Envirtech Subsea Systems S.r.l.

- Model MK-IV 3 Metres - Oceanographic Data Buoy

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The Envirtech MKIV, 3-Metres buoy, is state of the art in met-ocean data gathering. The buoy is composed of a multi-sector rotationally moulded, foam-filled floats, and stainless steel mechanical frame and turret. It can host many payloads. In standard configuration it includes a solid-state MEMS directional wave measurement pack, an automatic weather station (AWS)and a sea surface temperature transducer. Payloads can be expanded with further instrumentation to measure bio-chemical and physical parameters, like multi-parameter probes, ADCPs (both reversed assembling or on-seabed deployed), multi-satellite, multi-channel receiver for iSSH measurement (tide). The buoy dimensions, the focal light height and the radar corner reflector allow good visibility in any conditions, day or night. The buoy is the ideal solution for permanent floating laboratories.

Main features are:

  • AHRS Attitude Heading Reference System (Micro-Electro-Mechanical) containing a digital compass that can measure the directional waves parameters and spectra;
  • A very low power consumption CPU with high processing capability;
  • A VHF or UHF radio modem, 100mW to 5W in power;
  • An Iridium satellite transceiver containing a GPS receiver to be used as a back-up relay system and to track the buoy position and/or an Inmarsat mini-C;
  • Autonomous power supply system based on solar panels or a primary lithium battery pack.

All data provided by sensors (wave sensors, meteo sensors, multi-parameter probes, ADCP) are stored using a compact flash NVRAM with capacity up to 32 Gb. The MKI CPU includes three axial acceleration and the three axial gyros to obtain the wave directional spectra and to address the zero crossing analysis. The electronic unit is protected inside a waterproof cylinder equipped with waterproof connectors to interface the radio antenna, the meteo sensors, the satellite modem and the optional multiparameter probe (CTD + other sensors ) that can be fixed using one or more moonpools through the floats. The pole and the floats can be disassembled to facilitate the transport of the buoy: the pole can be split into two parts and the float can be divided into three segments.

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