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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.
| 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. |
 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. |
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| Current Speed | ||
| Range | 0-350 cm/sec (standard) 0-50, 0-100, 0-600, 0-750 cm/sec |
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| 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) |
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| 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 |
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| 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 |
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| 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 |
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| 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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S4 Current Meter Family
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S4 Current Meter Family
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