Greyline Instruments DFS 5.1, User Manual

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DFS 5.1 Doppler Flow Switch
INTRODUCTION
DOPPLER FLOW SWITCH - Model DFS 5.1
The Greyline Doppler flow switch consists of an encapsulated ceramic transducer, a transmitter/receiver
unit, electronic circuitry to separate the Doppler frequency from the transmitted frequency and an
adjustable set-point relay. The relay also has hysterisis and delay-off capability.
The DFS 5.1 Flow Switch is housed in a watertight NEMA4X fiberglass enclosure and requires a
115VAC power supply.
Flow measurement range is 0.25 to 10 ft/second (0.076 to 3 m/sec).