Choosing interlocks for food manufacturing

In food processing, machinery often combines hazardous movement with the need for regular access. Operators may need to access equipment multiple times throughout a shift for cleaning or inspection, making access control a key consideration.

Hygiene requirements can also influence the choice of safety devices. Equipment used in washdown environments must withstand frequent cleaning while avoiding features that could trap contaminants or compromise cleanability.

For this reason, the materials and design of interlocking devices can be just as important as their function. Stainless steel interlocking devices are commonly used in hygienic environments because they resist corrosion and can withstand frequent cleaning. Their smooth surfaces and robust construction can also make equipment easier to clean and help reduce areas where contaminants may accumulate.

Mechanical interlocking for hygienic applications

Mechanical trapped key interlocking systems are often used on food processing equipment.

For example, operators may require access to enclosed chambers of hygienic mixers and grinding equipment used in the production of ground poultry, sausages, and formed meat products. Because internal blades operate at high speed, access must be controlled until the equipment has reached a safe state.

In these applications, trapped key systems can be configured to ensure that access is only possible when hazards have been brought to a safe state and that all guards are secured before restart is permitted.

Mechanical stainless steel interlocks are often well suited to these environments because they are robust, resistant to corrosion, and do not rely on wiring, making them suitable for harsh or wet operating conditions.

When electromechanical interlocks can be an option

Not all areas of a food processing facility are subject to the same environmental demands. While some production zones require frequent washdown, others may have different operational requirements.

In these situations, electromechanical solutions such as stainless steel interlocks with guard locking may be appropriate. These systems can also be integrated with trapped key interlocking where required.

As a result, selecting the right solution often means considering both the operational requirements and the environment in which the device will be used.

Matching the solution to the application

There is no single interlocking solution that suits every food processing application. Primary processing, secondary processing, packaging, and end-of-line operations can all present different hazards, cleaning requirements, and access needs.

Where hygienic design and regular washdown are key considerations, mechanical stainless-steel interlocks may be the preferred option. In other areas, such as packaging or palletising, electromechanical interlocks may provide the most appropriate solution.

Ultimately, interlock selection should be based on the specific application, risk profile, cleaning requirements, and operating environment, rather than a one-size-fits-all approach.

Need Help Choosing the Right Interlock?

Food processing environments rarely follow a one-size-fits-all approach. With nearly 50 years of expertise, Fortress Safety works with global manufacturers, OEMs, and integrators to help identify suitable interlocking solutions across the food and beverage sector.