INKBIRDPLUS Indoor Air Quality Monitor (PTH-9C) User Manual

1. Safety Information

Please read all instructions carefully before using the INKBIRDPLUS PTH-9C Indoor Air Quality Monitor. Retain this manual for future reference.

• Do not expose the device to extreme temperatures, direct sunlight, or high humidity.
• Avoid dropping or subjecting the device to strong impacts.
• Keep the device away from water and other liquids.
• Do not attempt to disassemble or repair the device yourself. Contact qualified personnel for service.
• Use only the provided USB cable for charging.
• Ensure proper ventilation when calibrating the device.

2. Product Overview

The INKBIRDPLUS PTH-9C is a versatile 3-in-1 indoor air quality monitor designed to accurately detect Carbon Dioxide (CO2) levels, temperature, and humidity. It features a clear LCD screen with a multi-color display for easy interpretation of air quality data and includes customizable alarm functions.

Key Features:

• 3-in-1 Multifunction: Monitors Carbon Dioxide (CO2), Temperature, and Humidity.
• High Precision Sensors: Equipped with a high-precision infrared sensor for CO2 and a built-in high-performance chip for accurate readings.
• 3-Color Smart Alarm: Visual indication of CO2 concentration stages (Normal, Warning, Dangerous) with customizable alarm thresholds.
• USB Rechargeable: Features a 2400 mAh lithium battery, recommended for continuous use while charging.
• Large LCD Screen: Provides clear and easy-to-read data display with selectable temperature units (℃/℉).
• Versatile Placement: Includes a hanging hole for wall mounting and can be placed on flat surfaces.

Product Components:

Figure 1: Front view of the INKBIRDPLUS PTH-9C monitor displaying CO2, temperature, and humidity readings.

Figure 2: Back view of the monitor showing the power button, UP/DOWN buttons, hanging hole, and battery compartment.

3. Setup

3.1 Initial Charging and Power On

1. Connect the provided USB cable to the device's USB port and plug the other end into a 5V-1A USB power adapter (not included) or a computer USB port.
2. The device will automatically power on and begin displaying readings. It is recommended to keep the device plugged in for continuous operation due to the 2400 mAh lithium battery powering three sensors.
3. Allow the device to stabilize for approximately 30 seconds to obtain initial accurate readings.

Figure 3: The monitor connected via USB for charging and continuous power.

3.2 CO2 Calibration

For optimal accuracy, especially upon first use, calibrate the CO2 sensor in an open, well-ventilated environment (e.g., outdoors).

1. Ensure the device is powered off.
2. Take the device to an outdoor area with fresh air.
3. Simultaneously press and hold the three buttons on the device for 200 seconds. The display will indicate calibration in progress.
4. Once calibration is complete, the device will return to normal operation.

Figure 4: Illustration of pressing three buttons for CO2 calibration.

4. Operating Instructions

4.1 Display Information

The large LCD screen displays real-time readings for CO2 concentration, temperature, and humidity. A multi-color bar visually indicates the CO2 level status.

• CO2 (ppm): Carbon Dioxide concentration in parts per million.
• Temperature (℃/℉): Ambient temperature.
• Humidity (%): Relative humidity.
• History Graph: Displays historical CO2 data over time.

Figure 5: Detailed view of the monitor's display showing all measured parameters.

4.2 CO2 Concentration Stages and Alarm

The device categorizes CO2 levels into three stages, indicated by color changes on the display and an audible alarm when thresholds are exceeded:

• Normal Stage: 400-700 ppm (Green indication)
• Warning Stage: 700-1500 ppm (Yellow indication)
• Dangerous Stage: 1500-5000 ppm (Red indication)

Figure 6: Visual representation of CO2 concentration levels and their corresponding safety stages.

4.3 Customizing Alarm Thresholds

You can customize the CO2 concentration value at which the alarm will trigger.

1. Double-press the designated button (refer to Figure 2 for button layout) to enter the alarm setting mode.
2. Use the UP/DOWN buttons to adjust the desired CO2 alarm value.
3. Press the button again to confirm and save the setting.

Figure 7: The monitor indicating a CO2 warning alarm.

4.4 Changing Temperature Units

To switch between Celsius (℃) and Fahrenheit (℉) for temperature display, press the appropriate button (usually labeled with ℃/℉ or similar, refer to Figure 2).

4.5 Backlight Control

The device's display backlight can be turned on or off. Refer to the button functions (Figure 2) for the specific button controlling the backlight.

5. Maintenance

• Clean the device regularly with a soft, dry cloth. Do not use abrasive cleaners or solvents.
• Ensure the ventilation holes are free from dust and debris to maintain accurate readings.
• When not in use for extended periods, store the device in a cool, dry place.

6. Troubleshooting

7. Specifications

8. Warranty and Support

For warranty information, technical support, or any inquiries regarding your INKBIRDPLUS PTH-9C monitor, please refer to the contact information provided with your product packaging or visit the official INKBIRDPLUS website.