Monitoring tank and liquid levels is a fundamental task in automation.
In this lesson, learn how to wire a level sensor. We will explain how a level sensor using a 4-20 mA signal can give you the data you need, and how you can get additional data from a sensor that communicates using the HART® (highway addressable remote transducer) protocol, even though the sensor has only two wires.
See Automation 101: Wire a Level Sensor (webpage) for a parts list, technical documents, wiring diagrams and more information.
Go to Opto 22 for more information on the SNAP-PAC Learning Center, PAC Control and other Opto 22 parts shown in the lesson.
Overview page of the transducer
Detailed specifications of the transducer
Opto 22 Case study: 2146, Plummer's Environmental Services
Learn about the HART protocol
Opto 22 SNAP I/O modules for use with the HART protocol data sheet