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S4 Current Meter Family

Product code : 1489648128

The S4A Instrument family is a continuing evolution in a series of proven multi-purpose hydrographic data acquisition products that are continuously upgraded using the latest devices and techniques in microprocessor based instrumentation.

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  • Nhà Sản Xuât
  • InterOcean systems, inc.

    The versatile S4A instrument configurations are designed to provide direct measurements of Current Speed and Direction, Directional Wave, Tide, CTD, Salinity, Density, Sound Velocity, Turbidity, Chlorophyll and other parameters with high precision.
    The S4A is a truly unique instrument for water current sensing, designed to directly measure the true magnitude and direction current motion in any water environment using two pairs of titanium electrodes located symmetrically on the equator of the sensor.
    An internal flux-gate compass provides heading information, used to reference current direction to magnetic North or, for fixed installations, the instrument may be operated in an X-Y orthogonal mode whereby the current vector can be referenced to a landform or structure.
    S4|||s used in San Francisco Bay
    A shallow water mooring device used in San Francisco Bay
    The simple spherical shape of the S4A provides significant improvements for measurements in the wave zone or other turbulent high-energy environments and, combined with the extensive use of titanium and composite materials, are major contributing factors in its robust design, ease of handling, and unparalleled service life, offering decades of reliable user-friendly operation with minimal maintenance requirements.  At the same time, because of its low threshold and low noise level, the S4A is also the instrument of choice for low current regimes.  The unique grooved surface of the S4A housing produces stable hydrodynamic characteristics that ensure exceptional linearity and stability in all environments. The S4A in all of its various configurations have withstood rigorous performance testing, and has consistently produced excellent and stable data in the field.

    Adaptive multi-mode sampling, versatile user-friendly programmability, optional sensors, expandable memory and power options, and convenient interface with remote telemetry components, permit highly flexible and expansive data collection for any coastal or offshore application.
    Current Speed
    Range 0-350 cm/sec (standard)
    0-50, 0-100, 0-600, 0-750 cm/sec
    Accuracy: 2% of reading +/- 1 cm/sec
    Sampling Rate: S4/S4A
    S4AH
    2 Hz
    5 Hz
    Resolution: 2 Hz 0.03 to 0.35 cm/sec depending on range
      5 Hz 0.037 to 0.43 cm/sec depending on range
    Noise: Less than the resolution for averages of 1 minute or longer
    0.05 cm/sec rms for 10 second averages
    0.25 cm/sec rms for 2 second averages
    0.75 cm/sec rms for burst sampling (0.5 second rate)
    Threshold: Equal to resolution
    Vertical Response: True cosine response (internally software corrected with Tilt option)

     

    Direction
    Type: Flux-gate compass
    Range: 0-360
    Resolution: 0.5 deg
    Accuracy: +/- 2 deg within tilt angles of 5 deg
    Tilt: +/- 4 deg for tilt angles between 15 and 25 deg

     

    Memory
    Type: S4 CMOS static RAM (Non-restricted Lithium battery protected)
      S4A Non-volatile flash memory
    Battery Life: S4 5 years
      S4A No battery required
    Capacity: S4 64K bytes standard (128K, 256K, 512K, or 1M optional)
    348,000 vector averages may be stored with 1M bytes
      S4A 5, 10, and 20 megabytes
    7 million vector averages stored with 20 megabytes

     

    Timekeeping
    Type: Temperature stable quartz oscillator
    Accuracy: +/- 12 minutes/year
    Power: Temperature stable non-restricted Lithium battery (3 years)

     

    Power Supply
    Type: Internal batteries (6 Alkaline "D" cells), (Lithium optional)
    Endurance: Alkaline cells: 440 hours continuous logging. One year deployment with total on-time less than 440 hours.
      Lithium option: 1,600 hours continuous logging. Five years deployment with total on-time less than 1,200 hours.

     

    Tilt Option
    Angle Range: +/- 45 deg
    Resolution: 0.06 deg
    Accuracy: (Angle Output) +/- 0.25 deg
    (Speed Correction) +/- 1% of reading at 45 deg tilt

     

    Mechanical
    Size: S4 25 cm (10 in) diameter
      S4 Deep 35.5 cm (14 in) diameter
    Weight: S4 Air: 11 kg (24 lb.), Water: 1.5 kg (4 lb.)
      S4 Deep Air: 34.5 kg (76 lb.), Water: 10.5 kg (23 lb.)
    Mooring: In-line
    Through Load: 4,500 kg (10,000 lb.) working
    Pad Eyes: Insulating liner, accepts 1.6 cm (5/8 in.) shackle pin
    Material: Sphere, glass-filled cycloaliphatic epoxy.
    Mooring rod, Titanium 6 AL-4V
    Drag: S4 4 kg (9 lb.) at 250 cm/sec (8 ft/sec)
      S4 Deep 0.63 kg (1.4 lb.) at 50 cm/sec
    15.68 kg (34.57 lb.) at 250 cm/sec
    Depth: S4 1,000 m (3,200 ft) maximum
      S4 Deep 6,000 m (19,200 ft) maximum
    Temperature: Storage: -40 to +50 deg C
    Operating: -5 to +45 deg C
     

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