Doppler current meter 4420/4420R/4830/4830R

タイトルまたは説明

The Doppler current meter 4420/4830 is a single point current meter that is mainly used for integration into the Andra Sea Defender platform for both scientific and commercial use. The 4830 measures temperature in addition to ocean currents. The 4420/4830 has both AiCaP and RS-232 outputs, with AiCaP when integrated into the Sea Guard platform and RS-232 output when used alone. The current meter is also available in two other models, 4420R/4830R, which can be connected to longer cables for use alone, RS-422 output, and cannot be integrated into the Sea Guard platform.

The Doppler current meter 4420/4830 uses the backscatter acoustic Doppler principle, which has two orthogonal sensor axes with two sensors on each axis, so that two-way measurements can be made on each axis, which is a big advantage of the sensor, which makes the sensor measurement insensitive to interference from eddy currents around the sensor (forward measurement is enabled). When the forward measurement function is enabled, only one sensor on each axis simultaneously sends acoustic pulses and receives acoustic pulse reflections from the particles, thus measuring the orthogonal velocity components of the X and Y axes and obtaining the horizontal velocity components after tilt compensation. Through the measurement of the X and Y axis velocity vector and the orientation of the built-in solid state electronic compass, the north and east velocity components are calculated, and the output flow rate and direction are obtained after multiple measurements.

The Doppler current meter 4420/4830 adopts ZPulse technology. The advantage of ZPulse technology is that it can improve the measurement accuracy. The complex acoustic pulse technology contains different frequencies in a single pulse, divides the received signal into different frequency bands, and each frequency band is transmitted to the processor as a pulse signal. The change of Doppler frequency is analyzed by using high-speed digital processor and ARMA parameter model algorithm. This multi-frequency technique reduces the number of pings while achieving the desired accuracy. The measurement accuracy of the instrument is inversely proportional to the number of pings, whereas the Zpuls technology uses two frequencies, and the number of pings is reduced to half that of a single frequency to achieve the same accuracy compared to a single frequency.

The Doppler current meter 4420/4830 is ideal for monitoring low-velocity water without moving particles, and because the measuring area is 0.4 to 1.0m away from the instrument, the impact of pollution and turbulence is minimal.

Features:
The unique ZPulse multi-frequency acoustic technology improves data quality, sampling speed, and reduces power consumption
Smart sensors are easily integrated on the Sea Guardian platform
Embedded solid 3D compass for tilt compensation
Read engineering data directly
Fast sampling speed
Low power consumption
Not sensitive to pollution
Low maintenance

Technical parameters: