Built to Stay Accurate: The Engineering Behind the RG3 Perpetual® PD Meter

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A displacement meter can only ever read correctly or read low — it's mechanically incapable of over-registering, so every bit of aging drift comes straight out of utility revenue. This paper traces that drift to its source: uneven bolted clamping that distorts the measuring chamber, nitrile seals that harden and crack in chloraminated water, and a standard outlet gasket that loses sealing force years before the meter is pulled. The Perpetual's boltless case, all-silicone seals, and oversized outlet gasket target each mechanism directly — backed by a 10-year accuracy warranty and 25-year main case warranty.

White Paper · 7 pages · 15 min read