Choosing a Door Frame Metal Detector (DFMD) is not simply about selecting a model with the highest number of detection zones or sensitivity levels. For 2026 procurement, buyers need to look at how the detector will be used, the number of people passing through it, the required detection performance, installation conditions, and the technical specifications mentioned in the tender.

This DFMD buying guide explains the main factors to evaluate before purchasing a walk-through metal detector, with particular focus on detection zones, sensitivity, and tender specifications.

What Is a DFMD?

A Door Frame Metal Detector is a walk-through security screening system installed at an entrance. It detects metal objects carried or worn by a person as they pass through the frame.

DFMDs are commonly considered for offices, schools, government buildings, factories, event venues, transport facilities, examination centres, and other locations where controlled entry screening is required.

Unisun offers walk-through metal detectors including the UK500 and UK600. The UK500 is available with six or 18 detection zones, while the UK600 has 18 detection zones.

Why Detection Zones Matter?

One of the first specifications to examine when following a DFMD buying guide is the number of detection zones.

Detection zones divide the walk-through area into different sections. When metal is detected, a multi-zone system can indicate the approximate area where the object has been detected. This can make secondary inspection more focused for security personnel.

For example, a detector with multiple zones can help indicate whether the detected metal is around the upper body, middle section, or lower body.

However, more zones do not automatically mean that a detector is better for every application. Buyers should consider the actual screening requirement, entrance design, expected visitor flow, and the level of localisation needed.

Unisun’s UK500 provides six or 18 detection zones, while its UK600 provides 18 zones.

Understanding DFMD Sensitivity Levels

Sensitivity determines how responsive a metal detector is to metal objects. It is therefore another important part of the DFMD buying guide.

A useful system should allow sensitivity to be adjusted according to the environment and screening requirements. Very high sensitivity without appropriate adjustment can create unnecessary alarms, particularly in environments where there may be significant electromagnetic interference or metal structures nearby.

The Unisun UK500 lists 0 to 99 sensitivity adjustment for each zone, along with continuously adjustable frequency. The product page also mentions an 18-zone sensitivity configuration with 2,000 sensitivity levels.

The UK600 lists 0 to 999 sensitivity adjustment for each zone and continuously adjustable frequency between 4KHz and 8KHz. It also includes environmental signal interference detection.

When comparing DFMD sensitivity levels, buyers should therefore look beyond the number alone. The important question is whether the system allows security personnel to configure detection appropriately for the installation environment.

What to Look for in Door Frame Metal Detector Detection Zones?

When comparing door frame metal detector detection zones, consider these factors:

Specification	What to Check
Number of zones	Whether six, 18, or another configuration suits the screening requirement
Zone adjustment	Whether individual zones can be configured independently
Alarm indication	Whether visual and audible indicators identify the detection area
Sensitivity	Whether sensitivity can be adjusted according to the zone
Interference handling	Whether the system can identify or manage environmental interference
Passenger flow	Whether the detector supports the expected number of people passing through

The right combination depends on the site. A small office entrance may not require the same configuration as a stadium, railway facility, or government building.

DFMD Tender Specifications: What Should You Include?

A major part of the DFMD buying guide is understanding how to prepare or evaluate technical specifications for procurement.

A tender should clearly describe the required performance and technical characteristics rather than relying only on a product name. The Government of India’s Department of Expenditure states that technical specifications should be precise, objective, functional, measurable, broad-based, and designed to support value for money and fair competition.

Depending on the procurement requirement, DFMD tender specifications may cover:

• Number of detection zones
• Adjustable sensitivity
• Detection technology
• Operating frequency
• Alarm indication
• Passenger counting
• Detection speed
• Environmental interference handling
• Power requirements
• Installation requirements
• Operating temperature
• Weather protection
• Warranty
• Technical support
• Required certifications or standards

The exact parameters should be based on the organisation’s operational requirements rather than adding unnecessary specifications.

DFMD GeM Specifications: What Buyers Should Check

Buyers searching for DFMD GeM specifications should distinguish between the specifications of an individual product and the requirements of a particular GeM procurement.

GeM listings and procurement conditions can change, so buyers should always verify the current product category, applicable specifications, buyer-added requirements, and bid conditions before submitting or evaluating a bid.

Do not assume that a specification from an older tender automatically applies to every 2026 procurement.

For government procurement, technical requirements should be clear and measurable. The Department of Expenditure’s procurement guidance also states that technical specifications should generally be based on national technical regulations or recognised standards where applicable, with recognised international standards considered where appropriate.

Other Features Worth Evaluating

Detection zones and sensitivity are important, but they are not the only specifications worth checking.

Passenger flow is particularly important for busy locations. Unisun’s UK500 and UK600 list an infrared passing speed of up to 60 people per minute.

Alarm visibility is another consideration. The UK500 includes visual displays for pass and alarm counts, while the UK600 provides sound and LED alarm indications and automatically counts passengers and alarm events.

Environmental conditions should also be considered. The UK500 lists IP65 weatherproofing and a stated operating temperature range, making environmental requirements relevant when selecting a suitable installation.

How to Select the Right DFMD for Your Requirements?

A practical DFMD buying guide should begin with the application rather than the product.

Start by identifying the location where the detector will be installed. Then estimate daily and peak visitor movement. Determine how much zone-level information security staff require and whether individual sensitivity adjustment is important.

Next, review the installation environment. Check available space, power requirements, temperature conditions, nearby electrical equipment, and potential sources of interference.

Finally, compare the product specifications with the actual tender or procurement document. Every required parameter should be clearly documented before purchase.

For government tenders, the tender document should also clearly specify technical requirements, quality expectations, eligibility conditions, documentation, and bid evaluation criteria.

Why Consider Unisun DFMD Solutions?

Unisun’s current security equipment range includes the UK500 and UK600 walk-through metal detectors. The UK500 offers six or 18 detection zones, adjustable sensitivity, passenger counting, visual displays, and optional features such as wheels and CCTV integration.

The UK600 provides 18 detection zones, 1,000 adjustable sensitivity levels per zone, environmental signal interference detection, passenger counting, and sound and LED alarms.

These specifications give buyers different options depending on the security environment and operational requirements.

Conclusion

A good DFMD buying guide should focus on suitability rather than simply choosing the detector with the highest specification. Detection zones, sensitivity adjustment, passenger flow, environmental conditions, alarm indication, installation requirements, warranty, and technical support all deserve consideration.

For tenders and government procurement, specifications should be clear, measurable, objective, and linked to the actual security requirement. Buyers should also verify the latest DFMD GeM specifications and tender conditions before finalising a procurement.

If you are evaluating DFMD solutions for your organisation, explore Unisun’s range of walk-through metal detectors and compare the UK500 and UK600 according to your site’s requirements. Contact Unisun to discuss the appropriate configuration and technical specifications for your security screening needs.

FAQs

1. What should I check first when buying a DFMD?

Start with detection zones, sensitivity adjustment, visitor volume, installation conditions, alarm features, warranty, and technical support.

2. How many detection zones should a DFMD have?

The required number depends on the venue, screening needs, and how precisely security personnel need to locate detected metal.

3. Why are adjustable DFMD sensitivity levels important?

Adjustable sensitivity helps security teams configure detection according to the environment and reduce unnecessary alarms during screening.

4. What are important DFMD tender specifications?

Tender specifications may cover zones, sensitivity, frequency, alarms, passenger flow, installation, warranty, standards, and technical support requirements.

5. Should buyers verify DFMD GeM specifications before procurement?

Yes. Buyers should check the latest applicable GeM category, specifications, bid conditions, and buyer requirements before procurement.