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Seawater Compatible Sensors

Sensors for use with seawater or protected from salt spray corrosion in marine environments. Select instruments with titanium, ceramic, plastic or marine bronze parts which have a high resilience to corrosion from salt water.

Sensors designed for reliable operation in seawater or marine environments subject to salt spray corrosion demand meticulous material selection to combat the aggressive, chloride-rich conditions. This category features instruments constructed with highly resilient materials such as specific titanium alloys, advanced ceramics like alumina and zirconia, engineered plastics including PEEK and PVDF, and specialized marine bronze alloys. These choices are critical for preventing electrochemical degradation, pitting, and crevice corrosion, ensuring long-term accuracy and durability for applications ranging from oceanographic research and desalination plants to aquaculture monitoring and equipment on marine vessels, where resistance to both direct immersion and atmospheric salinity is paramount.

  • Sea water temperature probe and display for depth to 100 metres - Robust and reliable system for measuring sea water temperature at depths to 100 meters. Features a marine bronze sensor and a wall-mounted display with relay outputs and Modbus communication.
  • Marine air lubrication system submersible seawater resistant air pressure transmitter - Measuring gauge air pressure inside a pipe near an underwater air injector for a ship's drag reduction system. Marine grade pressure sensors provide essential accuracy and seawater resistance for reliable component testing and performance tuning at depths down to 10 meters.
  • DMK457 Marine Approved Pressure Transmitter
  • LMK458 Marine Approved Hydrostatic Level Transmitter
  • STT-26 Submersible Temperature Probe and Transmitter
  • ATM/N Titanium Submersible Hydrostatic Pressure Transmitter
  • Abstraction pump protection using a screw-on hydrostatic level transmitter in a tidal river - Learn about the deployment of a 4-20mA screw-on hydrostatic level sensor for monitoring fluctuating seawater levels. Key aspects include the benefits of a fixed threaded mounting, diaphragm vulnerability without a nose cone, and protecting the atmospheric vent tube.
  • USV fire suppression seawater pressure monitoring using wireless sensor system - Discover how robust wireless pressure transducers and an RS485 gateway provide real-time fire suppression system monitoring on unmanned surface vehicles (USVs), overcoming challenges of seawater, interference, and battery life.
  • Deep water pump motor diagnostics subsea temperature transmitter - Explore a robust solution for monitoring temperature on electric motors submerged 200 meters deep. A subsea transmitter with a high-integrity connector overcomes high-pressure challenges.
  • Floating dry dock ballast tank 14ft range 4-20mA output submersible seawater level sensor - 14ft range submersible level sensor for monitoring the level of seawater in floating dry dock ballast tanks.
  • Underwater 50 metre sea depth 4-20mA output sensor - All titanium underwater sensor for measuring seawater depth with a measurement range of 0 to 50 metres providing a 4 to 20 mA output signal.
  • Harbour seawater level sensor with digital display & relay outputs for tidal applications - Seawater compatible marine bronze level sensor with digital display and relay outputs for for tidal monitoring and controlling pumps and valves in harbour environments.
  • LMK 806 Plastic 21mm diameter Submersible Level Probe
  • DMK 458 Seawater Low Range Pressure Transmitter
  • LMK 487 Submersible Ballast Tank and Draught Level Pressure Transmitter
  • LMK 858 Plastic Submersible Liquid Level Sensor with Removable Cable
  • Dock bridge tidal flap submersible level transmitter with sea water compatibility - Marine bronze submersible level transmitter for reliable depth measurement in dock bridge applications with tidal flaps.
  • Seawater intake channel submersible level sensor with 5m range and 4-20mA output - Marine bronze level sensor with a submersible construction for reliable performance in challenging seawater intake channels.
  • Reverse osmosis desalination plant seawater pressure sensor with 1,500 psig range and 4-20mA output - Ensure efficient operation and prevent membrane damage in your reverse osmosis desalination system with this reliable pressure sensor designed for harsh seawater environments.
  • Desalination plant feed tank submersible level sensor - Highly durable submersible level sensor designed for harsh desalination plant environments. Copper-nickel alloy housing and ceramic diaphragm ensure long-term reliability in aggressive saline conditions. 4-20mA output, 0-5mH2O range.
  • Marine fender air and seawater pressure sender and display - Monitor marine fender pressure with this IP68 marine bronze pressure sensor and high visibility display. Ideal for harsh seawater environments.
  • LMK457 Marine Approved Level Transmitter
  • IMP Ceramic Strain Gauge Pressure Transducer
  • S12C SDI-12 Seawater Pressure & Temperature Transducer
  • SWL Marine Bronze Submersible Level Sensor
  • Sea, Brackish or Salt Water Submersible IP68 Depth & Level Sensors - Explore IP68 submersible depth & level sensors designed for long-term use in sea, salt, and brackish water. Featuring corrosion-resistant materials like Titanium & Ceramic.
  • Sea Water Resistant Pressure Transmitters - Find robust 4-20mA pressure transmitters designed to resist seawater corrosion. Ideal for ship sytems, desalination plants, subsea & coastal monitoring.
  • Sea Water Resistant Ship Use Certified Pressure Transmitters - These pressure transmitters are specifically engineered to handle the harsh conditions found in shipboard and marine environments. Constructed with corrosion-resistant wetted parts suitable for seawater and certified for marine use
  • Brackish Water Hydrostatic Liquid Level Sensors - Brackish water hydrostatic level sensors are specifically designed for continuous submersion in coastal and estuarine environments where fresh and saltwater mix
  • Seawater Hydrostatic Liquid Level Sensors - Submersible hydrostatic level sensors designed for long-term immersion in seawater, engineered with corrosion-resistant materials to withstand harsh coastal and offshore environments.

