The Dry Leg in instrumentation is used to protect process instruments by containing what?

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Multiple Choice

The Dry Leg in instrumentation is used to protect process instruments by containing what?

The idea behind a Dry Leg is to keep the impulse line dry and free from condensate by using a short section that is filled with a non-condensing gas. Impulse lines carry the process pressure to a transmitter, and if moisture or steam condenses inside, it can lead to measurement errors, freezing, or blockages. Filling that leg with a gas that remains a gas over the operating range (often nitrogen) creates a barrier that prevents liquid water from reaching the instrument. This non-condensing gas stays dry even as temperatures vary, preserving accurate readings and protecting the transmitter.

The idea behind a Dry Leg is to keep the impulse line dry and free from condensate by using a short section that is filled with a non-condensing gas. Impulse lines carry the process pressure to a transmitter, and if moisture or steam condenses inside, it can lead to measurement errors, freezing, or blockages. Filling that leg with a gas that remains a gas over the operating range (often nitrogen) creates a barrier that prevents liquid water from reaching the instrument. This non-condensing gas stays dry even as temperatures vary, preserving accurate readings and protecting the transmitter.

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