IMO PERFORMANCE STANDARDS FOR ECHO SOUNDER
IMO PERFORMANCE STANDARDS FOR ECHO-SOUNDING
EQUIPMENT
(FOR PHASE-II MMD EXAMINATION PURPOSE)The purpose of echo sounding
equipment is to provide reliable information on the depth of water under a
ship to aid navigation in particular in shallow water. Echo sounding
equipmentshould comply with the following performance requirements. These
Performance Standards areapplicable for ship speeds from 0 up to 30 knots.
Sound speed in water for the purpose of this standard is set at 1500 m/s:
1.Under normal propagation and sea bed reflectibility conditions
the equipmentshould be capable of measuring any clearance under the transducer
between 2 mand 200 m.
2.The equipment should provide a minimum of two range scales one
of which, theshallow range, should cover a range of 20 m, and the other,
the deep range, shouldcover a range of 200 m.
3.The function of range scale selection should be directly
accessible. The settings forthe following functions should be recognizable in
all light conditions:a.
---- range scale , andb.
---- preset depth alarm.4.
The scale of display should not be smaller than 5.0 mm per
meter depth on
theshallow range scale and 0.5 mm per meter depth on the deep range scale. .5.
The primary presentation should be a suitable graphical
display which provides theimmediate depth and a visible record of soundings.
The displayed record should,show at least 15 min of soundings. Other forms
of display may be added but theseshould not affect the normal operation of
the main display.6.
It should be possible to record on paper recording or other
means the informationabout:i.
the depth(s), andii.
the associated time for 12 h.There should be means to retrieve
the recorded information.
7.
The graphical display should be capable of showing:i.
depth marks at intervals not larger than one-tenth of the
range/scale inuse; andii.
time marks at intervals not exceeding 5 min.
8.
If paper is used for recording either by marks on the
recording paper, or by othermeans, there should be a clear indication when the
paper remaining is less than 1 m.
9.The pulse repetition rate should not be slower than
12 pulses per minute on thedeep range and 36 pulses per minute on the
shallow range.10.
Output(s) should be available from which depth information may be
supplied toother equipment such as remote digital displays, voyage data
recorder and a trackcontrol system. These outputs should be
digital, serial communication, facilitieswhich should comply with
the relevant international standards.11.
More than one transducer and associated transmitter-receiver may
be fitted. If more than one
transducer is used:i.
means should be available to display the depths from the
differenttransducers separately.ii.
a clear indication of the transducer(s) in use should be
provided.12.
The performance of the equipment should be such that it will
meet therequirements of these performance standards when the ship is
rolling + 10° and/orpitching + 5°.13.
Based on a sound speed in water of 1,500 m/s, the tolerance
of the indicated depthshould be either: - + 0.5 m on the 20 m range scale,
respectively + 5 m on the 200 mrange scale; or - + 2.5% of the indicated
depth, whichever is greater. (error)14.
An alarm signal - both visual and audible with mute function
- should be providedwhen the water depth is below a preset value.15.
Alarm signals, both visual and audible (with mute function) to the
navigator on thewatch should be provided to indicate failure or a reduction in
the power supply tothe echo sounder which would affect the safe operation of
the equipment.
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