Monitored access devices
Machine Guard Interlock Switches
An interlock monitors whether a movable guard is in the intended position and initiates the defined safe response when access is requested or the guard is opened.
- Delivery
- Survey to handover
- Coverage
- Great Britain
- Application
- Project-specific
System intent
Designed around the task—not simply the available component.
An interlock monitors whether a movable guard is in the intended position and initiates the defined safe response when access is requested or the guard is opened.
We develop the guarding arrangement in the context of machine movement, product flow, operator behaviour, cleaning and foreseeable intervention. The scope is then defined clearly for detailed engineering and installation.
Key engineering decisions
What the design needs to resolve.
These points are reviewed together because a change to access, stopping or production flow can alter the required safeguarding approach.
- 01
Defeat resistance
Select and position the device to reduce simple bypass or manipulation.
- 02
Mechanical alignment
Allow for door movement, vibration, tolerances and foreseeable impact.
- 03
Fault detection
Define architecture and diagnostics so relevant faults are detected within the required safety function.
- 04
Access frequency
Match device, actuator and mounting to how often the guard is used and how it is handled.
Application review
Design considerations.
- Hinged, sliding or removable guard type
- Frequency and force of door operation
- Need for coded or uniquely coded actuation
- Series connection and diagnostic coverage
- Washdown, dust, vibration and temperature
- Escape release or emergency opening requirements
Typical project output
What can be included in the scope.
The precise deliverables are agreed before work proceeds and depend on whether the project covers mechanical guarding only or an integrated safety-system modification.
- Interlock selection and mounting design
- Door hardware and alignment features
- Safety-control wiring interface
- Status and diagnostic indication
- Functional testing
- Device and maintenance information
