Latest price list of Interlock used in food factory

Interlock is a smart door control solution that allows only one door to be opened at a time to prevent pressure loss and limit dust and bacteria from entering. In food factories, this device helps ensure strict hygiene procedures, meeting GMP, HACCP and ISO 22000 standards.

Summaries

1. Introduction to Interlock Systems for Food Processing Plants
2. Types of Interlock Systems
3. Comparison Table of Interlock Types
4. Latest Interlock Price List (Update 2025)
5. Factors Affecting Price
6. Recommendations for Choosing Interlocks
7. FAQ
8. CTA – Contact for Pricing & Solutions

1. Introduction to Interlock Systems for Food Processing Plants

An interlock system is an intelligent door control mechanism that allows only one door to open at a time, preventing two doors from being opened simultaneously, which could cause pressure loss or allow dust and microorganisms to enter. In food processing plants, interlocks act as “gatekeepers,” ensuring that the movement of personnel and materials strictly follows hygiene protocols.

This device is essential for maintaining quality management and food safety standards such as GMP (Good Manufacturing Practice), HACCP (Hazard Analysis and Critical Control Points), and ISO 22000. By controlling access to sensitive areas like processing rooms, packaging areas, and storage rooms, interlocks help reduce cross-contamination risks, maintain required positive/negative air pressure, and protect products from contaminants.

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Updating the latest interlock price list benefits businesses by optimizing investment planning, ensuring the selection of the most suitable solution for each plant’s scale, automation level, and quality control requirements. Accurate pricing information also helps the procurement team negotiate effectively and supports the technical team in selecting configurations that meet standards and ensure long service life.

2. Types of Interlock Systems

In the food industry, interlocks are designed in various forms to suit the scale and operational needs of each plant. Common types include:

2.1. Mechanical Interlocks

Working principle: Uses mechanical latches and locks to control door opening/closing.
Advantages: Simple, durable, does not rely on electricity, low cost.
Disadvantages: Cannot integrate alarms or record data, limited expandability.
Applications: Auxiliary areas or locations with minimal monitoring needs.

2.2. Electronic Interlocks

Working principle: Uses electronic controllers, sensors, and electromagnetic locks to manage door status.
Advantages: Programmable logic, integrates lights, alarms, and connects to monitoring systems.
Disadvantages: Depends on electricity, higher cost than mechanical types.
Applications: Main production areas, packaging rooms, airlocks requiring strict control.

2.3. 2-Door, 3-Door, and Multi-Door Interlock Systems

2-door interlock: Prevents two doors from opening simultaneously; common in single-direction changing rooms or small airlocks.
3-door interlock: Adds an extra control layer, often used at intersections between storage, processing, and packaging areas.
Multi-door interlock: Large-scale systems synchronizing all access points in the production line to ensure closed-loop operation.

2.4. Interlock with Access Control – HVAC Integration

Access control integration: Manages entry via card, PIN, or biometric authentication.
HVAC integration: Links with air conditioning and filtration systems to maintain pressure, temperature, and humidity standards.
Advantages: Enhances automation, ensures both security and environmental quality.
Applications: Large-scale food factories with stringent environmental control requirements.

3. Comparison Table of Interlock Types

Interlock Type	Operating Principle	Advantages	Disadvantages
Mechanical	Mechanical latch & lock	Durable, no electricity needed, low cost	No alarms, no data logging
Electronic	Controller & electromagnetic lock	Integrated lights/alarms, flexible programming	Electricity-dependent, higher cost
2-door	Links 2 doors, only one can open at a time	Easy installation, effective control	Not suitable for complex layouts
3-door	Sequentially linked 3-door system	Higher security, GMP compliance	Complex setup, higher cost
Access Control + HVAC	Interlock + card/PIN + HVAC	Access management, maintains environment	High investment, technical requirements

This comparison helps managers and procurement teams evaluate the pros and cons of each interlock type to choose the optimal solution for performance and cost.

4. Latest Interlock Price List (Update 2025)

Interlock Type	Price Range (VND/set)	Included Components	Common Applications
Mechanical	6,500,000 – 8,500,000	Mechanical latch, lock, door mounting accessories	Auxiliary rooms, storage, low-monitoring areas
Electronic 2-door	12,000,000 – 15,000,000	Central controller, electromagnetic lock, alarm lights/sound, door sensors	Airlocks, changing rooms, small packaging rooms
Electronic 3-door	18,000,000 – 25,000,000	Multi-door controller, electromagnetic lock, signaling system, programmable logic	Processing – packaging – storage zones
Advanced Integrated	From 30,000,000	Electronic interlock + access control (card, PIN, biometrics) + HVAC integration	Large-scale plants with strict environmental control

Note: Prices may vary depending on configuration, number of doors, additional features, and supplier. Businesses should request a detailed quote with technical drawings to ensure compliance with GMP, HACCP, ISO 22000.

