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