The Industrial Pressure, Flow, and Level Add-On - HART is an add-on to the Pressure, Flow, and Level Process Control Training System that comprises an ultrasonic level transmitter, a pitot tube, and a HART differential-pressure transmitter installed on an instrumentation pipe. The level transmitter allows students to continuously monitor the level in the column while the pitot tube and the differential-pressure transmitter measure the flow rate with accuracy. A pneumatic control valve completes this add-on and allows students to exert control over different processes. The two transmitters use a 4-20 mA signal as their output. This allows the use of either a programmable logic controller or a PID controller on the training system.