Oceanographic data collection and subsea data relay
We started to manage data buoys since our fundation . Our first project was the Italian Data Buoys Network, involving 15 buoys in the middle of the Mediterranean Sea.
At present we manage directly more than 25 data buoys and have sold more than 50 buoys worldwide. Basically Envirtech data buoys can be divided in two main groups. The first group contains Oceanographic Buoys
Envirtech MKI-3 hosts a solid state MEMS directional wave measurment pack, and a meteorological station. The payload can be expanded hosting further underwater instrumentation for the measurement of chemical and physical sea parameters. The buoy is composed of a central metal pole in AISI 316 Stainless steel and a rotationally moulded, medium density, UV stabilized, buoyant having the shape of a truncated cone. The buoy dimensions, the focal light height and the radar corner reflector allow good visibility in day and night conditions (3 nm).
Leading features are:
► Inertial sensor (Micro-Electro-Mechanical Systems) embedding a micro digital compass able to measure the directional waves parameters and spectra;
► A very low power consumption CPU with high processing capability;
► A VHF or UHF radio modem with power from 100mW to 10W;
► An Inmarsat D+ satellite transceiver embedding a GPS receiver to be used as back up relay system and to treck the buoy position; as option Inmarsat mini-C or Iridium for data telemetry too.
► Autonomous power supply system based on Solar Panels and rechargeable Gel batteries. An optional indipendent Lithium Battery pack.
All data provided by sensors (wave sensors, meteo sensors, multi-parametric probes) are stored using a compact flash NVRAM with capacity up to 32 Gb. The MKI-3 CPU integrates three axial acceleration and the three axial gyro, to get the wave directional spectra, together the zero crossing analysis. The electronic unit is protected inside a water proof cylinder equipped with underwater proof connectors to interface the radio antenna, the meteo sensors, the satellite modem and optional multiparametric probe (CTD + other sensors ) that can be fixed on the low part of the pole. The pole and the buoyant can be disassembled to facilitate the transport of the buoy: in particular the pole can be splitted in three parts and the buoyant can be divided in three segments.
Deep Sea MKI-3
1800 mm x 5800 (pole + buoyant)
Central metal pole in AISI 316 Stainless steel and rotationally moulded, medium density, UV stabilized, foam filled buoyant having the shape of a truncated cone composed of 3 parts.
AISI316 - Stainless Steel
Weight in water
-4°C +55°C (standard)
Extended Operational Temperature
-20°C +70°C (optional)
Yellow programmable 3 nm range
Focal Plane 2.8 m above sea level
Micromachined Electro-Mechanical System (MEMS)
Wave height -25 .. +25 m / Accuracy 5 mm / Resolution 1 mm
Wave Period 1.5 .. 35 s / Accuracy 0.1 s
Wave direction 0.360° / Accuracy 0.1 ° / Resolution 0.05 °
Range 0-60 m/s wind speed
Range 0-359° wind direction range
Range 600-1100 hPa
Accuracy +/- 0.5 hPa at 0..30 °C
ARM Processor 16 bit
Ram 1024 Kb
Very low power consumption
VHF/UHF RF Power 0.1 to 5 Watt
NVRAM - 32 GB
Solar Panels 260W
Gel Batteries 320W
Option: Lithium Power Pack
able to collect physical and chemical parameters, like sea waves data and energy spectra, quality parameters as dissolved oxigen, pH, turbidity, salinity and others.
The buoys are MKI-3 coastal buoy and the MKIV 3Metres.
The second group contains all buoys deployed to relay data acquired by underwater and seabottom devices like the "easy to deploy" MKI-4 Tsunami Buoy..