Checking The Transducer Array Flatness And Correcting Deviations - Kongsberg EM 712 Maintenance Manual

Kongsberg EM 712 Maintenance Manual
• No point on the frame may deviate from the ideal plane with more than the tolerance
limit shown in Technical specifications. The limit will vary between the different
multibeam echo sounders.
Ideal plane
A
Installed plane
B
Deviation
C
• The maximum allowed gradient between two adjacent mounting points is 0.1 %.
A Maximum gradient 0.1 % = 1 mm/m
Distance between mounting points
B
Difference in relative height between mounting points
C
The flatness must be controlled by land survey methods, to the highest possible accuracy.
The survey of the flatness can be carried out independently from the survey of the vessel
coordinate system and alignment of the sensors.
Checking the transducer array flatness and
correcting deviations
An overall procedure specifying the main tasks is provided. The detailed knowledge
about how to do the measurements is offered by the consultants doing the work.
Prerequisites
In some occasions a flatness survey of the frame mounting foundations can be
recommended. This will give an indication of how much time and shims will be required.
Context
The maximum allowed gradient between two adjacent mounting points is 0.1 %.
Procedure
1 Mount the mounting frame.
204
451106/B