System Overview: Teledyne TSS Meridian Standard Gyrocompass
The Teledyne TSS Meridian Standard (carrying the storied pedigree of S.G. Brown) is an industry-benchmark dry-tuned marine gyrocompass engineered for commercial shipping, workboats, tankers, and offshore vessels. Utilizing a high-precision Dynamically Tuned Gyroscope (DTG) element in a dry sealed sensor chamber, the Meridian Standard completely eliminates the mess, container leaks, and fluid top-up maintenance associated with liquid-floating gyrospheres.
With an exceptional operational MTBF exceeding 30,000 hours, a rapid cold-start settling time under 45 minutes, and a compact monoblock aluminum chassis, the Meridian Standard delivers unmatched reliability and low cost of ownership across global commercial shipping routes.
Technical Specifications: Meridian Standard
| Parameter | Specification Details |
|---|---|
| Sensor Principle | Dynamically Tuned Gyroscope (DTG) / Dry element with zero fluid requirements |
| Settle Time | < 45 minutes from cold start (no gimbal warm-up or fluid stabilization delay) |
| Static Accuracy | ≤ 0.1° secant latitude (IMO A.424(XI) & Wheelmark MED compliant) |
| Dynamic Accuracy | ≤ 0.3° secant latitude under heavy sea state conditions |
| Follow-Up Speed | Up to 200°/second tracking capability |
| Heading Interfaces | 4x RS-422 NMEA 0183 ($HEHDT, $HEROT up to 50 Hz), 1x Step (24V DC), 1x Synchro, Alarm contacts |
| Power Input | 24 V DC nominal (18–36 V DC); optional 115/230 V AC auto-sensing power adapter |
| Power Consumption | Approx. 35 W steady state (60 W starting) |
| Chassis Rating | IP54 splashproof enclosure with integrated vibration isolators |
Core Units, PCBs & Field Replaceable Spares
| Subsystem / Part | Part Number | Description & Function |
|---|---|---|
| DTG Sensor Element | TSS-MER-SEN-01 | Factory-calibrated Dynamically Tuned Gyroscope sensor core |
| Main Processing Board (CPU) | TSS-MER-PCB-CPU | Digital signal processor computing heading, ROT, and latitude error |
| Display & Keypad Module | TSS-MER-DSP-MOD | Front-panel high-contrast digital heading readout with pushbuttons |
| Power Supply Board (PSU) | TSS-MER-PCB-PWR | DC/DC power conditioning PCB with reverse polarity and surge protection |
| Synchro / Step Driver PCB | TSS-MER-PCB-REP | Amplifier board driving legacy bridge repeaters and autopilots |
| Internal Shock Mount Kit | TSS-MER-MNT-KIT | Set of 4 elastomer vibration dampers isolating the DTG sensor core |
| Chassis Cooling Blower | TSS-MER-FAN-DC | Long-life brushless DC cooling fan maintaining thermal stabilization |
Seanav Maintenance Standards for Meridian Standard
Because the Meridian Standard requires no annual supporting fluid overhauls, service focuses on electronic diagnostics and electro-mechanical integrity:
- Annual Performance Check (APC): Interrogating diagnostic BITE registers, verifying DTG rotor spin frequency, and checking internal power supply ripple voltages.
- Dynamic Drift Verification: Validating heading repeatability and rate of turn ($HEROT) accuracy on our digital precision rate table.
- Bridge Distribution Testing: Verifying RS-422 telegram amplitude and baud rate compliance into ECDIS, RADAR, Autopilot, and VDR systems.
- Shock Isolator Inspection: Inspecting internal elastomeric mounts to ensure isolation against vessel hull vibration.
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