ZE08B-CH2O Electrochemical Formaldehyde Sensor Module: Core Component for High-Precision Air Quality Monitoring

The Nexisense ZE08B-CH2O module is based on mature electrochemical principles, specially designed for precise detection of formaldehyde (CH₂O) concentration in air. The module's detection range covers 0～1.6 ppm, with resolution ≤0.01 ppm, suitable for industrial and commercial scenarios sensitive to low formaldehyde concentrations.

Built-in temperature sensor enables real-time automatic compensation, ensuring measurement stability within the operating temperature range of 0℃～50℃ and non-condensing humidity of 15%RH～90%RH. Output interfaces include UART (9600 baud, 3.3V TTL level, supporting active upload and query-response modes) and analog voltage output, facilitating seamless connection with MCU, PLC or IoT gateways.

In system integration, this module is particularly suitable for embedded air purifiers, smart fresh air systems, environmental monitoring stations, and industrial plant VOC control projects. Its outstanding anti-interference performance shows low response to common cross gases such as alcohols and CO. Combined with a lifespan of up to 2 years in air, it significantly reduces long-term maintenance costs.

MED-NO Nitric Oxide Sensor: High-Reliability Solution Dedicated to Medical Exhaled Breath Detection

The MED-NO sensor adopts constant potential electrolysis technology, achieving ppb-level high-precision detection of nitric oxide (NO) in exhaled breath. The core working principle is based on the oxidation reaction of NO at the working electrode, where the generated current is directly proportional to the concentration, complying with Faraday's law. The fourth electrode (auxiliary electrode) design is used for zero-point compensation, effectively suppressing background current and environmental interference, ensuring minimal long-term zero drift.

The sensor features wide linear range, high sensitivity, and strong overload resistance with excellent repeatability, suitable for medical equipment requiring frequent sampling but low maintenance. Typical applications include FeNO (fractional exhaled nitric oxide) monitoring for asthma inflammation assessment, COPD management, and tracking the therapeutic effect of inhaled corticosteroids.

Typical Application Scenarios and Project Integration Value

Indoor Air Quality and Environmental Monitoring Systems

ZE08B-CH2O is often integrated into commercial building fresh air systems, hospital cleanroom monitoring, and smart home central control platforms. Real-time concentration data (ug/m³ or ppm) is uploaded via UART protocol, combined with multi-sensor arrays to achieve composite monitoring of TVOC, PM2.5, CO₂. In actual projects, this module has been applied in multiple large office building air optimization solutions, significantly improving IAQ index and supporting LEED certification.

Medical Respiratory Monitoring Equipment

MED-NO sensor is embedded in portable FeNO analyzers, handheld exhaled breath detectors, and hospital pulmonary function testing systems. ppb-level resolution meets ATS/ERS guideline requirements for 50 mL/s constant flow sampling, supporting clinical diagnosis and remote patient management. Typical cases include bulk integration by multiple respiratory specialty equipment manufacturers for chronic respiratory disease follow-up programs.

Both support modular design, facilitating OEM manufacturers to quickly iterate product lines and shorten time-to-market.

Selection Guide and System Integration Considerations

Key Selection Parameter Comparison

Integration Considerations

1. Power supply stability: It is recommended to use regulated 5 V power to avoid ripple affecting the electrochemical reaction current.

2. Communication protocol: ZE08B-CH2O defaults to active upload mode (one frame per second), can switch to query mode via specific command; checksum calculation must strictly follow ~ (sum +1) rule.

3. Environmental control: Avoid direct contact with organic solvents, coatings, high-concentration interfering gases; long-term storage in 0～25℃ dry environment.

4. Calibration strategy: Recommended regular zero and span calibration, especially in high humidity or drastic temperature change scenarios; MED-NO benefits from auxiliary electrode automatic compensation, calibration cycle can be appropriately extended.

5. PCB layout: Reserve gas diffusion channel to ensure sensor end face is exposed to airflow; UART pins need ESD protection to enhance system robustness.

OEM Customization and Bulk Supply Advantages

Nexisense provides services from standard modules to complete customized solutions, including:

• · Shell and interface customization (such as specific pin definitions, waterproof rating).

• · Output protocol optimization (Modbus RTU, I²C bridging, etc.).

• · Batch consistency control and traceability system, ensuring zero drift and sensitivity deviation<5% between batches.

• · Stable supply chain support, annual delivery capacity covering medium to large project demands.

These advantages help system integrators reduce development risks and achieve cost-controllable scaled production.

Frequently Asked Questions FAQ

1. 1. How does the ZE08B-CH2O module UART protocol switch between active upload and query mode?
   By sending specific commands (such as 0xFF 0x01 0x78 0x40 ... checksum 0x47 for active, 0x41 for query), default power-on is active upload, outputting one concentration frame per second.

2. 2. How does the MED-NO sensor's fourth electrode zero-point compensation improve detection accuracy?
   The fourth electrode does not contact the target gas, only responds to background interference, achieving dynamic subtraction of zero-drift current, improving signal-to-noise ratio and long-term stability at low concentrations (ppb level).

3. 3. What is the performance of ZE08B-CH2O in high-humidity environments?
   Operating humidity 15%RH～90%RH (non-condensing), built-in temperature compensation circuit can effectively correct baseline drift caused by humidity, but direct condensation should be avoided.

4. 4. What are the typical power consumptions of the two sensor modules respectively?
   ZE08B-CH2O low-power design, average current in mA level; MED-NO optimized for portable medical equipment, suitable for battery-powered scenarios, specific values subject to actual testing.

5. 5. How to handle cross-interference (such as alcohol gases) in ZE08B-CH2O?
   The sensor has certain response to ethanol, methanol, etc., but after selectivity optimization, interfering gases need to be far above the threshold to significantly affect under 5 ppm formaldehyde; system-level can further suppress through algorithm filtering.

6. 6. Does MED-NO meet the flow rate requirements for FeNO clinical testing?
   The sensor itself supports 50 mL/s standard flow rate sampling, integration requires coordination with flow control hardware to meet ATS/ERS guidelines.

7. 7. Does Nexisense provide batch test reports for bulk procurement?
   Yes, we provide statistical reports of key parameters (zero point, sensitivity, linearity) for each batch along with traceability codes, supporting quality system audits.

8. 8. What is the correspondence between ZE08B-CH2O analog output range and concentration?
   Some versions support 0.4～2 V corresponding to 0～full scale, refer to product specification sheet, convenient for ADC acquisition.

9. 9. How to reduce maintenance frequency of MED-NO during long-term use?
   Thanks to excellent repeatability and overload resistance, calibration cycle can be extended to 6-12 months, combined with regular functional self-test to maintain clinical-grade accuracy.

10. 10. Does Nexisense support joint debugging of sensors with host systems?
    Supported, providing SDK sample code, communication debugging tools, and remote technical support to help integrators quickly verify prototypes and enter mass production stage.

Conclusion

The Nexisense ZE08B-CH2O and MED-NO sensor series, with reliable electrochemical core technology, flexible interface design, and long-term stability, meet the needs of professional integrators for high-requirement gas detection projects. Whether focusing on indoor environmental governance or precise medical diagnosis, these solutions can provide solid data foundation.

If you are developing related systems or evaluating suppliers, welcome to contact the Nexisense team to discuss specific technical specifications, sample testing, or customization solutions. We look forward to cooperating with you to jointly promote the implementation of gas sensing applications.