Introduction
Welcome to your new DEKO Auto Darkening Welding Helmet MZ350T. This manual provides essential information for safe and effective use, setup, operation, and maintenance of your welding helmet. Please read this manual thoroughly before using the product and keep it for future reference.
Safety Information
General Safety Precautions
- Always wear appropriate personal protective equipment (PPE) when welding.
- Ensure the helmet is correctly adjusted and functioning before each use.
- Do not use the helmet if any part is damaged.
- Protect the lens from scratches and impacts.
- Avoid direct exposure to welding arc without proper eye protection.
- Keep children and unauthorized persons away from the welding area.
Eye Protection
- This helmet provides protection against harmful UV/IR radiation even in the light state.
- The auto-darkening filter is designed to protect your eyes from intense light during welding.
- Never look directly at a welding arc with an unprotected eye.
Electrical Safety
- Ensure all welding equipment is properly grounded.
- Do not operate in wet conditions.
Product Features
- Auto-Darkening Filter: Automatically switches from light to dark in 1/15000 seconds upon arc strike.
- True Color Technology: Provides a realistic view of the work area, enhancing clarity and detail.
- Solar Powered with Replaceable Battery: Utilizes solar energy for primary power and a CR2032 lithium battery for backup.
- Adjustable Sensitivity and Delay: Allows customization for different welding processes and environments.
- Variable Shade Control: External knob for adjusting dark shade from DIN 9-13.
- Comfortable Headgear: Upgraded adjustable headgear with soft sponge for extended wear.
- Multi-Application: Suitable for MMA, MIG, TIG welding, and Plasma Grinding.



Components Overview
Helmet Structure
The DEKO Auto Darkening Welding Helmet consists of the helmet shell, auto-darkening filter (ADF), and adjustable headgear.

Auto-Darkening Filter (ADF)
The ADF unit contains the lens display, sensitivity control, delay control, and a replaceable CR2032 lithium battery.

Setup
Headgear Adjustment
The headgear is designed for comfort and stability. Adjust the top strap and angle knob to fit your head securely. Use the fixed knob to adjust tightness for a snug fit.

Battery Installation/Check
The helmet comes with a pre-installed CR2032 battery. Ensure it is properly seated. The solar panel charges the internal system, extending battery life. A low battery indicator will signal when replacement is needed.
Operating Instructions
Power On/Off
The helmet is always ready for use due to its solar power and automatic activation. There is no manual on/off switch. It will automatically activate when exposed to light and darken upon arc strike.
Shade Adjustment
Use the external dark shade knob to select the appropriate shade level (DIN 9-13) for your welding application. Refer to welding standards for recommended shade levels based on amperage and material.
Sensitivity Control
Adjust the internal sensitivity knob to control how easily the filter reacts to the welding arc. Higher sensitivity is suitable for low amperage TIG welding, while lower sensitivity helps prevent false triggering from ambient light.
Delay Control
Adjust the internal delay knob to set the time the filter remains dark after the welding arc stops. A longer delay is recommended for high amperage welding to protect against afterglow and eye fatigue.
Grinding Mode
When performing grinding operations, ensure the helmet is set to grinding mode (light state) to prevent the filter from darkening. This is typically achieved by rotating the external knob to the 'Grind' position or by setting the shade to the lightest possible setting (DIN 4).

Maintenance
Cleaning the Helmet
- Clean the helmet shell with mild soap and water. Avoid harsh abrasives or solvents that could damage the material.
- Clean the outer and inner protective lenses with a soft, clean cloth. Do not use abrasive cleaners or rough materials that could scratch the lenses.
Battery Replacement
The helmet uses a replaceable CR2032 lithium battery. If the low battery indicator appears or the filter fails to darken consistently, replace the battery. To replace, locate the battery compartment on the ADF unit, open it, and insert a new CR2032 battery with the correct polarity (+ side up).
Storage
Store the helmet in a dry, clean place away from direct sunlight and extreme temperatures. Prolonged exposure to heat or cold can affect the performance and lifespan of the auto-darkening filter.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Filter does not darken | Low battery | Replace CR2032 battery. |
| Filter does not darken | Arc sensors obstructed | Clean or clear sensors. |
| Filter does not darken | Sensitivity too low | Increase sensitivity setting. |
| Filter flickers | Sensitivity too high | Decrease sensitivity setting. |
| Filter flickers | Ambient light interference | Adjust sensitivity or work in a less brightly lit area. |
| Poor visibility | Protective lenses dirty/scratched | Clean or replace protective lenses. |
Specifications
| Feature | Detail |
|---|---|
| Model Number | MZ350T |
| Lens Model | DX-350D |
| View Area | 90 x 35mm (3.54" x 1.38") |
| Filter Frame Size | 110 x 90mm (4.33" x 3.54") |
| Arc Sensors | 2 |
| Switch Time | Light to dark in 1/15000s |
| Delay Adjustment | 0.1-1.0s |
| Sensitivity Control | Low-High |
| Shade Range | Light DIN4, Dark Variable 9-13 |
| Auto-darkening | Yes |
| True Color | Yes |
| Power Supply | Lithium Battery + Solar Cells |
| Battery Type | Replaceable CR2032 |
| Helmet Material | PP |
| Welding Processes | MMA, MIG, MAG/CO2, TIG |
| UV/IR Protection | DIN 16 |
| Optical Class | 1/1/1/2 |
| Item Weight | 710 g |
| Product Dimensions | 5.08 x 5.08 x 5.08 cm |

Warranty and Support
For warranty information and technical support, please refer to the contact details provided with your purchase or visit the official DEKO website. Keep your purchase receipt for warranty claims.
