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SiS SMM 500 Subsurface Mooring Monitoring Beacon


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Remotely monitor underwater moorings

Metocean     |     SMM 500

Sub-surface Mooring Monitoring remotely monitors underwater moorings that may accidentally rise to the surface. If the mooring breaks, the platform floats to the surface and starts transmitting.

Argos System CLS Service Argos has developed a special service for monitoring the status of the moorings. Normally a submerged Platform Transmitter Terminal (PTT) remains silent and undetected by the Argos satellites.

Should the mooring break loose however, and the PTT rise to within a few metres of the surface, it will begin to transmit. An alarm state is set upon reception of the signal by an orbiting satellite and recognition and processing at a ground centre. A warning that the mooring line has surfaced, with its position, will be sent to the user by facsimile. Thereafter each satellite pass will result in another location. This will continue until cancelled by the user.

High Efficiency True Energy Switch Mode Power Supply All SMM X series instruments contain an internal switch mode power supply to allow usage of a wide range of battery types. Up to 80% of the batteries initial capacity is used for operation, regardless of cell voltage and current source capabilities.

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  • Supports all kind of batterie types: NiMH, Alkaline, and Lithium
  • Wide battery cell voltage range from 0.8 to 3.7 V
  • Increased transmission times and usage of low current lithium thionylchloride batteries by reduced battery peak current by power buffering
  • Increased transmission times with lithium batteries by voltage converter
  • Increased transmission times by working down to 0.8 V cell voltage of discharged batteries
  • Titanium housing
  • Up to ten years mooring life (limited by used batteries, up to 6 months in euphotic zone)
  • Up to 9 months transmission life
  • Powered by 5 D size batteries
  • High efficiency True Energy switch mode power supply
  • Water depth up to 500 metres
  • Trigger threshold 4
  • Double O-ring seals
  • Antenna protected by acetal resin (POM) dome
  • Triggered by pressure switch
  • ARGOS platform terminal transmitter