1. Introduction
The FLIR ONE Gen 3 is a lightweight thermal imaging accessory designed to transform your compatible iOS device into a powerful thermal camera. It displays live thermal infrared imagery through the FLIR ONE iOS application, allowing users to visualize temperature differences and identify heat signatures. This device is suitable for various applications including home inspection, HVAC diagnostics, automotive analysis, and industrial use.

Figure 1: FLIR ONE Gen 3 Thermal Imaging Camera. This image shows the compact thermal camera unit with its Lightning connector, designed to attach to compatible iOS smartphones.
1.1 What's in the Box
- FLIR ONE Gen 3 Thermal Imaging Camera
- USB Charging Cable
- Protective Carrying Case
- Quick Start Guide (refer to this manual for detailed instructions)
2. Setup
2.1 Charging the Device
Before initial use, fully charge your FLIR ONE Gen 3. Connect the provided USB charging cable to the FLIR ONE device and a standard USB power adapter (not included). The charging indicator light will show the charging status. A full charge typically takes approximately 40 minutes and provides up to 1 hour of continuous use.
2.2 Downloading the FLIR ONE App
- Ensure your iOS device is connected to the internet.
- Open the Apple App Store.
- Search for "FLIR ONE" and download the official application.
- Install the application on your iOS device.
2.3 Connecting to Your iOS Device
The FLIR ONE Gen 3 connects directly to your iPhone's Lightning port. The adjustable connector allows for compatibility with many protective cases.
- Carefully align the FLIR ONE's Lightning connector with your iPhone's Lightning port.
- Gently push the FLIR ONE until it is securely connected.
- The FLIR ONE app should automatically launch or prompt you to open it.

Figure 2: Adjustable Lightning Connector. This image highlights the adjustable Lightning connector on the FLIR ONE Gen 3, which can extend up to 4mm to accommodate various phone cases.
2.4 Compatibility
This specific model of the FLIR ONE Gen 3 is designed for iOS smartphones with a Lightning port, including iPhone 14 and older models. For iPhone 15 and newer models with USB-C, a different FLIR ONE model or a USB-C to Lightning adapter may be required.
3. Operating Instructions
3.1 Basic Operation with the FLIR ONE App
Once connected, open the FLIR ONE app. The app interface will display live thermal imagery. You can switch between different color palettes, adjust settings, and capture images or videos directly from the app.

Figure 3: FLIR ONE App Interface. This image displays the main screen of the FLIR ONE application, showing live thermal feed, settings options, and controls for capturing images.
3.2 MSX® Image Enhancement Technology
The FLIR ONE Gen 3 features MSX (Multi-Spectral Dynamic Imaging) technology. This proprietary FLIR technology embosses visual details from the built-in visible light camera onto the thermal image, enhancing clarity and making it easier to identify objects and their thermal signatures. This feature operates in real-time.

Figure 4: MSX® Image Enhancement. This image demonstrates the difference between a thermal image with MSX enhancement (left) and without (right), showing how MSX adds visual detail to thermal readings.
3.3 Thermal Inspection Guides
The FLIR ONE app includes step-by-step inspection guides to assist in identifying common issues such as air leaks, moisture buildup, and insulation deficiencies. These guides help users perform accurate home inspections and other diagnostic tasks.

Figure 5: Thermal Inspection Guides. This image displays screenshots from the FLIR ONE app, illustrating the step-by-step thermal inspection guides for identifying issues like insulation problems.
3.4 Image Capture, Storage, and Reporting with FLIR Ignite™
Captured thermal images and videos can be stored directly on your iOS device. For enhanced management and reporting, FLIR Ignite™ cloud storage and reporting software is available. This platform allows for seamless uploading, editing, organizing, and sharing of thermal data from your mobile device or computer.

Figure 6: FLIR Ignite™ Cloud Storage. This image shows the FLIR Ignite cloud storage interface on both a smartphone and a laptop, demonstrating how thermal images can be accessed and managed across devices.
4. Maintenance
4.1 Cleaning the Device
- Ensure the device is disconnected from your iPhone and powered off before cleaning.
- Use a soft, lint-free cloth to gently wipe the exterior of the FLIR ONE.
- For stubborn dirt, a slightly damp cloth with mild soap can be used, followed by a dry cloth.
- Do not use abrasive cleaners, solvents, or harsh chemicals, as these can damage the device's finish or optical components.
- Avoid getting moisture into the Lightning connector or camera lenses.
4.2 Battery Care and Storage
- To prolong battery life, avoid fully discharging the device frequently.
- Store the FLIR ONE in its protective case when not in use to prevent physical damage.
- If storing for extended periods, ensure the battery is charged to approximately 50% to 70% and recharge every few months to prevent deep discharge.
- Store in a cool, dry place, away from extreme temperatures.
5. Troubleshooting
5.1 Common Issues and Solutions
| Problem | Possible Cause | Solution |
|---|---|---|
| Device not recognized by iPhone/App | Low battery, loose connection, app not updated, incompatible iOS version. | Ensure FLIR ONE is fully charged. Reconnect the device firmly. Update the FLIR ONE app to the latest version. Verify iOS device compatibility. |
| Thermal image is blurry or unclear | Dirty lens, device not calibrated, extreme temperature differences. | Clean the thermal and visual lenses with a soft cloth. Allow the device to self-calibrate (it does this automatically). Ensure the device is within its operating temperature range. |
| App crashes or freezes | Software bug, insufficient device memory, outdated app. | Close and restart the app. Restart your iPhone. Ensure your app and iOS are up to date. Clear app cache if possible. |
| Short battery life | Frequent use, old battery, improper charging. | Ensure full charge before use. Avoid extreme temperatures during operation. If battery degradation is suspected, contact support. |
5.2 Further Assistance
If you encounter issues not covered here, please refer to the official FLIR support website or contact their customer service for detailed troubleshooting and technical assistance.
6. Specifications
| Feature | Detail |
|---|---|
| Model Number | 435-0004-03-NA |
| Thermal Resolution | 80 x 60 (4,800 pixels) |
| Visual Resolution | 1440 x 1080 |
| Object Temperature Range | -4°F to 248°F (-20°C to 120°C) |
| Accuracy | ±3°C or ±5% (within 15°C – 35°C ambient, 5°C – 120°C scene) |
| Battery Life | Approximately 1 hour of continuous use |
| Charging Time | Approximately 40 minutes |
| Connectivity | Lightning connector |
| Drop Test Rating | 1.5 meters (4.9 feet) |
| Product Dimensions | 2.64 x 0.55 x 1.34 inches (67 x 14 x 34 mm) |
| Item Weight | 1.2 ounces |

Figure 7: Key Specifications. This image provides a visual summary of the FLIR ONE Gen 3's main specifications, including temperature range, thermal resolution, and battery life.
7. Warranty and Support
7.1 Product Warranty
FLIR products are designed for durability and reliability. For detailed information regarding the limited warranty covering your FLIR ONE Gen 3 device, please refer to the warranty card included with your product or visit the official FLIR website. Keep your proof of purchase for warranty claims.
7.2 Customer Support
For technical support, service, or additional product information, please visit the official FLIR support portal. You can find FAQs, software updates, and contact information for customer service representatives.
Official FLIR Website: www.flir.com/support/





