Treasure Hunter GX850 Metal Detector User Manual

1. Introduction

The Treasure Hunter GX850 is a professional-grade, high-sensitivity, waterproof metal detector designed for enthusiasts and professionals alike. It features an adjustable stem, a clear LCD display, and the ability to distinguish between different types of metal with distinct audio cues. Its robust design allows for use in various environments, including lawns, snow, mountains, and even underwater thanks to its IP68 waterproof search coil. The detector offers two primary detection modes: Coin Treasure Mode for common items and Prospecting Mode for gold nuggets and relics.

2. Package Contents

Please check the box for the following items:

• 1 x Treasure Hunter GX850 Metal Detector Unit
• 1 x 9V Battery
• 1 x Waterproof Cover for the LCD Screen
• 1 x User Manual (this document)

Image: The GX850 Metal Detector with its 9V battery and waterproof LCD cover.

3. Product Overview

3.1 Component Diagram

Image: Exploded view of the GX850 Metal Detector showing its main parts.

1. ARC Stand (Armrest)
2. Headphone Jack
3. Battery Compartment & Speaker
4. Waterproof Search Coil (13-inch DD)

3.2 Control Panel Layout

Image: Detailed diagram of the GX850 control panel and its functions.

• Singal: Signal strength indicator.
• Earphone Jack: For connecting headphones.
• Power (ON/OFF/GAIN): Turns the unit on/off and adjusts sensitivity (gain).
• GG/Pinpoint: Button to narrow the target location and pinpoint it.
• Voice Recognition/Target DIS: Displays target identification and provides voice feedback.
• Depth: Indicates target depth with 4 levels of tone volume.
• Error Can't GG: Error indicator, likely related to ground balance or pinpointing.
• Battery Indication: Shows current battery level.
• Mode Selection (MODE): Toggles between ALL Metal mode and DISC (Discrimination) mode. In DISC mode, adjust discrimination level from 10-40. In ALL Metal mode, adjust Ground Balance from 0 to 99.9.
• Screen Light: Activates the LCD backlight.

4. Setup and Assembly

Follow these steps to assemble your Treasure Hunter GX850 metal detector:

1. Attach the Search Coil: Securely connect the 13-inch DD waterproof search coil (4) to the lower stem. Ensure the cable is wrapped snugly around the stem.
2. Connect the Stems: Connect the lower stem to the middle stem, and then the middle stem to the upper stem, ensuring they lock into place.
3. Mount the Control Unit: Attach the control unit (display panel) to the upper stem.
4. Install the Armrest: Slide the ARC Stand (armrest) (1) onto the upper stem and adjust it for comfortable use.
5. Install the Battery: Open the battery compartment (3) on the control unit. Insert the included 9V battery, ensuring correct polarity. Close the compartment securely.

Image: The durable USB rechargeable 9V Lithium-ion battery included with the GX850.

Adjusting Length: The detector's stem is adjustable from 42 to 52 inches. Loosen the locking collars, extend or retract the stem to your desired length, and then tighten the collars to secure it.

5. Operating Instructions

5.1 Power On/Off and Sensitivity

To power on the detector, rotate the POWER/GAIN knob clockwise. Continue rotating to increase the sensitivity (GAIN). Rotate counter-clockwise to decrease sensitivity or turn off the unit.

5.2 Detection Modes

The GX850 offers two main detection modes, selectable via the MODE button:

• ALL Metal Mode: Detects all types of metal. This mode is ideal for general searching and when you want to find any metallic object. In this mode, you can adjust the Ground Balance (GND BAL) from 0 to 99.9 to compensate for mineralized soil.
• DISC Mode (Discrimination Mode): Allows you to filter out unwanted metals (junk) and focus on specific targets. In this mode, you can change the discrimination level (THERSHOLD) from 10 to 40. Higher numbers typically reject more ferrous metals.

5.3 Ground Balance

Ground Balance is crucial for stable operation, especially in mineralized ground. In ALL Metal Mode, use the controls to adjust the Ground Balance setting from 0 to 99.9. Refer to the display for the current GND BAL value. Proper ground balance minimizes false signals caused by ground minerals.

5.4 Pinpoint Function

Once a target is detected, press the GG/PINPOINT button to narrow down its exact location. This function helps you precisely locate the target before digging, reducing the size of the excavation needed.

5.5 Audio and Visual Indicators

• LCD Display: Provides visual information such as signal strength, target ID, depth, battery indication, and current mode settings.
• Voice Recognition/Target DIS: The detector provides audio feedback, and the display shows target identification to help you determine the type of metal detected.
• Depth Indication: The display shows target depth using 4 levels of tone volume.
• Earphone Jack: Connect headphones to the 1.2-inch earphone jack for clearer audio signals and to avoid disturbing others.

5.6 Screen Light

Press the SCREEN LIGHT button to activate the LCD backlight for improved visibility in low-light conditions.

5.7 Waterproof Search Coil

The 13-inch DD search coil is IP68 waterproof, allowing for detection in shallow water, rivers, and beaches. Ensure the control unit is not submerged unless explicitly stated as waterproof for the entire unit.

Image: Examples of metal objects that can be detected by the GX850.

Image: The IP68 waterproof coil allows for underwater detection.

Image: The GX850 is suitable for use in diverse environments including beaches, forests, and historical sites.

6. Maintenance

• Cleaning: After each use, especially in sandy or muddy conditions, wipe down the detector with a damp cloth. The search coil can be rinsed with fresh water due to its IP68 rating, but avoid submerging the control unit unless it is specifically designed for full submersion.
• Battery Care: Always remove the 9V battery if the detector will not be used for an extended period to prevent leakage. Recharge the battery as needed.
• Storage: Store the detector in a dry, cool place away from direct sunlight and extreme temperatures. Disassemble the stem if necessary for compact storage.
• Cable Inspection: Periodically check all cables and connections for wear or damage.

7. Troubleshooting

8. Specifications

9. User Tips

• Practice Makes Perfect: Start by burying a few known metal objects (coins, rings) in your backyard and practice detecting them. This helps you get familiar with the detector's responses and settings.
• Sweep Slowly: For best results, sweep the search coil slowly and steadily over the ground. Rushing can cause you to miss targets.
• Use Headphones: Headphones can help you hear faint signals that might be missed with the built-in speaker, especially in noisy environments.
• Adjust Sensitivity: If you experience excessive false signals, try lowering the sensitivity (GAIN). Conversely, if you're not finding targets, increase it.
• Proper Ground Balance: Always perform a ground balance procedure when moving to a new search area or if the ground conditions change significantly. This ensures accurate detection and reduces false signals from ground mineralization.
• Target Identification: Pay attention to both the audio tones and the visual target ID on the LCD screen to better identify potential finds and avoid digging up junk.

10. Warranty and Support

Your Treasure Hunter GX850 Metal Detector comes with the following:

• 12 Months Warranty: All products from our store are covered by a 12-month warranty from the date of purchase.
• 30 Days Return: You may return the product within 30 days if you encounter any quality problems.

For any questions or support needs, please contact our customer service. All messages will be replied to promptly during working hours.

Image: Summary of warranty and service terms.