Standard 30 MF Gyro Compass

Standard 30 MF Gyro Compass (HRG)

The Anschütz Standard 30 MF Gyro Compass is the second generation of maintenance free gyro compasses from Raytheon Anschütz based on hemispherical resonator gyro (HRGs) technology.

The use of HRG technology together with the simple design makes it extremely reliable with no wear and tear and no need for maintenance. The mean time between failures (MTBF) value of Standard 30 MF is more than 100,000 hours which is a multiple of the MTBF values of optical gyros (such as FOGs).

The HRG technology has already been used in Horizon MF – the predecessor of Standard 30 MF – and has proven its reliability and accuracy in more than one hundred installations. The new Standard 30 MF is even smaller as its predecessor, can be used as rate-of-turn indicator (required for vessels above 50.000 GT according to SOLAS) and features an optimized integration into a Raytheon Anschütz heading management system. With Ethernet and CAN-bus interfaces, cabling efforts are minimized.

The Anschütz Standard 30 MF Gyro Compass has a strong focus on robustness. Among others, Standard 30 MF settles at rough-seas and provides heading output (with reduced accuracy) even if speed and latitude input fails – a significant difference to other compass systems.

For vessel with DP system, Standard 30 MF offers an additional benefit: some classification societies allow to replace a motion reference unit (MRU) with the roll and pitch output of Standard 30 MF. This reduces investment cost but also maintenance cost as no periodical drift calibration is required.

 

Facts & Features

  • High accuracy of 0.25 degrees, ultra-robust design
  • Highly cost-effective over lifetime through maintenance-free technology
  • Superior and durable HRG technology (MTBF >100,000 h)
  • Significantly better longterm stability than an FOG, no drift
  • Heading sensor and MRU in one (roll and pitch output), thus reduction in investment and maintenance cost
  • Settling time of only one hour, settles at rough sea states
  • Heading monitor and selector with automatic switch-over (configurable)
  • Automatic speed / latitude error correction
  • Individual speed error correction
  • Independent transmitting magnetic compass (TMC) path
  • Ethernet interfaces for data communication with Integrated Navigation Systems or Central Alert Management Displays
  • Perfect for installation in newbuild and for retrofit projects or an extension of Standard 22 gyro compass systems
  • IMO approved for standard and high-speed crafts and as rate-of turn indicator

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Electrodes excite the resonator with a certain frequency which results in a stationary vibration pattern. Compared to the example, a finger strike sets the glass into vibration and makes a sound which can even be heard a few seconds later. The vibration pattern can be identified by four points at the ring of the glass that are moving the most – the so-called antinodes. The HRG measures this movement through pick-off electrodes.
If the glass is rotated around its axis – observe the reference point – the vibration pattern also rotates, but not as much as the glass does. In other words: The standing wave of the rotation pattern lags behind and the inertness of this pattern is based on the Coriolis force effect. The same shift of the rotation pattern is caused by a movement of the vessel. Note that the vibration frequency is much higher than the frequencies of the vibration spectrum of vessels and thus not affected adversely by the vessel. The movement is again measured by pick-off electrodes. This is a very simple and accurate way to sense and measure rotation as the degree of the lag is proportional to the angular rate of the movement of the ship.

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Standard 22 Gyro Compass
The Anschütz Standard 22 Gyro Compass is a long time secure and reliable investment in your ship.