CGF-165W Marine Reflecting Magnetic Compass

Structure of Marine Magnetic Compass:
In addition to the compass bowl, deviation correctors, and compass binnacle that constitute the marine magnetic compass, there are also some structural components and features. To avoid the impact of weather or other temperature factors on the compass, some magnetic compass bowls are designed with two layers: the upper layer holds the compass card and is filled with liquid, while the lower layer also contains a certain amount of liquid but with some empty space. The upper and lower layers are connected by small pipes to allow for adjustment of the compass bowl. Some magnetic compass bowls also have shims at the bottom, in addition to counterweights, as another adjustment measure. These specific structures provide the compass bowl with better temperature stability.
The liquid used in magnetic compasses is typically a mixture of alcohol and distilled water, which fills the compass bowl. The liquid's properties include a low freezing point, ensuring minimal changes in characteristics under normal temperature conditions.

Main Technical Data:
Item
Data
Dial Diameter Φ165 mm
Dial Graduation 0°～360°, 1° per division
Operating Temperature -25℃~+60℃
Pointing Error (H=35μT, T=20±3℃) ≤0.5°
Half Period (H=35μT, T=20±3℃) ≥8.62 S
Friction Error (H=35μT, T=20±3℃) ≤0.09°
Main Semicircle Deviation Correction Range 1°～45°
Secondary Semicircle Deviation Correction Range 1°～6° (Magnetic Dip Q=45°)
Quadrantal Deviation Correction Range 0.5°～10°
Heeling Error Correction Range －75～＋75μT
Telescope Extension Range ±100mm
Dial Image Magnification ≈1.5x (original dial graduation)
Lighting Power Supply AC 110-220V, DC 24V
Overall Dimensions 720×420×1330mm (excluding telescope length)
Mounting Hole Dimensions Hole Spacing 442, Hole Diameter Φ46
Total Weight 60kg