The 4-20mA sensor bridge has four connectors that can be used to monitor up to four sensors with 4-20mA output. 

Most equipment with 4-20mA output will require an external DC power source to feed the 4-20mA loop. Please refer to the datasheet of your equipment to find the appropriate type of power supply to use. The 4-20mA bridge will then be part of the 4-20mA loop as depicted below.

Note: Connect the 4-20mA sensor bridge to an available port on the Node and power the Node before wiring the external sensor/equipment to the 4-20mA sensor bridge.

Click here for web configuration information for your 4-20mA sensor bridge. 

Power: 3.3V DC from node or gateway via micro-USB connector
Inputs: 4 x 4-20mA signals
Bridge Output: 4 x 4-20mA values (averaged over the sampling period)
Size (inches): 2.1 x 2.1 x 0.4
Weight (ounces): 0.8

Note: you may have a 4-20mA bridge that has four separate connectors as depicted on the image below.