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Water Velocity Meter for Streams Flow River Dams harbors

DESCRIPTION

The Streamflo series of instruments are used to measure, indicate and record very low velocities of water and other conductive fluids. Designed primarily for laboratory and specialized industrial use, the miniature head of the flow
sensing probe can be inserted into small ducts and channels where it has the ability to measure velocities as low as 5.0 cm/sec. It is thus suitable for measuring accurately the velocities in hydraulic models of river estuaries, dams, harbors, etc., in addition to field measurements of clean water flows.

The new 440 indicator is supplied, as standard, with a set of rechargeable batteries. It can also be mains powered via the supplied universal charger.
The use of two probes allows the range of detectable velocities to be extended up to 300 cm/sec. All components have been chosen carefully to give a long reliable life with minimal changes in calibration within the
operating ranges stated under Technical Data. The sensing probe was originally designed by the British Department of Scientific and Industrial Research. Further development by Nixon Flow meters has resulted in a compact system offering digital indication with optional recording facilities.

Operating Principle

The sensor probe has a small impeller at one end, and a BNC connector at the other, joined via a slim, stainless steel tube.

The measuring head comprises of a 5 bladed PVC rotor mounted on a hardened, stainless steel spindle terminated into burnished conical pivots, resulting in minimal frictional resistance. This is all assembled and enclosed in a brass shrouded frame. An insulated gold wire contained within the
tube terminates 0.1 mm from the rotor blade tips. When the rotor is revolved by the movement of a conductive liquid, the passage of the rotor blades past the gold wire tip slightly varies the measurable impedance between the tip and the tube. This variation is used to modulate a 15 kHz carrier signal, generated within the indicating instrument which in turn is applied to the electronic detector circuits. All components have been chosen carefully to give a long reliable life with minimal changes in calibration.

Automatic compensation is made for changes in liquid conductivity. Following amplification and filtering out of the carrier frequency, a square wave signal is obtained. In the digital indicator the pulses are counted over a known time
period to obtain a digital reading.

Probes

403: Standard low speed velocity probe for the range 5.0 to 150 cm/sec

404: Standard high speed velocity probe for the range 60 to 300 cm/sec

423 :90 Degree angled probe to measure vertical velocities over the range 5.0 to 150 cm/sec

Technical Data
Velocity Range : 5 to 150 & 60 to 300 cm/sec using two sensing probes
Accuracy : ± 1.5% of true velocity
Scaling : Digital indicators scaled in HZ or cm/sec
Conversion to cm/sec by means of individual calibration curves
Operating temp: 0 to 50°C
Operating Medium : Water or other fluid having similar conductive properties

(MADE IN ENGLAND)