Intrinsic safety and hazardous areas
Цель: Изучить тему «Intrinsic safety and hazardous areas» и закрепить её практическими заданиями и самопроверкой.
2 акад. часа чтение и разбор теории, решение задач, работа со схемой или виртуальным стендом и проверка понимания.
Основной материал
Intrinsic safety limits electrical energy so sparks/thermal effects cannot ignite specified explosive atmosphere under defined fault conditions. System includes field device, cable parameters and associated apparatus/barrier.
Barrier
Zener or galvanic isolating barrier limits voltage/current/energy. Correct IS loop requires entity parameter comparison, grounding where required and approved equipment.
Zones/classes
ATEX/IECEx use zone and equipment protection concepts. Course only introduces terminology; actual selection requires current standards and certified documentation.
Практическая работа
Draw conceptual intrinsically safe loop transmitter -> IS barrier -> control system. List documents needed before real installation: certificates, entity parameters, cable C/L, zone classification, wiring drawing.
Самопроверка
• What is intrinsic safety?
• What does barrier do?
• Is an IS transmitter alone enough?
• Why cable parameters matter?
• Where find approved conditions?
Что нужно запомнить
- Intrinsic safety limits electrical energy so sparks/thermal effects cannot ignite specified explosive atmosphere under defined fault conditions.
- System includes field device, cable parameters and associated apparatus/barrier.
- Zener or galvanic isolating barrier limits voltage/current/energy.
- Correct IS loop requires entity parameter comparison, grounding where required and approved equipment.
- Course only introduces terminology; actual selection requires current standards and certified documentation.