Coil Size Matters: How It Affects the Effectiveness of Metal Detectors

Coil size plays a crucial role in the effectiveness of metal detectors. A coil, also known as a search head, is an essential component that detects and identifies metallic objects beneath the ground. The size of the coil determines how deep into the ground it can detect metals, and its sensitivity to small or large objects.

Metal detector coils come in different sizes ranging from 4 inches to 15 inches or more. Each coil size has unique advantages and limitations depending on the type of soil, target depth, and target size you are searching for.

Small Coils

Small coils have a diameter between 4-7 inches and are ideal for detecting small targets such as coins, jewelry, relics, and nuggets. These coils offer high sensitivity to small objects located close to the surface level of mineralized soil.

They have excellent maneuverability in tight spaces that larger coils cannot access easily. Small coils are perfect for areas with high trash density where larger search heads cannot differentiate between iron debris and valuable targets.

However, these smaller-sized search heads may not be effective at targeting deeper items due to their limited coverage area. If you want better depth penetration than you might need a bigger sized coil.

Medium Coils

Medium-sized search heads have diameters ranging between 8-11 inches. They offer greater coverage area than smaller ones while still providing reasonable sensitivity levels for locating small targets buried at moderate depths.

Medium-sized coils provide excellent balance between sensitivity levels for small targets like rings and coins while still maintaining good depth penetration capabilities when seeking out larger objects like swords or rifles in moderately mineralized soils.

Large Coils

Large-coiled metal detectors range from 12-15 inches in diameter offering great depth penetration compared to their smaller counterparts but less sensitive towards smaller objects closer to them which they often miss altogether because they only cover such large areas per sweep!

These types of detectors can quickly identify large treasures even buried deep underground due to their extensive coverage area and depth penetration capabilities.

However, large search heads can be cumbersome to maneuver through tight spaces or areas with high trash density. Additionally, they may not be suitable for mineralized soil or saltwater beaches due to their decreased sensitivity levels towards smaller targets.

Factors affecting coil size

1. Soil Type

The type of soil you are detecting in plays a significant role in selecting the right coil size. Mineralized soils tend to reduce the performance of metal detectors, especially those with small coils that have low sensitivity levels.

In contrast, larger coils offer better depth penetration capabilities that can overcome the effects of mineralization. A medium-sized search head is a good compromise between these two extremes but also depends on the level of mineralization present.

2. Target Size and Depth

The size and depth of your target will determine how sensitive your detector should be. Smaller objects require higher sensitivity settings compared to larger ones buried deeper underground where you need more extensive coverage areas like those offered by larger coils.

If you’re hunting for coins or jewelry near the surface level (less than 6 inches), then smaller sized coils are perfect because they provide higher resolution and sensitivity which mean there’s less chance for missing anything important!

3. Search Area

Search area also plays an essential role when considering coil size since some locations may have more obstacles than others like rocky terrain or thick vegetation where small sized coils are handy while other places with flat open fields would benefit from using large-sized search heads that cover vast distances quickly without getting caught up in bushes or trees along its way!

Conclusion

Coil size is an essential consideration when choosing a metal detector because it determines how deep into the ground you’ll detect metals as well as what types of objects you’ll find! Larger-sized search heads offer greater depth penetration capabilities while smaller ones work best within close proximity ranges like trashy areas where iron debris makes it hard for larger-sized detectors to differentiate valuable targets from junk.

Medium-sized coils are great for detecting larger targets that may have been buried deeper underground, but still offer excellent sensitivity levels towards smaller objects as well. Ultimately it comes down to personal preference and the type of environment you’ll be using your detector in – so choose wisely!