As per Resolution MSC.95(72), the following are the requirements for aldis lamp or the daylight signalling lamp.
1) CARRIAGE REQUIREMENTS OF ALDIS LAMP
As per SOLAS ch V, Regulation 19, all ships of over 150 tons gross tonnage, when engaged on international voyages, shall have on board an efficient daylight signalling lamp which shall not be solely dependent upon the ship’s main source of electrical power
2) FUNCTIONAL REQUIREMENTS OF ALDIS LAMP
1) Daylight signalling lamps should be suitable for giving light signals, which can be clearly distinguished visually as separate signals by an observer.
2) By day and with an atmospheric transmission of 0.8, the visibility of light signals emitted by daylight signalling lamps should be at least 2 nautical miles, equalling a required luminous intensity of 60,000 cd.
3) The axial luminous intensity of daylight signalling lamps should reach at least 90% of the maximum luminous intensity.
4) The luminous intensity of daylight signalling lamps should have its maximum in the centre of the luminous intensity distribution. It should decrease evenly from the centre of luminous intensity distribution.
5) The effective light emission sectors of daylight signalling lamps should be circular. The sum of switch-on and switch-off times should not exceed 500 ms.
6) Daylight signalling lamps should be provided with an indication of their operational status.
3) OPERATIONAL REQUIREMENTS OF ALDIS LAMP
1) Daylight signalling lamps and any battery required for operation should be designed in such a way that safe handling in the intended application is ensured. The daylight signalling lamp should be capable of being operated by personnel wearing gloves.
2) The operational controls of daylight signalling lamps should meet the requirements of the applicable international standards.
4) DESIGN AND INSTALLATION
1) The illuminant should be safely fitted in the daylight signalling lamp; use of screwed sockets should be avoided.
2) Daylight signalling lamps should be designed in such a way that the illuminant can be easily replaced also in the dark.
3) The sighting mechanism should be mounted in a fixed attitude, parallel to the optical axis.
4) All parts of daylight signalling lamps should be made of anti-magnetic material.
5) Daylight signalling lamps should be so constructed that the accumulation of condensed water is avoided.
6) The materials used should withstand heat generation during operation.
7) Daylight signalling lamps should not be solely dependent upon the ship’s main or emergency sources of electrical energy.
8) Daylight signalling lamps should be provided with a portable battery with a complete weight of not more than 7.5 kg.
9) The portable battery should have sufficient capacity to operate the daylight signalling lamp for a period of not less than 2 h.
5) BACK-UP AND FALL-BACK ARRANGEMENTS OF ALDIS LAMP
Each daylight signalling lamp should be provided with at least three spare illuminants complying with the type-tested illuminant. The outer parts of daylıght signallıng lamps should not reach temperatures during operation which restrict their manual use.
6) MARKING AND IDENTIFICATION REQUIREMENTS OF ALDIS LAMP
1) Daylight signalling lamps should be marked clearly and durably with the following data:
A) identification of the manufacturer;
B) equipment type number or model
C) identification under which it was type tested and serial number of the unit.
2) On the illuminant, the manufacturer’s label and the voltage and power consumption should be marked clearly and durably.
7) DOCUMENTATION REQUIREMENTS OF ALDIS LAMP
Daylight signalling lamps should be delivered complete with their technical documentation. Such documentation should include the following information, if applicable:
General information:
A) manufacturer
B) type designation
C) general description of the equipment
D) ancillary equipment and description.
Instructions for operation of equipment:
A) general information on mains connection
B) power supply data (voltage, power consumption)
C) description of start-up procedures
D) description of ways of checking the parallel adjustment of sighting mechanism and luminous intensity axis.
Troubleshooting, maintenance and service:
A) description of illuminant replacement
B) description of adjustment of sighting mechanism
C) special tools required, maintenance material and spare parts (c.g. spare illuminants, fuses, mirrors and covers):
equipment care and maintenance on board
D) available services.
In addition to the ask the above, Daylight signalling lamps should further meet the requirements of resolution A.694(17) and the applicable international standards. With this, we finish this article on requirements of Aldis lamp.
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Ref : Resolution MSC.95(72) & SOLAS
