Trapped-key interlocking utilizes locks and keys for sequential control of equipment and machinery to ensure safe operation. Trapped-key interlocks are widely used to ensure safe access to potentially live or dangerous plant or equipment in an industrial setting. A safe sequence of operations is enabled through the transfer of keys that are either trapped or released in a predetermined order.
Trapped Key Interlocking System Products and Features
Trapped Key Interlocks (Skorpion Range) - Die-Cast and Stainless-Steel
- Mirror polished die-cast metal or 316 grade stainless steel
- Robust with high mechanical integrity
- Comprehensive range
- Thousands of mechanical key codes
- Stainless steel is suitable for IP69K requirements
- Stainless steel is suitable for SIP/CIP cleaning
Mini Valve Interlocks - Die-Cast and Stainless Steel
- Option when key free of passing or non-passing (open or closed valve).
- Five thread sizes (BSP) to cover the most popular options.
- Compact design for ease of mounting.
- Stainless Steel is suitable for CIP and SIP cleaning processes and can be high-pressure hosed with detergents at high temperatures.
What to Consider when Designing a Trapped Key System:
Stage 1 Isolation: The first stage of any trapped key system is to isolate the power or control circuit. This should STOP any hazardous processes.
Stage 2 Key Exchange: The second stage is exchange. The isolator key can be used to open 1 access lock at a time or, if there are multiple access locks, a key exchange can be used.
Stage 3 Access Control: Access locks prevent entry to hazardous areas. Only when the correct coded key is presented, will entry be permitted.
Stage 4 Personnel Key: The personnel key is predominately used in full body access situations, allowing the user to operate safely inside the hazardous area.
IDEM Safety Product Overview Catalog
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Trapped-key interlocking uses locks and keys for sequential control of equipment and machinery to ensure safe operation.