Vertical axis current meter

The first current meter was designed by R. The device spread quickly and was widely used and improved. Geological Survey (USGS) is field and laboratory testing the performance of several current meters used throughout the world for stream gaging. Subject: Care and Maintenance of Vertical - Axis Current Meters.

Because of the bearing system, the vertical-shaft meters will operate at lower velocities than horizontal - axis current meters.

A choice of rods and computer console.

The meters used in the study are known as small Price meters.

They depend for their operation on the differ- ential pressure acting on the open and closed ends of the cups. Rotor is less likely to be entangled by debris than are vertical- axis rotors. Bearing friction is less than for vertical-axis rotors because bending moments on the rotor are eliminated. A common type of vertical - axis current meter is the Price meter,. The stainless steel spindle carrying the cup wheel freely rotates in the bearing assembly.

The magnet and reed switch assembly produces one pulse per rotation. The rotation of the Water Current Meter is sensed by . Hence the Velocity of Flowing Water is obtained by counting the ringing of the Bell, the Rotation at Wheel. Hence the Current Meter is free to move about its Horizontal and Vertical Axis. So that it can adjust itself to . The most common current meter used by the USGS is the Price AA current meter (fig. 4).

An electronic signal is transmitted by the meter on each . The main features of this meter are the uniquely designed bucket wheel shaft bearings and the two post contact chamber. The tungsten carbide bearings for the bucket wheel shaft are located in . The current meters of interest to the USGS are the vertical axis mechanical . Subclasses of Anemometer-Propeller Current Meters. These commonly used current meters convert velocity into counts of rotations.

Conventional meters are of two general typesCthe propeller type with horizontal axis of rotation and the conical cup type with vertical axis. MAVS current meter and three axes of angular velocity and three axes of linear acceleration were added to each data record of time, velocity, temperature, three-axis magnetic vector components and two axes of tilt. From the rate gyro value of angular velocity around the vertical axis , the platform . For high velocity measurement use lower nut connection. A listing of current - meter testing found in the literature was compiled and is grouped according to the type of meter tested and the type of test con- ducted.

Meter types included in the review were vertical- and horizontal - axis mechanical current meters and electromagnetic and acoustic . Current meters are classified according to their rotors. Vertical - axis rotors, which have cups or vanes, operate in lower velocities than horizontal axis meters. Their bearings are also protected from silty water. The rotor is also repairable in the field without impacting the rating, and the single rotor serves for the entire range of .