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Ruian Shunfeng Navigation Instruments Co.,Ltd

Add: No.20, Heping Road, Jinhu Street, Ruian, Zhejiang, China
Con: april Zhang
Tel: +86-577-65520898
Fax: +86-577-65966926
Mob: +8618158321811
Email: sale@rashunfeng.cn


Principle And Characteristics Of Magnetic Compass.

Magnetic compass is a kind of pointing device which can point to the earth magnetic north (south) pole by using magnetic needle. As an important navigation instrument, magnetic compass has a long history in the installation and use of Marine ships. At present, the modern ship is equipped with a gyroscope (electric Luo Yi), who guide (GPS) and other advanced navigational instruments, but because the modern magnetic compass has simple structure, reliable performance and is not dependent on the characteristics of the external conditions, it is still used as necessary by ocean ship navigation instrument installation. IMO, ship classification society, all countries ship inspection bodies have clearly stipulated that ocean ships should be equipped with magnetic compass, and should correctly correct the deviation and have a deviation table.


1 magnetic compass classification.


A according to whether there is liquid in the compass bowl, there are two types of liquid compass and dry compass. The compass of the liquid compass is suspended in a rotted container filled with liquid. Due to the damping effect of the liquid, the stability of the compass is better when the ship is swinging. In addition, due to the buoyancy effect of the liquid, the friction between the compass support shaft and the bearing can be reduced, thus improving the sensitivity of the compass. Our products are all liquid compass.


B according to the use of magnetic compass, there are standard compass, steering compass. The standard compass is generally upright and mounted on the roof deck of the wheelhouse (compass deck). Because of its high position, no shading, and small influence of ship magnetism, it is used to observe the course and the calibration of object bearing and calibrate steering compass, so it is called standard compass.


The steering compass is usually mounted in the driving room for observing the course and steering. Our company produces standard compass and steering compass.


C according to the diameter of the compass, the commonly used is 190mm,165mm,130mm,100mm.


2 magnetic compass deviation and correction.


The magnetization of the magnetic field of the steel ship will produce the ship magnetism, which will affect the accuracy of the compass pointing, that is, the so-called "deviation". This error can be obtained and corrected by compass. The magnetic compass manufactured by our company is equipped with a high efficiency deviation correction device.


Installation of magnetic compass.


A magnetic compass shall be installed on the midline of the ship as far as possible, and the first line of the compass cabinet shall coincide (or parallel) with the longitudinal midline of the ship.


The minimum distance of b standard magnetic compass and any ferromagnetic substance is 1 meter.


4. Daily maintenance of magnetic compass.


A normal magnetic compass shall be covered with a compass cap (the standard compass shall be covered with a compass cover).


B keep the liquid colorless and transparent and remove the bubbles.


C keep the roller shaft, keep the ring shaft lubrication and rotate flexibly.


D periodically check the semi-cycle of compass, sensitivity, and rehydration of the compass bowl when necessary.


No magnetic objects shall be placed near the e compass. The compass shall not be subjected to high temperature and vibration environment for a long time.