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Why is nitrogen added to the pressure transmitter placed at the bottom of the tank?

2016-02-01View Original

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Why is nitrogen added to the pressure transmitter placed at the bottom of the tank, and what is its purpose?
Reply #22016-02-01
Backblast? Prevent blockage of the pressure tap.
Reply #32016-02-02
Backflushing: the tube is inserted to the bottom of the tank; 0% liquid level corresponds to the bottom of the tank. @jiaguoyun

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