RCM Blue
2Pages

RCM Blue A rugged self-recording current meter with Bluetooth for communications and data retrieval. The instrument uses a true vector-averaging sensor for measuring current speed and direction in salt or fresh water, and a battery container with battery capacity up to 70Ah. Features • Internal data storage • Configuration and data retrieval by use of Bluetooth • Battery compartments with up to 70Ah • External LED with color code reports status • Software for configuration and retrieval of data and USB to Bluetooth adapter included • Unique ZPulse multi-frequency acoustic technology improves data quality, sampling speed and reduces power consumption • Built-in solid state three axis compass and tilt sensor with compensating algorithm • Temperature measurement • Optional pressure sensor • Direct readout of engineering data • Fast sampling rate • Low power consumption • Insensitive to fouling • Low maintenance needs The RCM Blue is a self-recording Current Meter which also measures water temperature as standard and pressure as optional. The Doppler Current Sensor is an upgraded version of the proven SeaGuard ZPulse sensor. The instrument configuration and data retrieval is done via Bluetooth which eliminates the need to open the pressure case for repeated deployments. The DCS sensors are based on the backscatter acoustic Doppler principle. The DCS has two transducers on each orthogonal axis. This enables the DCS to measure in both directions on each axis which makes it insensitive to disturbance from vortex speeds around the sensor itself and the mooring line when the forward ping feature is enabled. One transducer on each axis transmits short ultrasonic pulses simultaneously (50 to 600 pings in each recording interval). The same transducers receive backscattered signals from particles in the water. This gives an orthogonal x and y speed component which is tilt compensated to find the correct horizontal speed components. The North and East speed components are calculated based on the x and y speed components and the heading from the built-in solid state electronic compass. The sensor takes several of these two-component measurements and finally calculates the averaged north and east speed components and the vector averaged absolute speed and direction. Another great advantage is the ZPulse technology which improves the statistical precision. Complex acoustic pulses comprising two distinct frequencies which are combined into a single acoustic pulse. The ZPulse based DCS separates the received signal into different frequency bands, one for each frequency in the transmitted signal. Further it analyses the frequency shift using a high speed Digital Signal Processor using an ARMA (Auto Regressive Moving Average) based parametric model processing algorithm to find the Doppler shift frequencies. This multi-frequency technique reduces the required number of pings needed in order to achieve an acceptable statistical error. The achieved measurement precision is proportional to the inverse of the square root of the number of ping measurements in a measurement interval. The ZPulse DCS uses two frequencies and this gives a reduction by a factor square root of two compared to a single frequency sensor. A single frequency sensor needs twice the number of ping to achieve the same precision as the Zpulse DCS. The instrument outputs Absolute Current Speed and Direction, Speed in east and north direction, Ping Count, and extensive readout of quality control parameters such as Single-ping Standard deviation, Heading, Tilt in X- and Y-direction, and Signal St

Specifications Recording System: Internal data storage Storage Capacity: Standard 1GB Battery: 2 batteries compartments inside case Alkaline 3988: 9V, 15Ah (nominal 12.5Ah; 20W down to 6V at 4°C) or Lithium 3908: 7V, 35Ah Recording Interval: 2s - 2h Depth Capacity: 300m Material and Finish: PUR, POM, PET, epoxy coated titanium Platform Dimensions: H: 356mm OD: 139mm Weight: In Air In Water 7.0kg 1.7kg Supply Voltage: 6– 30Volts Operating Temperature: -5 to +50°C Current Speed: (Vector averaged) Range: 0 – 300cm/s Resolution: 0.1mm/s Mean Accuracy: ±0.15cm/s Relative: ± 1% of reading...