DH-IIG Electromagnetic-Controlled Gyrocompass

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Product Details

I. Product Overview

The DH-IIG electromagnetic-controlled gyrocompass is a compact gyrocompass that employs electromagnetic control and electromagnetic compensation. It can automatically and rapidly locate true north and track the geographic meridian plane, providing continuous and reliable heading information on board ships. It is suitable for all types of vessels and auxiliary military ships.

The performance of the DH-IIG electromagnetic-controlled gyrocompass fully complies with the requirements of the national standard GB/T 4300-2007, “Marine and Offshore Technology—Marine Gyrocompasses,” and has been type-approved by the China Classification Society.

II. Main Features

Stable and reliable

Simple operation: One switch, one step—entire startup procedure completed automatically.

Fast stabilization: With an initial deviation of around ±30°, the compass can stabilize within 0.7° within one hour.

High precision: The vertical and horizontal axis drift of the gyroscope is precisely compensated, and latitude errors are automatically compensated by an integrator.

The instrument is compact and lightweight, and can be installed in the bridge or the chartroom. The main compass can also be installed in combination with an autopilot.

Easy maintenance: Each circuit board is equipped with test ports, and both the main gyrocompass cover and the surrounding side panels can be opened. Additionally, the gyrocompass table can be flipped up, making repairs extremely convenient.

Various specially configured compasses are available upon request.

III. Main Technical Specifications

Accuracy metric

Stability point error: ±0.75° × SecΦ

Heading deviation 0.25° × Sec Φ

Stability point error repeatability accuracy: 0.25° × SecΦ

Constant-speed straight-course error: ±1° × Sec Φ

The error caused by a rapid change in speed of 20 kN is ±1.5°.

At a speed of 20 knots, the error caused by a rapid 180° change in heading is ±2.5°.

Performance indicators

The gyro ball has a service life of 15,000 hours.

Mean Time Between Failures (MTBF): 5,000 hours

Mean Time To Repair (MTTR): 0.5 hours

Fast stabilization time: 1 hour (initial deviation: 30°)

Use latitudes from 0° to 70° North and South.

Use a speed range of 0–40 knots.

Suitable for marine electrical systems, 50 Hz, 220 V

The compass consumes less than 150W (no-load).

Heading transmitter, torque-type transmitter excitation: 50 Hz, 110 V

Three-phase 0–50V

Conversion rate: 1:360

Can carry 12 sub-compasses.

4. Instrument Accessories

DH-IIG Type Electromagnetic Control Gyrocompass Matching Table

Serial number	Instrument Name	Instrument code	Matching quantity	Remarks
1	Main compass	D1-IIG	1 unit
2	Power box	D4-IIG	1 unit
3	Sent box	D5-IIG	1 unit	With a 50Hz load
4	Tool and spare parts box	D10-IIG	1 unit
5	Heading gyrocompass	38-1	As needed	50Hz Excitation Compass
6	Azimuth compass	19-1	As needed	50Hz Excitation Compass
7	Azimuth compass stand	20-1	As needed	Match 19-1
8	Junction box	15-1	As needed
9	Optical azimuth instrument	HGF-239	As needed	Compatible with 19-1
10	Azimuth instrument	GFD-188	As needed	Compatible with 19-1
11	Digital gyrocompass	GC-200	As needed	Output NMEA0183 signals
12	Emergency power supply	D9C-II	As needed	Avoid power interruption during battery swapping.