1. Introduction
The SEQURE S99 Portable Soldering Iron is a high-performance, compact welding tool designed for precision soldering tasks. It features rapid heating capabilities, a wide temperature range, and multiple power input options (DC/PD/PPS) to adapt to various working environments. This manual provides essential information for the safe and effective operation, maintenance, and troubleshooting of your S99 soldering iron.
2. Safety Information
- Always wear appropriate personal protective equipment, including safety glasses, when operating the soldering iron.
- Ensure adequate ventilation in your workspace to avoid inhaling solder fumes.
- The soldering iron tip reaches very high temperatures. Avoid direct contact with skin or flammable materials.
- Use a stable, heat-resistant surface for soldering.
- Disconnect the power supply when the tool is not in use or during maintenance.
- Keep out of reach of children.
- The S99 features built-in high/low voltage alarms, high-temperature alarms, and tip sensor alarms to protect the iron from damage. Pay attention to these warnings.
3. Package Contents
Please verify that all items are present in your package:
- 1 x S99 Soldering Iron Controller
- 1 x BC2 Soldering Tip
- (Note: Power cable is not included and must be supplied by the user.)

Image: The S99 soldering iron controller and the included BC2 soldering tip.
4. Setup
- Attach the Soldering Tip: Carefully insert the BC2 soldering tip into the CNC stainless steel mounting port of the S99 controller. Ensure it is fully seated.
- Connect Power: The S99 supports DC, PD, and PPS power inputs. Connect a compatible power supply (DC9V-21V for 2.5Ω tips, DC11-21V for 5.5Ω tips) to the Type-C interface. The maximum power output is up to 150W (with 2.5Ω tip) or 75W (with 5.5Ω tip).
- Initial Power-On: Once connected, the OLED display will illuminate, showing the current temperature, protocol status, target temperature, power status, power progress bar, soldering iron mode, and supply voltage.

Image: Detailed view of the S99 soldering iron with key components labeled, including the Type-C interface, OLED display, buttons, and soldering tip.

Image: Illustration showing the S99 connected to various fast charging adapters, demonstrating its compatibility with different power protocols.
5. Operating Instructions
5.1 Temperature Control
- The S99 heats up rapidly, reaching soldering temperature in approximately 2 seconds (with a 2.5Ω, 21V power supply).
- Adjust the temperature from 122°F to 932°F (50°C to 500°C) using the control buttons. The HD OLED display provides accurate temperature readings.
- The device supports 3 modes: work, sleep, and standby. These modes help conserve energy and extend tip life.

Image: Visual representation of the S99's key features, highlighting its adjustable temperature range, fast heating, OLED display, and smart functions.
5.2 Display Orientation
- The S99 allows adjustment of the display direction for comfortable use by both right-handed and left-handed users.

Image: Demonstrates the S99's adjustable display for both right-handed and left-handed operation.
5.3 Language Settings
- The S99 supports English and Russian menu switching, allowing users to select their preferred language for the interface.

Image: Screenshot of the S99's OLED display showing options for Chinese, English, and Russian languages.
5.4 Power Performance Overview
The following video demonstrates the power performance of the S99 soldering iron with various power adapters and tips. It illustrates heating times and power consumption under different conditions.
Video: "S99 Soldering Iron Performance" - This video showcases the S99's power capabilities, including its compatibility with 21V power supplies, display of soldering iron tips, resistance measurements, and heating performance with different tips and power sources. It also demonstrates menu switching and firmware upgrade potential.
6. Maintenance
- Tip Cleaning: Regularly clean the soldering tip using a damp sponge or brass wool to remove excess solder and oxidation. This ensures efficient heat transfer and prolongs tip life.
- Tip Tinning: After cleaning and before storage, always tin the tip with a thin layer of solder to prevent oxidation.
- Storage: Store the soldering iron in a dry, safe place when not in use. The auto-sleep feature helps protect the tip during idle periods.
- Firmware Upgrades: The S99 supports firmware upgrades. Connect the soldering iron to a computer to update its firmware. This allows for continuous improvement and new functions.

Image: The S99 soldering iron connected to a computer, illustrating the firmware upgrade process.

Image: Depiction of the S99's auto-sleep and inductive wake-up function, showing it entering sleep mode when not in use.
7. Troubleshooting
- Iron not heating: Ensure the power supply is correctly connected and provides sufficient current. Check the soldering tip for proper seating. Verify the power supply protocol settings on the device.
- Temperature fluctuations: Ensure the soldering tip is clean and properly tinned. Check for stable power input.
- Alarms: The S99 has dynamic detection with high/low voltage alarms, high-temperature alarms, and wrong tip alarms. If an alarm sounds, check the display for the specific error message and address the issue (e.g., change power supply, allow to cool, replace tip).
- Display issues: If the display is not functioning correctly, try disconnecting and reconnecting the power. If issues persist, consider a firmware update.

Image: Illustrates the S99's dynamic detection system, which warns users of high/low voltage, high temperature, or incorrect tip usage.
8. Specifications
| Feature | Detail |
|---|---|
| Brand | SEQURE |
| Model | S99-BC2 |
| Power Input | DC9V-21V (2.5Ω), DC11-21V (5.5Ω) |
| Max Power | Up to 150W (with 2.5Ω tip), 75W (with 5.5Ω tip) |
| Temperature Range | 122°F - 932°F (50°C - 500°C) |
| Display | HD OLED |
| Special Features | Fast Heating (2s), Safety Alarms (high/low voltage, high temp, tip sensor), 3 Modes (work, sleep, standby), User-friendly Design, CNC Stainless Steel, Firmware Upgradable |
| Dimensions | 6.5 x 0.55 x 0.59 inches |
| Weight | 1.44 ounces |

Image: The SEQURE S99 Portable Soldering Iron, showcasing its sleek design and OLED display.

Image: Table displaying heating data test results for the S99, showing performance with different resistance values, working voltages, currents, and power levels.
9. Warranty and Support
For detailed warranty information and customer support, please refer to the official SEQURE website or contact your retailer. A digital version of this instruction manual is available for download on the product page where you purchased the item.
- Protection Plans: Extended protection plans may be available for purchase. Please check the product listing for options such as 3-Year or 4-Year Protection Plans.
- User Manual (PDF): An official PDF user manual is available for download. Download PDF Manual





