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1986 Series, Bottom stem 1982 Series, Bottom stem Ametek Solfrunt Gauge 4−1/2" 0 − 200 psi 2 psi 1/2 NPT Bottom stem 1986 Series. K MONEL® Bourdon tube and socket. (PIC) Designed for pressure measurements as low as a few inches of water, these gauges, in spans from 30" H20 to 10 psi utilize a unique sensing element. It is composed of a stack of diaphragm capsules, each consisting of two plates contoured into a convex / concave configuration to nest into one another. This results in a low internal volume element developing large forces to drive the mechanism in extremely low pressure ranges.

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