A safety-instrument is a mechanism designed to detect an unsafe condition or deviation from safe operating parameters and execute an action that brings the system into a safe state. Its parameters are: (1) sensing — the instrument monitors one or more process variables against predefined safe limits; (2) logic solver — the instrument compares sensed values to safe-setpoints and triggers a response when a breach is detected; (3) final element — the instrument actuates a physical change (valve closure, shutdown, alarm) that removes or mitigates the hazard. Its persistence mechanism is engineering documentation integrated into safety lifecycle standards (IEC 61508/61511, ISO 13849), regulatory inspection regimes, and the physical installation itself within the process plant or system. [formal: instrumentum salutis | substrate: matter | horizon: a life | explicit: yes | epoch: 0.53]
Accepted ontology entry
safety-instrument
A safety-instrument is a mechanism designed to detect an unsafe condition or deviation from safe operating parameters and execute an action that brings the system into a safe state. Its parameters are: (1) sensing — the instrument monitors…
Definition
Why it is in scope
A human-made mechanism that detects an unsafe condition or process deviation and takes automatic action to bring the system to a safe state. Built to persist through safety standards (IEC 61508, IEC 61511, ISO 13849), engineering documentation, regulatory compliance regimes, and physical installation in critical infrastructure.
Names and aliases
- safety-instrumenten · CANONICAL
Relations from this entry
- cms7wyk72004ph6s8d82lhwqlSERVES →
Safety instruments are designed and maintained for the sake of reliability: they automatically act to bring a process to a safe state when operational limits are exceeded, preventing failures that would undermine reliable operation.
- cms63ndki02vki9iqrg5ir2vnINSTANCE_OF →
A safety-instrument is a specific kind of instrument — an instrument designed to maintain or restore a safe state when process conditions exceed predetermined limits. A competent speaker would call it 'an instrument.' Files against nearest kind per Law 9.
Relations to this entry
No accepted relations in this direction.
Record identity
- Created
- Aug 7, 2026, 11:46 AM UTC
- Content hash
- 1cc830460e2b67e845f1e3c5861137a82e4913f68072b0bea3e9d33e3cc302b7