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MD76 HEADING MON (OFF COURSE ALARM)

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MD76 HEADING MON (OFF COURSE ALARM)



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MD76 HEADING MON (OFF COURSE ALARM)










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NMEA Digital Input
• An alarm sounds if the vessel heading deviates by more than a pre-set amount.
• An important aid for maritime safety.
• Accepts NMEA 0183 heading data from any independent heading source.
• Fulfils the IMO requirements for using autopilot.
• Rugged, marinised aluminium alloy housing.
• Independently tested to IEC60945: 2002 by T\u00dcV Product Service Ltd.

Overview:
The MD76/8 Heading Monitor by Marine Data is an off-course safety alarm designed for seagoing vessels. An audible and visible alarm is activated at the steering position whenever a vessel deviates from a chosen course by more than a pre-set amount (in degrees). A heading monitor is a very important aid to safety at sea and is now a requirement by the IMO whenever an autopilot is installed.

Special Features:
• The MD76/8 can accept a NMEA digital heading sentence from any independent heading source and may use the heading source to monitor any heading deviations.
• On/Off activation can be linked with activation of an autopilot.
• Remote trigger circuit for an external alarm sounder.
• MD76/8 generates an audible and visible alarm when main power failure is detected. The unit will then automatically switch to the appropriate backup supply.

Application:
• The MD76/8 generates an audible and visible alarm when the vessel deviates from a chosen course by more than a pre-set amount (in degrees).
• The MD76/8 is flexible in application and can be incorporated into a variety of different system configurations. It is especially suited to detecting vessel course deviations as part of a Transmitting Magnetic Compass (TMC) system or an Electromagnetic Compass System (EMC).
Specification:

Physical:
• Weight: 1.85kg.
• Dimensions: Overall width 235mm; overall length 180mm; overall height 145mm (with unit level on mounting bracket).
• Mounting: Panel mounted or bracket mounted.
• Connections: 2x 12-way internal screw terminal connectors.
• Construction: Aluminium enclosure.
• Standard Colour: Jet Black RAL9005; fine textured finish.

Electrical:
• Power supply: 24V DC main supply and 24V DC separate backup supply.
• Data input: Digital RS422 NMEA 0183; 4800 Baud; 1 start bit; 8 bits; no parity; 1 stop bit.
• Data sentences detected: HDT, HDG and HDM; detected on start-up in ascending order of priority.
• Data outputs: Audible and visible alarm.
• DC remote alarm trigger (rated at 24VA): mutually exclusive normally open (NO) and normally closed (NC) loop circuits.
• Autopilot remote On/Off control link (terminals B1 & B2): Must be kept normally closed (NC) for the MD76/8 to operate.
• Cable requirements: Data cable 7/0.2 (7 strand, 0.2mm\u00b2); Power supply cable 24VA rated; Autopilot remote On/Off control link (NC) & external sounder trigger cable 24VA rated.

Operational:
• Performance: \u00b11\u00b0 accuracy.
• Follow up rate: Limited by compass follow up rate.
• Display: Visible alarm.
• The course width selector chooses an allowable course deviation of 4\u00b0, 6\u00b0, 8\u00b0, 12\u00b0, 16\u00b0 or 20\u00b0
• Alarm loudness 90dB at 30cm (ref 20\u00b5Pa).

Environmental:
• Water resistance rating: IP54.
• Operating temperature: -10℃ to 70℃ .

Manufacturer: Marine Data Sensors/Repeaters