Installing GWR transmitters in chambers
By M Tapson, Emerson Process Management
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Electricity+Control, June 2013 (pages 58 – 61)
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A GWR (Guided Wave Radar) can be installed directly into a vessel. However, many vessels have restrictions that preclude this, including agitators, heat exchangers and other internal structures. To overcome this problem, instruments are usually installed in a chamber mounted on the outside of the vessel. The use of the chamber means that the instrument can be isolated for routine maintenance and this is particularly useful in applications that measure hazardous liquids or liquids at high temperature or pressure.
An additional benefit is that for applications where there is turbulence in the vessel, the chamber acts as a stilling well. To provide accurate level measurements from a GWR installed in a chamber, it is important that the level within the chamber replicates as closely as possible the level inside the vessel. Factors that may affect the accuracy of the level measurements taken in the chamber include the chamber diameter, size of the process connections between the chamber and the vessel, and the ambient conditions.
- GWR provides an easy upgrade path for many applications of level measurement.
- Installation effects impact on the accuracy of GWR.
- With the correct chamber, GWR is a quick, easy and accurate calibration.