environmental Conditions: The standard test conditions for the SMD1001 sensor include a temperature of 20 °C ± 2 °C and a humidity of 55% ± 5% RH. These conditions ensure consistent and comparable test results across different testing environments.
• Circuit Conditions: For the standard test circuit, VC is set to 5V or 3.3 ± 0.1V, and VH is 1.8V ± 0.05V. Before taking accurate measurements, the sensor requires a pre - heating time of 3 - 5 minutes to reach its optimal operating state.

5. Response and Recovery Time:

• Response Time (T₉₀): The sensor can reach 90% of its final response value within less than 15 seconds when exposed to formaldehyde gas, indicating a fast - acting characteristic that allows for quick detection of formaldehyde concentration changes.
• Recovery Time (T₁₀): After the formaldehyde gas is removed, the sensor can recover to 10% of its initial state within less than 60 seconds, ensuring that it can be ready for subsequent detections promptly.

6. Service Life:

The SMD1001 gas sensor has a service life of ≥3 years, providing long - term reliability and stability in formaldehyde detection applications without the need for frequent replacement.

Applications:

• Indoor Air Quality Monitoring: Since formaldehyde is a common indoor air pollutant that can be emitted from building materials, furniture, and cleaning products, the SMD1001 sensor can be integrated into air quality monitors to continuously check formaldehyde levels in homes, offices, schools, and other indoor spaces. This helps in ensuring a healthy living and working environment for occupants.
• Industrial Safety: In industries such as wood processing, chemical manufacturing, and furniture production, where formaldehyde is often used in the production process, the SMD1001 sensor can be installed to monitor formaldehyde emissions. This ensures compliance with safety and environmental regulations and protects the health of workers.
• Environmental Protection: For environmental research and monitoring projects focused on air quality in urban areas or near industrial sources, the SMD1001 sensor can contribute to accurate data collection on formaldehyde concentrations in the ambient air.

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