The Series 4000 Flow Sensor has an in line, flow-through design using a tangential six bladed impeller. The Sensor is available in 1/2 in. (12.70 mm), 3/4 in. (19.05 mm) and 1 in. (25.40 mm) pipe sizes, and a wide range of pressure and temperature specifications.
The sensors have a molded housing, rotating impeller and externally mounted electronics housing using a proprietary, nonmagnetic sensing technology. The closed, six-bladed impeller design provides higher and more constant torque than four-bladed designs, and is less prone to fouling by water borne debris. The shape of the impeller and the absence of magnetic drag provides improved operation and repeatability even at low flow rates. The housing design allows the impeller, bearings, shaft or O-rings to be cleaned or replaced without removing the sensor from the piping system.
Two signal output options are available. One option is a square wave frequency proportional to flow rate. Power for the circuit is provided by an external source through a three-wire shielded cable. An internal preamplifier allows the signal to travel a maximum of 2000 ft (609 m) without amplification, and 20 ft (6 m) of three-conductor cable is included. The second output option is a 4…20 mA current analog signal. Power is provided by the two-wire loop so the distance from the receiver is a function of power supply voltage and wire resistance. A maximum 30 in. (762 mm) connector cable is included.
Sensors of similar type are interchangeable, so there is no need for recalibration after servicing or replacement.