4-20 mA Sensor Board (Current Loop) for Arduino, Raspberry Pi and Intel Galileo
4-20 mA current loop shield board: a robust standard
The 4-20 mA analogue current loop shield board is one of the most reliable standards on the market and allows you to transmit information to a 4-20 mA current loop receiver, even if it’s located more than 500 metres away.
The advantage of the 88145 4-20 mA shield board is that it uses the current, and not the voltage, to represent a physical quantity on a defined scale.
The signal sent by the 4-20 mA current loop transmitter is therefore never affected by the voltage drops that occur throughout the line as the current passes through the different components installed on it.
Uses of the 88145 4-20 mA Current Loop
Technically speaking, we use a current loop (usually 4-20 mA rather than 0-20 mA) to translate a given signal (barometric pressure, temperature, humidity, etc.) into electric power.
In this context, 4 mA represent level 0 in a given scale, and 20 mA its highest level. Physical quantities are hence transmitted as a scale percentage, e.g. a current of 12 mA would correspond to 50% of the given scale.
At the other end of the line, a 4-20 mA current loop receiver retranscribes this power as a voltage, which can then be processed by a computer or any other device and transmit the information to the user.
Technical specifications of the 4-20 mA Analogue Current Loop
- Type: analogue
- Media: twisted pair
- Number of channels: 4
- Distance: 900 m
- Supply: 5–24 V
- RoHS compliant
Resources for the 4-20 mA Sensor Board (Current Loop)
Check out this tutorial to get rapidly started with your 4-20 mA Sensor Board (Current Loop):