This unit is not Obsolete. SEE DWYER EDA OR 628 SERIES FOR POSSIBLE REPLACEMENTS.
Series 634ES Transmitters sense a single pressure for air, compatible gas or liquid and provide 4-20 mA output signal. Positive pressure can be measured with an accuracy of ±0.5% of span. The Series 634ES uses an isolated piezoresistive pressure sensor to produce a resistance change across a Wheatstone bridge. Convenient 2-wire operation simplifies installation. Zero and span adjustments are fully protected inside a rugged die-cast aluminum housing with a durable gray polyurethane finish. The enclosure is designed to meet NEMA 4X requirements.
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