The S4 Current Meter family is a continuing evolution of a series of related products that are continuously upgraded using the latest devices and techniques in microprocessor based instrumentation.

The S4 families of instruments measure Current Speed, Direction, Wave, Tide, CTD, Turbidity, and Water Quality parameters.

The S4 Current Meter is a truly unique instrument for water current sensing. The instrument itself is the self-contained current measuring sensor, enclosing all necessary solid-state electronics for acquiring, processing and outputting data.

The S4 is designed to measure the true magnitude and direction of horizontal current motion in any water environment. The voltage is sensed by the two pairs of titanium electrodes located symmetrically on the equator of the sensor. The data obtained is then stored in non-volatile solid-state memory.

The simple spherical shape of the S4 is a contributing factor in the excellent rejection of vertical components of water movement, providing significant improvements in measuring currents in the wave zone. Also, because of its low threshold and low noise level, the S4 is the current meter of choice for low current regimes.

The unique grooved surface of the S4 housing produces stable hydrodynamic characteristics that ensure exceptional linearity and stability. This new hydrodynamic design, in which the instrument body itself is the source of current measurement, is a technological breakthrough. The S4 has withstood rigorous performance testing, and has produced excellent and stable data in the field.

The internal flux-gate compass provides heading information, which is used to reference the current direction to magnetic North. For fixed installations, the S4 may be operated in an X-Y orthogonal mode whereby the current vector can be referenced to the instrument housing.

Adaptive sampling, user programmability, optional sensors and expandable memory permit highly selective data collection and /or longer deployment intervals.