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The EML-500 is an electromagnetic speed log / “speed log system” used to measure the ship’s speed through water using electromagnetic principles.
The system typically comprises several components:
• Master Unit (often LT501)
• Master Indicator (LR523 / LR523F)
• Speed Indicator(s) (analog gauge versions: LR524, LR525)
• Dimmer Box, Junction / Connection Boxes, Sensor / Sea-bottom probes (single or dual axis)
The Master Indicator (LR523F / LR523 series) receives digital data (speed, distance) from the master unit and displays it. It also interprets / displays auxiliary data (trip distance, longitudinal / transverse speed, direction) in a dual-axis system
| Parameter | Specification / Description |
|---|---|
| Model / Part | LR523F (Master Indicator for EML-500) |
| Operating Temperature | –15 °C to +55 °C (operating) |
| Storage / Non-operating Temperature | –20 °C to +60 °C |
| Humidity | Up to 95% RH (non-condensing) |
| Vibration Tolerance | 5–12.5 Hz: ±1.6 mm; 12.5–25 Hz: ±0.38 mm; 25–50 Hz: ±0.1 mm |
| Power / Supply Voltage | The EML500 system (Master Unit) supports 100–115 VAC or 200–230 VAC, ±10%, 50/60 Hz |
| Power Consumption | ~ 80 VA (for full system) |
| Input / Interfaces | • Analog signal (current): 0 → 20 mA or 4 → 20 mA (for external systems) • Pulse output: photocoupler/contact (200 pulses per nautical mile) • Serial/digital output: NMEA 0183 format; internal digital link between master unit & indicator • Analog voltage output: 0 V → 5 V DC or 1 V → 5 V DC (optional) |
| Withstanding / Insulation | • Withstanding voltage: 1500 V AC for 1 min (excluding electronics) • Insulation resistance: ≥ 10 MΩ @ 500 V megger (excluding electronics) |
| Display / Readouts | LED digital display showing: speed (knots), total distance (nm), trip distance, longitudinal & transverse speeds, resultant speed & direction (dual axis), GPS mode, error codes |
| Alarms / Diagnostics | Self-diagnostic error detection; alarm relay contacts (NC/NO) configurable via DIP switches in master unit |
| Memory / Backup | Backup battery (in master unit) stores parameters; data lost if battery is replaced |
| Mechanical / Mounting | Flush-mount (LR523-D) or desk/wall mount (LR523-W) variants available |
| System Modes & Operation | • Display cycling: speed & distance → trip → transverse/resultant → back • LOG/GPS selection (speed source) • Test mode, alarm setup, zero/span calibration, sensitivity adjustment • Supports single-axis & dual-axis sensors • Compatible with sensor diameters Φ35 mm, Φ48 mm, Φ70 mm (single or double bottom installation) |
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