SiS Sensoren Instrumente Systeme GmbH

SMM 500, 2000 and 6000 X Subsurface Mooring Monitoring Beacons

SMM 500 and 2000 Photo

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. The features are:

Titanium housing
Up to ten years mooring life (limited by used batteries, up to 6 months in euphotic zone)
Up to 9 (SMM 500) or 18 (SMM 2000 and 6000) months transmission life
Powered by 5 D size batteries (5 or 10 with SMM 2000 and 6000)
High efficiency "True Energy" switch mode power supply

Water depth up to 500, 2000 or 6000 metres respectively
Trigger threshold 4 metres (SMM 500) or 30 metres (SMM 2000 and 6000)
Double O-ring seals
Antenna protected by acetal resin (POM) dome (SMM 500) or cage (SMM 2000 and 6000)
Triggered by pressure switch
ARGOS platform terminal transmitter

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. Benefits are:

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

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.

Specifications

	SMM 500 X	SMM 2000 X	SMM 6000 X
Mooring depth	500 m	2000 m	6000 m
Pressure switch threshold	3 - 5 m	25 - 35 m
Dimensions (l x d)	853 x 60.3 mm	742 x 89 mm
Mass without batteries	3.8 kg	6.7 kg
Displacement	2.4 dm³	3.1 dm³
Power supply	5 pcs. D size cells	5 or 10 pcs. D size cells resp.
Battery cell voltage	0.8 - 3.7 V
Peak supply current	100 mA
Average power consumption when surfaced	35 mW
Mooring life	up to 10 years
Mooring life in euphotic zone	up to 6 months	not applicable
Transmission life	up to 9 months	up to 18 months

Mooring and transmission life depend on the type (chemistry) and number (5 or 10 pcs.) of the used batteries.

Due to the internal antenna the SMM 500 X may be used in euphotic zones (up to 200 m).

Options

Stowage case for SMM 2000 and SMM 6000

Additional Information

SiS GmbH reserves the right to change specifications without prior notice.