Model RT-13P251 Submersible Mid Draft Pressure Sensor is custom-designed for ocean-going vessels’ mid-hull draft measurement. Made of full 316L stainless steel with flange mounting, IP68 fully submersible waterproof structure, converts seawater hydrostatic pressure into standard 4-20mA signal, real-time transmits ship mid draft data to cabin remote tank monitoring system. Widely equipped on bulk carriers, container ships, offshore engineering vessels for draft, trim & stability control.
The vessel draft pressure sensor model RT-13P251 level transmitter is engineered for precise draft measurement at the mid-hull section of ocean-going vessels. Its primary users are naval engineers, shipbuilders, and marine equipment procurement professionals requiring reliable data on vessel trim and draft. Operating successfully in harsh marine environments, this equipment enables real-time monitoring by marine operators and offshore platform managers. The device’s compliance with relevant classification and marine standards positions it as an essential component for fleet management systems and integrated marine draft monitoring system supplier frameworks. Its submersible design facilitates straightforward installation during vessel newbuilds or retrofits, enhancing operational oversight for bulk carriers, container ships, and specialized maritime platforms.
This advanced marine sensor is constructed from corrosion-resistant 316L stainless steel, guaranteeing durability under continuous seawater immersion. The RT-13P251 level transmitter delivers a 4-20mA two-wire output signal compatible with existing vessel monitoring consoles, supporting seamless system integration. Its measurement range can be customized from 0 to 10 meters of seawater pressure, achieving an accuracy of ≤0.25% Full Scale. The sensor incorporates an IP68 rating and a vulcanized integral cable joint to prevent water ingress, ensuring long-term operational reliability. With an operating temperature range of -20℃ to +70℃, it suits diverse marine environments. Certified by CCS and compliant with IMO standards, the sensor provides traceable hull identification, further facilitating maintenance and regulatory adherence.
Widely adopted by shipbuilders and marine operators, this vessel draft pressure sensor supports critical applications, including ballast tank management, trim control, and draft stability assessment. Its integration into marine draft monitoring system supplier offerings enhances real-time data acquisition, improving navigation safety and fuel efficiency. Offshore platforms leverage the sensor for stability monitoring under dynamic sea conditions. Additionally, the RT-13P251 level transmitter strengthens vessel performance monitoring in loading and unloading operations on bulk carriers and container vessels. By enabling precise and stable draft readings without extensive hull modifications, it supports operational uptime, regulatory compliance, and vessel lifecycle management in challenging maritime environments.
Technical Specifications
Model No.: RT-13P251
Application: Ship MID DRAFT (Mid Hull Draft Monitoring)
Measuring Medium: Seawater, offshore brackish water
Measuring Range: Customizable 0~5m / 0~10m seawater
Output Signal: 4–20mA 2-wire
Accuracy: ≤0.25%FS
Material: Sensor Body & Flange: 316L Stainless Steel
Protection Grade: IP68, long-term underwater immersion
Operating Temp: -20℃ ~ +70℃
Cable: Marine shielded waterproof cable, customizable length
Installation: Flange fixed on ship hull outer plate
Certification: Support CCS Marine Product Certification
Serial Number: Custom engraved serial number for ship hull tracking
Key Features & Benefits
✅ Custom RT-13P251 Model For Ship MID DRAFT Measurement
✅ Full 316L Stainless Steel Body & Flange, Anti-seawater Corrosion, Anti-marine organism adhesion
✅ IP68 Deep Submersible Sealing, Integral vulcanized cable joint, zero water penetration risk
✅ Standard 4-20mA 2-wire signal, compatible with all marine remote level monitoring consoles
✅ High precision ≤0.25%FS, stable reading under rough sea & fluctuating seawater temperature
✅ Heavy-duty marine shielded cable, anti-electromagnetic interference on ship engine room
✅ CCS China Classification Society certification compliant, meets IMO marine equipment standards
✅ Flange mounting design, easy hull outer plate installation, customized cable length available
✅ Factory customized service: range, cable length, hull label marking for shipyard projects
Structural and Design Strengths
The vessel draft pressure sensor is designed with robust 316L stainless steel material combined with an IP68 waterproof rating, forming a highly durable yet compact unit. The flange-mounted configuration allows secure and stable hull attachment, minimizing installation complexity and facilitating system integration into existing marine draft monitoring system supplier architectures. The sensor’s vulcanized cable joint eliminates risk of water ingress, a critical feature for underwater applications. Modular wiring options with customizable cable lengths ensure adaptability for various vessel configurations. Overall, the design prioritizes corrosion resistance, physical strength, and ease of retrofit, making this sensor a reliable structural component in marine draft management systems.
