Instrument Engineers and Instrument Technicians ought to read Instrument Level Sketches before replacing or installing the Level Transmitter. The reason is to reduce potential error reading and disturbing of the Level Control System when it is in use.
Instruments that will be used for Level Measurement need Nozzles on static equipment (e.g. Vessel, Storage Tank, Heat Exchanger) with dimension variety. Dimensions of nozzles have been designed by a Vessel Engineer in Mechanical Drawing. Instrument Level Sketches can represent Mechanical drawing. Another function is to be used for Installation references as well as elevation calculation for Instrumentation Levels, such as Level Gauge and Level Transmitter.
Nozzle distance values inside Instrument Level Sketches need calculation to get the proper Low Range Value (LRV), Upper Range Value (URV) and Span of the Level Transmitter.
In my early career, I had difficulty reading and calculating Low Range Value and Upper Range Value of Instrument Level Sketches. The experience has given me a lesson to learn more about Instrument Level Sketches.
Through this content, I want to share my experience about basic how to calculate Low Range Value and Upper Range Value of the Level Transmitter in Instrument Level Sketches.
On page 1, Instrument Level Sketch of Steam Condensate Drum 200-V-101 that has Single Level DP Transmitter using a condensate pot and It needs calculation LRV, URV and Span. The value will be set in the Level Transmitter as 4-20mA. The step-by-step method has determined to get the LRV, URV and Span of the Level Transmitter.
On page 2, as a trial, I have made a question.
Share the answer if you have got it.
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