Hydrological Services have adopted the U.S.G.S.Columbus Pattern gauging weights which range from7 to 135kg. These streamlined weights maintain a steadier position in water flowing at high velocities and align the current meter into the flow. They also offer less resistance to flowing water and have less effect upon the meter rating. They are longer than the current meter, thereby offering some protection from bridge piers and flowing debris. The hanger bar is attached to the weight and the Current Meter is mounted on the hanger bar.
This assembly is suspended from a gauging winch with an armoured signal cable. Hanger bars are used to suspend the gauging weights below the OSSBI Universal Current Meter and are available in two sizes. All weights are corrosion resistant and are bright yellow epoxy coated or can be supplied unpainted.

Special features:
- Streamlined shape offers less resistance to flowing water and has less effect upon meter rating
- Bright yellow epoxy coated weight or can be supplied unpainted
- Protects current meter against heavy debris damage

Available models:
CW7: weight = 7kg
CW15: weight = 15kg
CW23: weight = 23kg
CW34: weight = 34kg
CW45: weight = 45kg
CW68: weight = 68kg
CW90: weight = 90kg
CW135: weight = 135kg

Options:
Columbus weights from 23 to 135kgs can be supplied with ground feeler contact systems.