DCU 408E, DCU 410, DCU 410E, RP 410E, RP 420E, RP 480i, RIO 410, RPS, SDU 404, SDU 410, SDU 420, Marine Pro - 400 Series
DCU 408E, DCU 410, DCU 410E, RP 410E, RP 420E, RP 480i, RIO 410, RPS, SDU 404, SDU 410, SDU 420, Marine Pro - 400 Series by Auto-Maskin AS. DNV TA certificate TAA00000Z6.
Inspector Detail
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Common issues
- Radar antenna or stillwell fouling from cargo vapour condensation or wax/paraffin buildup, reducing signal return
- Stillwell/bypass chamber blockage giving false or frozen level readings
- Signal cable or gland corrosion at deck penetrations causing intermittent readings
- Firmware mismatch between sensor unit and display/deck control unit after a partial system update
- Loss of communication on the tank gauging bus after a power supply or UPS fault
- Calibration drift after tank cleaning or coating work carried out near the sensor
Inspection checklist
- Verify displayed level against an independent means (sounding pipe or portable gauge) before cargo operations
- Check antenna/stillwell for deposits, condensation or physical damage during tank inspection
- Inspect cable glands and junction boxes at deck penetrations for corrosion and water ingress
- Confirm high-level and high-high alarm setpoints match the cargo plan and are tested
- Check power supply/UPS backup status and battery condition
- Review the system event log for repeated communication faults or sensor dropouts
- Confirm software/firmware version consistency across sensor and display units
Service intervals
| Antenna/stillwell visual check | each cargo operation or at least every 3 months |
| Independent level verification against a reference gauge | before each cargo transfer |
| Cable gland and junction box inspection | annually |
| Firmware/software version check | at planned maintenance and after any unit replacement |
Critical spares
- Antenna/sensor unit (model-specific)
- Signal/display unit
- Cable glands and terminal kit
- UPS battery for the gauging system
- Fuses and surge protection modules
- Junction box seals
Safety
- A false low or high reading during loading/discharge can lead to tank overfill or dry-running of cargo pumps
- Work on the stillwell/antenna often requires tank entry or hot-work precautions - follow the vessel's permit-to-work system
- Electrical work on the sensor circuit in a hazardous area zone requires a gas-free certificate and intrinsically safe tools
Class survey
Cargo tank level and overfill alarm systems on tankers fall under the vessel's cargo system survey requirements; class typically expects functional testing of level and high-level alarms, verification against an independent gauging method, and calibration records retained onboard. Log any sensor replacement and re-verify readings before the next cargo operation.
Components & Design
Component data being added…
Technical Data
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