4-20 mA Current Loops

Components of a 4-20 mA Current Loop 1. Sensor First, there needs to be some sort of sensor which measures a process variable. A sensor typically measures temperature, humidity, flow, level or pressure. The technology that goes into the sensor will vary drastically depending on what exactly it is intended to measure, but this is …

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Simulation Circuit for Alarm Relay (in case of FIRE)

Basic Components: Main Fire Alarm Control Panel (MFACP) Sub Fire Alarm Control Panel (SFACP) Alarm Relay (Inside the SFACP) 2 Pole Relay Detector (Smoke, Heat, Multi-sensor Detector) AC Powered Horn – for Alarm Notification AC Power Supply directly connected to the nearest Panel Boards (with Separate Circuit breaker) In case of Fire (means a Detector …

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