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Cause and Effect Drawing in process instrumentation Causes can include a change in the state of a digital input, a High High Low Low alarm from an analogue input, and interlock logic, among other things Effects can include tripping a motor or pump, closing a valve, opening a pressure relief valve, activating an emergency alarm, Beacon Hooter, and so on Detailed Explanation of Cause Effect Drawings Some projects categorize Cause and Effect
Check List: How to Troubleshoot a Thermocouple? - AutomationForum Record details of the interlock inhibition, including date, time, reason, and responsible personnel Tools and Equipment Required for Troubleshooting Thermocouple Digital multimeter Calibrated temperature simulator (process calibrator) Insulation resistance tester (megger) Thermocouple reference tables Standar tools Personal Protective
Valve Failure Modes | Basic Principles of Control Valves and Actuators . . . An important design parameter of a control valve is the position it will “fail” to if it loses motive power For electrically actuated valves, this is typically the last position the valve was in before loss of electric power For pneumatic and hydraulic actuated valves, the option exists of having a large spring provide a known “fail-safe” position (either open or closed) in the event
Troubleshooting Guide for On-Off Shutdown Valve Operation: Common . . . Troubleshooting on-off shutdown valves involves diagnosing and resolving issues affecting their feedback signal, movement, and responsiveness This comprehensive guide outlines step-by-step procedures and solutions for three common problems encountered in valve operation
Cascade Control | Basic Process Control Strategies and Control System . . . What is Cascade Control? Cascade control setpoints are sent to a secondary controller from a primary control system, each monitoring a different variable, with the secondary controller monitoring the data with the most time-sensitive response