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Comment PDF Processing & Handling

New Measurement Practices for Cold Climates

By Mark Menezes, Emerson |

Selecting the right pressure, temperature, flow and level meters and connection systems can help to eliminate the need for heated enclosures and sensing lines In an environment where the ambient temperature can fall below –20°C, outdoor measurements can suffer from poor accuracy, slow response, poor reliability and unreadable displays. To avoid these problems, users have traditionally specified heated enclosures and heat-traced sensing lines and capillaries, but these incur high capital and operating costs. A previous article [ 1 ] provided recommendations for improving steam-flow measurement by installing the transmitter on top of the flow element to eliminate the formation of wet legs, thereby reducing the cost and risk of wet-leg plugging and freezing. It also recommended conducting liquid level measurement by using remote sensors connected by wires, rather than wet legs or oil-filled capillaries. In recent years, additional practices have emerged that further leverage improving technology and experience, including the following Modern transmitters can be directly installed in the field, with no enclosures (heated or unheated) New seals allow pressure and level transmitters to be close-coupled, with connections heated by the…
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