From the course: Input Sensors with PLC: 4-20 mA Current Loop
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Optional: Calculating mA current reading
From the course: Input Sensors with PLC: 4-20 mA Current Loop
Optional: Calculating mA current reading
- [Instructor] This is an optional video that I want to show you an example of how to calculate the output value in milliamps based on specific input from the sensor range. The sensor range provides the input values, and the transmitter range provides the output values. I'll use the same example from the previous video. For this thermocouple, the sensor is designed to measure temperature between 0 to 300 degrees Celsius, and the output of the transmitter is designed to give values between 4 to 20 milliamps. The 0 degree Celsius and the 4 milliamps are considered the lower range values for the input and output ranges. The 300 degree Celsius and the 20 milliamps are considered the upper range values for the input and output ranges. Let's say that the sensor is measuring 150 degrees Celsius. I did mention that the output is expected to be around 12 milliamps, so I want to show you the calculation for it. The calculation is…
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Contents
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Introduction to the 4-20 mA loop2m 41s
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Industrial 4-20 mA current loop basics2m
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Industrial 4-20 mA current loop components3m 11s
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Industrial transmitters overview4m 22s
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Optional: Calculating mA current reading3m 51s
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Example: Wiring a temperature sensor to the PLC2m 55s
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Why start from 4 mA instead of 0 mA?1m 41s
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Why choose 4 mA instead of 10 mA?2m 12s
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Load resistor in a 4-20 mA current loop3m 36s
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