Performance Efficiency and User-centric Features
With an accuracy threshold of ≤0.25% Full Scale, the RT-13P251 level transmitter delivers precise draft and trim data essential for navigation and stability calculations. The 4-20mA standard output supports compatibility with a wide range of marine remote monitoring consoles, enhancing usability. Its operation within a wide temperature range (-20℃ to +70℃) ensures consistent performance across diverse marine climates. The sensor’s real-time data capabilities reduce response times to trim variations, enabling proactive ballast control. User maintenance is simplified through certification-backed traceability and accessible flange mounting, providing value in reducing downtime and optimizing vessel safety protocols integrated by marine draft monitoring system supplier solutions.
Working Principle
The RT-13P251 mid draft sensor is a hydrostatic submersible level transmitter. When installed outside the ship mid hull, the bottom pressure diaphragm senses seawater static pressure, pressure value is linearly proportional to seawater depth. Internal high-stability circuit converts pressure signal into standard 4-20mA analog signal, transmits draft depth data to cabin control panel continuously, so crew can read real-time mid draft, calculate average draft and vessel trim.
Application Scenarios
1. Mid-hull draft monitoring for all ocean commercial vessels: bulk carrier, container ship, tanker, general cargo ship
2. Offshore engineering vessels, floating platforms draft measurement
3. Vessel ballast tank remote monitoring system supporting equipment
4. Shipyard newbuilding project custom draft sensor (support hull No. marking like XY117)
5. Vessel stability, trim, load draft real-time data acquisition for captain & engine room control
Mid-hull Draft Monitoring on Ocean-Going Cargo Vessels
In the bulk carrier and container shipping sector, monitoring the vessel draft accurately during loading and unloading is pivotal for safe and efficient operations. The vessel draft pressure sensor equipped with the RT-13P251 level transmitter serves as a core component in these vessels’ marine draft monitoring system supplier solutions, delivering precise hydrostatic pressure data at mid-hull. Its rugged IP68 design withstands continuous seawater exposure while providing stable and reliable draft readings crucial for ballast tank adjustments and trim control. By integrating these sensors within ship monitoring networks, operators ensure compliance with maritime safety regulations and optimize ballast management workflows, enhancing cargo safety and voyage economy.
Offshore and Floating Platform Stability Management
In offshore engineering environments, maintaining correct vessel trim and stability is critical amid variable sea states. The vessel draft pressure sensor is employed to monitor hydrostatic pressure changes, feeding accurate draft information to onboard control systems. Marine draft monitoring system supplier providers incorporate this sensor to enable continuous stability assessments and remote monitoring, aiding safety-critical decisions and operational adjustments. Its robust design and compliance with CCS and IMO standards allow deployment in challenging offshore conditions without sacrificing accuracy or reliability. Integration with ballast tank and platform control systems contributes to enhanced dynamic response capabilities and marine asset protection during extended deployments.
Structure Components:
316L stainless sensor body + anti-corrosion pressure diaphragm + vulcanized waterproof cable head + stainless mounting flange + marine heavy-duty shield cable
Maintenance & Daily Care
1. Routine Daily Inspection
①Check display value of draft monitoring console
Observe mid-draft reading continuously; if data jumps drastically, drifts or shows no signal, inspect the sensor and cable immediately.
②Cable appearance check
Inspect cable route along hull outer plate & cable tray: no abrasion, crack, oil corrosion or sharp bending. Avoid heavy compression from ballast water pipes and hull structures.
③Flange mounting tightness
During dry dock inspection, check all flange bolts for loosening, rust or water seepage at the welding joint between flange and hull plate.
④Junction waterproof head inspection
The vulcanized rubber cable joint must be intact, no cracking, peeling or seawater infiltration traces. Damaged rubber head will cause circuit short failure.
2. Dry Dock Maintenance (Every 1–2 Ship Drydocking Cycles)
①Sensor disassembly & surface cleaning
Remove the sensor from hull flange, use soft brush + fresh water to clear marine attachments (barnacles, algae, shellfish) on stainless steel body and pressure diaphragm.
Warning: Do not scrape diaphragm with hard metal tools to avoid permanent measurement damage.
②Diaphragm corrosion inspection
Check the bottom pressure sensitive diaphragm for pitting corrosion, perforation or deformation. Replace the sensor if corrosion spots penetrate the membrane.
③Seal & waterproof rework
Clean flange sealing surface, replace aging rubber gaskets; apply marine anti-rust sealant evenly on bolt threads.
④Cable full test
Use multimeter to test 4–20mA signal circuit continuity and insulation resistance. Replace cables with broken shielding layer or internal core wire breakage.
⑤Label & serial number protection
Wipe the metal nameplate with anti-salt spray cleaner, repaint faded text to avoid model RT-13P251, hull No. and serial number being unrecognizable.
3. Long-term Storage Maintenance (Spare Sensors Onboard)
①Store spare sensor in dry, ventilated cabin, avoid direct salt fog & high temperature near engine room.
②Wrap cable joint and diaphragm with anti-corrosion plastic film; apply anti-rust oil on flange metal surface.
③Conduct signal test once every 3 months for standby sensors to guarantee emergency replacement availability.
