The MAVS Current Meter is a true 3 axis Acoustic Current Meter which employs a differential travel time measurement technique. The Current Meter takes measurements across 4 acoustic axes to provide a true vector averaged velocity measurement. Programmable burst mode and triggered sampling provide the most flexible current meter available.

The combination of small sensor geometry and differential travel time technique provide unsurpassed resolution and accuracy. The small transducer size significantly reduces the disturbance to water flow. While the standard range of measurement is 200 cm/sec, low speed measurement accuracy in the 0.03 cm/sec to 10 cm/sec range is preserved

MAVS-3 includes MAVSOFT Win95, Win98, WinNT user interface. Standard, commercially available software such as Hyperterminal or Crosscut may be used to communicate with MAVS-3 for getting real time data or for downloading and archiving recorded data to a PC. Software such as Matlab, Excel, Quattro Pro and Lotus 123 may be used for tabular display and graphing data.

                       Faired Acoustic Sensor

     The Mavs-3 employs a faired sensor head design with

     central strut and a 9.5 cm acoustic path length. The

     controller is an Onset Tattletale 8 which is

     mounted by a connector beneath the main circuit board.

     A battery pack comprising 18 AA alkaline cells provides

     all the necessary power to the instrument. A 4 pin

     connector mounted on the top end cap permits external

     power to be applied and provides TTL level, RS-232 or RS- 485

    communication capability.

Parameter         Accuracy              Resolution         Range

Speed                 0.3 cm/sec             0.03 cm/sec         200 cm/sec optional ranges available)

Direction             ± 2 deg                 1 deg                    360 deg

Temperature       0.1 deg C             0.03 deg C             -5 to 45 deg C

Conductivity     0.2 mS/cm             0.02 mS/cm            0 to 75 mS/cm

Pressure             0.5% F.S.              0.024% F.S.           15, 30, 60, 450, 3,000, 7,500 & 10,000 PSI

                            0.04% optional

                            0.08% optional

Tilt                      2 deg                     0.1 deg                   20 deg, 45 degree optional

Drift: 0.15 cm/sec per month

Measurement Technique: Differential travel time 3 axis

Acoustic Paths: 4 measured, 4 used

Internal Recording: 13.5VDC, 18 AA Alkaline batteries@ 4.8Ah, optional lithium thionyl chloride 14.4 VDC @ 8.8Ah

Direct Reading:    External 12-15 VDC

Current Drain:     23 ma. Measuring

                                 0.6 ma. Sleep Mode

Internal Recording Memory: 16,32,48,64, 96,128,160,192,256,300,512 Mbyte compact flash card

Memory Usage: Dependent on sampling method, and size of memory installed

Communications: TTL, RS-232 or RS-485 @ 38,400 baud maximum 115.2K baud

Depth: 2,000 m. or 6,000 m.

Dimensions:     Cylinder Diameter: 3.25 in.

                            Overall Length: 25 in.
 

Weight:     Water: 2.6 lbs.

                    Air: 5 lbs.

Mooring Frame: 2000 lbs. Optional 10,000 lbs available

Sampling Rates:     10 Hz in Earth Coordinates (resolved to Ve, Vn, Vup) or

                                   15 Hz in instrument coordinates

                                   25 Hz Raw Data, No Compass, No Options

Sea Cable: RS-485 or RS-232 4 wire (inquire for other communication protocols)

Data Record Size:     Standard Instrument: 32 bytes per record for Day, Hour, Min, Sec, T,Tilt,Ve,Vn,Vu

                                      Recorded as Binary and transmitted as ASCII Comma separated variables with CR LF
 

Operating Modes:     Vector Averaging

                                      Burst Mode (programmed for timed sampling)

                                      Externally Triggered Sample

                                      Continuous Sampling
 

Software:     MAVSOFT Windows95, Windows98, Windows XP/NT user interface

                      Terminal Emulator: Hyperterminal, Crosscut or Tattleterm

                      Optional Graphical Software available upon request
 

        Miami, Florida 33169                               Tel: (305) 621-2882

                                                                            Fax: (305) 621-1710