See more: VCR interlock lines are popular with customers

5. Factors Affecting Price

The cost of an interlock system for a food plant depends not only on the type of equipment, but also on many technical factors and operating standards. Here are some important factors to consider:

5.1. Number of doors and complexity of the system

The more doors that need to be interlocked, the higher the cost of equipment and installation.
2-door systems are usually simpler and cheaper than 3-door or multiple-door interconnections.
Complex configurations require multi-channel controllers and in-depth logic programming, which increases the cost.

5.2. Additional features (sensors, alarms, HVAC connections)

Door sensors: Ensure the system recognizes the correct open/close status.
Alarms & signal lights: Warn when the door is opened incorrectly, increasing safety.
HVAC connection: Link to the air conditioning and air filtration system to maintain standard pressure, temperature and humidity.
Each additional feature increases the cost of equipment and programming.

5.3. Door material and usage environment

Wet, low temperature or chemical environments require corrosion-resistant materials such as 304/316 stainless steel.
Heavy or large doors require higher-load electromagnetic locks and hinges, resulting in higher prices.
Frozen food or seafood processing plants often require anti-frost solutions for interlock systems.

5.4. Industry standards (GMP, HACCP, ISO 22000)

These standards strictly regulate traffic flow, cross-contamination control and hygiene safety.
A qualified interlock system often requires additional monitoring features, storing door opening data and connecting to a quality management system.
Meeting high standards means that equipment and construction costs also increase accordingly.

See more: What is Cleanroom Airlock? A Crucial Safeguard in GMP Facilities

6. Recommendations for Choosing Interlocks

Choosing the right type of interlock not only ensures effective food safety control but also optimizes investment costs and reduces operational risks. Here are some important suggestions for businesses:

6.1. Criteria for selecting suppliers

Practical experience: Prioritize units that have implemented interlocks for food factories that meet GMP, HACCP, ISO 22000 standards.
Technical consulting ability: Can provide optimal solutions based on flow diagrams and control requirements.
Product quality: Use durable components that meet electrical safety and anti-corrosion standards.
After-sales service: Support warranty, maintenance and provide spare parts quickly.

6.2. Experience in choosing the right type for each area

Changing room, small airlock: Only need basic 2-door mechanical or electronic interlock.
Processing and packaging areas: Should use electronic interlocks with alarms and indicator lights to ensure strict compliance with procedures.
Warehouses or special areas: Can use interlocks with integrated access control to limit unauthorized personnel.
Large-scale factories: Should integrate interlocks with HVAC systems to maintain pressure and production environment.

6.3. Notes on warranty and maintenance

Warranty: Choose products with a minimum warranty period of 12–24 months.
Periodic maintenance: Check the operation of locks, sensors, lights/buzzers and controllers to ensure stability.
Replacement parts: Should choose popular types with easy-to-find accessories to reduce production downtime when repairs are needed.

See more: Airlocks and Access control

7. FAQ

7.1. Is it mandatory to use interlocks in food factories?

Not required by law, but most quality management standards such as GMP, HACCP, ISO 22000 recommend or require the installation of interlocks in strictly controlled areas. This helps reduce the risk of cross-contamination and ensures proper flow.

7.2. Should you choose mechanical or electronic for food factories?

Mechanical interlocks: Suitable for secondary areas, less monitoring required, low cost, durable.

Electronic interlocks: Suitable for main production areas, can integrate alarms, indicator lights, and connect to monitoring systems.

Advice: Combine both types depending on the location to optimize costs and ensure safety.

7.3. How long is the average installation time?

Typically 1–3 days for a 2–3 door system, depending on the complexity and existing condition of the project. Systems that integrate multiple features or multiple interlock points may take 1 week or more.

7.4. Can interlocks be integrated with magnetic card systems?

Yes. Electronic interlocks can be combined with magnetic cards, PIN codes, and biometrics for access control. This helps manage traffic flow while ensuring that only authorized personnel can enter the production area, improving security and compliance with standards.