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Three-valve Manifold on Remote Seal DP Transmitter

Explain why no one in their right mind would ever, ever, install a three-valve manifold on a DP transmitter with remote seals:

Remote Seal DP Transmitter

Three-valve Manifold on Remote Seal DP Transmitter

Answer:

If the equalizing valve is ever opened, it could shuttle fill fluid from one remote seal to the other, imbalancing the system.

This would make the transmitter read less differential pressure than there actually was applied between the remote seals.

The problem would be difficult to correct without dismantling the system entirely and re-packing the seals and capillary tubes with fill fluid.

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Credits: Tony R. Kuphaldt

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Three-valve Manifold on Remote Seal DP Transmitter

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