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FISHER™ 634

Technical Specifications Parameter Specification Input Hydrostatic head pressure Output 3-15 psig (0.2-1.0 bar) Air Supply 20 psig (1.4 bar) clean, dry air Accuracy ±0.5% of span Span Ranges 25 inH₂O to several hundred inH₂O Process Connections 2" NPT, 3" NPT, ANSI flanges Wetted Parts Stainless steel, Monel, Hastelloy C Case Material Aluminum/epoxy coated cast iron Typical Applications Oil & gas production vessels Chemical processing equipment Power generation systems Water and wastewater treatment Pulp and paper industry

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The Fisher Type 634 is a pneumatic force-balance level transmitter designed for reliable liquid level measurement in various industrial applications. It converts hydrostatic head pressure from liquid level into a proportional 3-15 psig (0.2-1.0 bar) pneumatic output signal, making it suitable for pneumatic control systems and hazardous areas where electronic instruments are not preferred.