1. Product Overview
The CERTEON S8601 and S8601A are portable indoor air quality monitors designed to accurately measure carbon dioxide (CO2) concentration in various enclosed environments. These devices also monitor ambient temperature and humidity, providing a comprehensive assessment of indoor air quality.
They are suitable for a wide range of applications including residential rooms, offices, classrooms, agricultural facilities, and general indoor air quality assessment.
The instrument provides visual and audible alarms when CO2 concentration exceeds preset limits, helping users maintain a healthy indoor environment.
Key Features:
- CO2 concentration measurement (400-5000 ppm)
- Temperature and humidity detection
- Switchable temperature unit: °C/°F
- Measurement hold function
- Dual-line LCD display showing CO2 levels and temperature/humidity
- Backlight color indicator: Green (normal), Yellow (elevated), Red (high concentration/warning)
- Audible alarm for high CO2 levels
- Automatic power-off function
- High precision sensor

Figure 1: CERTEON S8601 Portable Carbon Dioxide Detector
2. Models and Sensor Types
- Model S8601: Equipped with a semiconductor CO2 sensor.
- Model S8601A: Equipped with a non-dispersive infrared (NDIR) CO2 sensor, offering higher sensitivity and improved measurement accuracy.

Figure 2: S8601 and S8601A CO2 Detectors
3. Specifications
| Feature | S8601 | S8601A |
|---|---|---|
| Model Number | S8601 | S8601A |
| CO2 Sensor | Semiconductor simulation | Nondispersive infrared (NDIR) |
| Display | LCD display (two-line display) | |
| Measurement Range | CO2: 400-5000ppm Temperature: -10~70°C Humidity: 0-95%RH (non-condensing) | |
| Preheating Time | 1 min | |
| Response Time | T90 < 120S | |
| Use Environment | -10~50°C, <95%RH (no condensation) | |
| Storage Environment | -10~60°C, maximum relative humidity of 70%RH (remove battery) | |
| Battery | 3 x 1.5V AAA batteries (not included) | |
| Overall Dimension | 150*52*30mm | |
| Weight | 120g | |

Figure 3: Detailed Technical Parameters

Figure 4: Product Dimensions and Button Layout
4. Package Contents
- CO2 Detector (S8601 or S8601A model)
- User Manual (this document)
- Batteries are NOT included due to transportation regulations. Please prepare 3 x 1.5V AAA batteries.

Figure 5: Package Contents (Batteries not included)
5. Setup
Battery Installation:
- Open the battery compartment located on the back of the device.
- Install 3 x 1.5V AAA batteries according to the polarity markings inside the compartment.
- Close the battery cover securely.

Figure 6: Battery Compartment
Initial Placement:
- Place the device in the area where CO2 concentration needs to be monitored.
- Allow the device to stabilize for several minutes (typically 1 minute preheating time) before taking readings to ensure accuracy.
6. Operation
Turning On/Off:
- Press the Power button (red button with power symbol) to turn on the device.
- The LCD will display the current CO2 concentration, ambient temperature, and humidity.
- The device supports automatic shutdown.

Figure 7: Power Switch for High Precision Detection
Display and Controls:

Figure 8: LCD Display and Button Functions
- Temperature Unit Conversion: Use the °C/°F button to switch the temperature display between Celsius and Fahrenheit.
- Data Hold Function: Press the HOLD button to freeze the current reading on the display. Press again to release.
- Backlight Control: Press the Backlight key (sun symbol) to turn on/off the backlight.
- Sound Control: Press the Sound key (speaker symbol) to turn on/off audible alerts.
Reading Data and Alarms:
- Read the CO2 concentration directly from the main display line (labeled '2' in Figure 8).
- The backlight color indicates air quality:
CO2 Measurement Range Instrument Sound/Light Prompt 400-1000ppm Green backlight (Normal air quality) 1000-2000ppm Yellow backlight (Elevated concentration) 2000-5000ppm Red backlight warning, alarm warning (High concentration) >5000ppm Red backlight. Panic alarm. Display shows "H1" with continuous beeping. - If "H1" is displayed and continuous beeping occurs, the CO2 concentration has exceeded 5000 ppm. To resume normal measurement, turn off the device and restart it.

Figure 9: CO2 Level Indicators and Alarms

Figure 10: Acousto-Optic Cue Backlight
7. Storage and Maintenance
- Store the device in a dry and well-ventilated environment.
- Recommended storage temperature: -10~60°C, maximum relative humidity of 70%RH.
- Clean the exterior with a soft, dry cloth.
- Do not use solvents, alcohol, or corrosive cleaning agents.
- Avoid mechanical shock or dropping the device.
- If the device will not be used for an extended period, remove the batteries to prevent leakage.
8. Troubleshooting
- Device not turning on: Ensure batteries are correctly installed with proper polarity and are not depleted. Replace with new AAA batteries if necessary.
- Inaccurate readings: Allow the device to stabilize for several minutes after turning on. Ensure the air inlet/ventilation openings are not blocked. For long-term accuracy, it's recommended to place the unit in a well-ventilated area periodically for self-calibration.
- "H1" displayed with continuous beeping: This indicates CO2 concentration exceeds 5000 ppm. Turn off the device and restart it to resume normal measurement. Ventilate the area immediately.
- Display unstable: Replace the batteries.
9. Safety Warnings and Precautions
- This device is intended for indoor use only.
- Avoid exposure to water, high humidity, or direct sunlight.
- Do not use in environments with strong electromagnetic interference.
- Do not block the air inlet or ventilation openings.
- Do not disassemble or modify the device.
- High CO2 concentrations may cause drowsiness, headaches, or suffocation in extreme cases.
- This device is not a life safety device and must not replace certified gas detection or ventilation systems.
- Do not expose batteries to excessive heat, fire, or direct sunlight.
- Incorrect battery installation may cause leakage or explosion.
- Keep out of reach of children.
- Proper disposal: Follow WEEE Directive 2012/19/EU for electronic waste recycling. Dispose of used batteries according to Directive 2006/66/EC.
Note: The above warning information is for reference only. Final warning language must comply with the official language requirements of the destination EU country.

Figure 11: Impact of CO2 Levels on Human Health
10. User Tips
- For optimal accuracy, especially with the S8601 (semiconductor sensor), ensure good ventilation in the area being monitored.
- If using the device in a new location, allow it a few minutes to acclimate and stabilize before trusting the readings.
- Regularly check battery levels to avoid unexpected shutdowns during monitoring.
- Consider the S8601A model with the NDIR sensor for applications requiring higher precision and sensitivity.
11. Frequently Asked Questions (FAQ)
- Q: Can this CO₂ detector be used in greenhouses or agricultural environments?
- A: Yes, both S8601 and S8601A models are suitable for use in greenhouses, plant nurseries, and other agricultural settings to monitor air quality and optimize plant growth conditions.
- Q: Does the device need calibration before use?
- A: No calibration is required before initial use. The device comes factory-calibrated. However, for long-term accuracy, it's recommended to place the unit in a well-ventilated area periodically for self-calibration.
12. Warranty and Support
For any questions, technical assistance, or support regarding your CERTEON CO2 Detector, please refer to the contact information provided by your seller or on the product packaging. Keep your purchase receipt for warranty claims.
This document is provided for product instruction purposes only and does not constitute legal advice. The seller is responsible for ensuring compliance with destination market regulations, including CE marking, EMC, and RoHS requirements. A PDF version of this manual may be available for download from the product's official support page.
13. Product Video
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