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Falmouth Scientific ACM PLUS; Family of Current, Wave, & Tide Meters

Falmouth Scientific 3-Dimensional Acoustic Current Meter (ACM-PLUS) collects, outputs and stores instantaneous current velocity data in three dimensions along with 3-axis compass data, 2-axis tilt data, temperature data, and data from optional sensors, including an integrated CTD. The current velocity and tilt data can also be output and stored as vector averages over specified averaging intervals.

  • Falmouth Scientific ACM PLUS; Family of Current, Wave, & Tide Meters
Falmouth Scientific
33 Jonathan Bourne Dr / PO Box 315
02559 Pocasset
United States
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Description

Falmouth Scientific 3-Dimensional Acoustic Current Meter (ACM-PLUS) collects, outputs and stores instantaneous current velocity data in three dimensions along with 3-axis compass data, 2-axis tilt data, temperature data, and data from optional sensors, including an integrated CTD. The current velocity and tilt data can also be output and stored as vector averages over specified averaging intervals. The ACM-PLUS is configured and operated using ACMProPlus, a Microsoft Windows based software program included with the instrument. With ACMProPlus you can configure and deploy the instrument, acquire data in real time and download the data from the instrument’s memory. And the real-time data can be viewed on a real-time monitor or a dashboard.

The ACM-PLUS Instrument

The ACM-PLUS measures current velocity in the two horizontal dimensions and the vertical dimension using four acoustic transducers. Included inside the instrument’s housing is a 3-axis solid state compass for measuring the Earth’s magnetic field and a 2-axis solid state accelerometer for measuring tilt. A temperature sensor for measuring water temperature is located on the top end cap. Along with the optional CTD, the ACM-PLUS can optionally include two auxiliary analog input channels which interface with most DC output sensors, including dissolved oxygen, pH, chlorophyll, light transmission, and others. The ACM-PLUS can be powered from an external DC power supply or from an internal alkaline battery pack. Data can be acquired in real time in ASCII format through an RS-232 or RS-485 serial interface at baud rates up to 115200 bits/sec, or the instrument can be deployed and the data stored in its memory for later retrieval. A single bulkhead connector on the top end cap provides the RS-232 or RS-485 connection and inputs external power. The ACM-Plus is small in size and low in weight and has a depth rating of 200 meters. In addition, a 1.5-ton working strength 316 stainless steel frame is included with pad eyes on the top and bottom for securing to a mooring line, and zinc anodes are attached to the frame to provide cathodic protection. Optionally available is a 5-ton 316 stainless steel frame. In addition, a 7000-meter rated ACM-PLUS is optionally available.

Specifications

  • Area of Application
    The Falmouth Scientific, Inc. enhanced Acoustic Current Meter delivers extremely precise 2 or 3 dimensional velocity measurements (user selectable) in a defined free field.The ACM-PLUS is available in either shallow-water ordeep-water housings. The device may also be equippedwith an optional pressure sensor, an optional CTDmodule, and can be configured to log up to two analoginputs from external sensors (e.g., DO, OBS, etc.).
  • Field of Use
    The ACM-PLUS uses the most accurate and stable current measurement techniques available today and is configured with standard features that are options on competitive instrumentssuch as extended on-board data memory, fast download capability, high accuracy real-time clock, and high speed data sampling.
  • Year of latest version
    2012
  • Processor
    []
  • Operating System
    Wndows 7 or higher
  • Power supply (internal/external with specs)
    8-32VDC
  • Operating current
    15 mA at 1 Hz sample rate; 80 mA at 10 Hz sample rate; 150 uAmp sleep
  • Output interface {eg. rs232}
    RS-232 or RS-485
  • Housing material
    Epoxy or titanium
  • Width [cm]
    238
  • Length [cm]
    990
  • Operating temperature: min. [°C]
    -5
  • Operating temperature: max. [°C]
    40
  • Type of sensor
    Acoustic Current Meter
  • Range
    0 to 600 cm/s
  • Accuracy
    ≤ 1%±0. 5 cm/s
  • Resolution
    0.01 cm/s
  • Type of sensor
    Single Point
  • Range
    0-600 cm/s
  • Accuracy
    <=1% +/- 0.5 cm/s
  • Resolution
    0.01 cm/s
  • Minimum operating depth {m}
    1
  • Depth rating [m]
    7000
  • Output data format
    Serial ASCII
  • Sampling rate
    10 Hz Maximum
  • Data storage
    8GB standard
  • Additional capabilities
    up to two analog inputs from external sensors

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