| Cup type water current meter used for determining velocities of flowing water in open channels and streams has been manufactured to meet the requirements of I.S.3910.
The cup type water current meter consist of six cup assembly having six cups mounted on a vertical shaft. This shaft is held vertical in a yoke frame on two pivot points .
This yoke frame while holding the moving assembly protect its cups from damage from the Floating bodies in flowing water also. The vertical shaft rests on a pivot point at the lower end, which is adjustable. The upper end is held in position at a pivot point inside the magnetic contact Chamber, which is made water tight by a cap. The magnetic contact chamber is equipped with two contact switches the terminals of which are located out side on the body of the contact chamber. Only one switch is used at a time, the other is a spare and stand by switch and can be used immediately, if one goes out of order. The other end of the contact terminal (earth) is the yoke frame itself and so a common earth terminal has been provided on the yoke frame .
The bucket wheel rotates in between two pivots in the yoke frame. Each one revolution of the bucket wheel makes a contact of the magnetic switch in the magnetic chamber which can be recorded on a counter. The yoke frame consist of a tail fin with a balance weight, which moves in a slot and can be adjusted at any place within slot. The balancing weight is so adjusted so as to keep the current meter horizontal when suspended in water. The tail fin keeps the yoke frame with the bucket wheel to the upstream direction as the tail fin goes to downstream direction with the flow of water. The meter is suspended in water with the help of a suspension flat in deep water, and by a suspension wading rod in shallow water. |
