indu-tech has incorporated a Level Transmitter instrument side purge. After the valve is flushed clean with the primary purge port, the valve is closed. Metered air is applied to the Transmitter side of the Instrument. This allows for the full calibration of the Level Transmitter while in situ.
This eliminates the costly expense of emptying the tank, removing the Level Transmitter and taking it back to the instrumentation to be put on a test bench for re-calibration. An accurate and reliable system when you really need to know what your process is telling you.