Find out more about Seawater Compatible Sensors to determine which product options and capabilities will best meet your application requirements.

The selection of appropriate materials is paramount when designing or specifying sensors intended for deployment in seawater or environments prone to salt spray corrosion. The highly conductive and chloride-rich nature of seawater presents a formidable challenge, accelerating various forms of corrosion that can compromise sensor integrity, accuracy, and operational lifespan. Instruments destined for such marine applications necessitate wetted parts and housings constructed from materials demonstrating exceptional resilience to these aggressive conditions.

Titanium alloys, particularly grades like Grade 2 (commercially pure) and Grade 5 (Ti-6Al-4V), are frequently specified due to their outstanding performance. Titanium forms a highly stable, tenacious, and self-healing passive oxide layer (TiO2) that provides excellent protection against general corrosion, pitting, and crevice corrosion, even in deaerated or high-velocity seawater. This inherent resistance makes titanium suitable for critical components such as pressure diaphragms, sensor bodies, and fasteners in long-term subsea deployments, including oceanographic moorings, remotely operated vehicles (ROVs), and autonomous underwater vehicles (AUVs).

Ceramic materials, such as alumina (Al2O3), zirconia (ZrO2), and silicon carbide (SiC), offer another tier of exceptional chemical inertness and corrosion immunity. These materials are not susceptible to electrochemical corrosion and can withstand a wide range of chemical attacks beyond just salinity. Their hardness and wear resistance are also beneficial. Ceramic elements are often employed in sensor faces, insulating components, or as robust transducer diaphragms in applications like conductivity cells, dissolved oxygen sensors used in aquaculture monitoring systems, or within instrumentation for desalination plants where both high salinity and varying chemical concentrations are encountered.

Engineered plastics play a crucial role in seawater compatible sensor design, offering a combination of chemical resistance, electrical insulation, and often a more cost-effective solution for complex geometries. Polymers like PEEK (Polyether Ether Ketone) exhibit remarkable mechanical strength at elevated temperatures alongside resistance to hydrolysis and a broad spectrum of chemicals. PVDF (Polyvinylidene Fluoride) is another excellent choice, known for its high purity, UV resistance, and robust defense against salts and acids, making it suitable for sensor housings or flow-through components in water quality monitoring systems. PTFE (Polytetrafluoroethylene) provides near-universal chemical resistance and low-friction surfaces, while more common plastics like Polypropylene (PP) or PVC (Polyvinyl Chloride) can be effective for less structurally demanding parts or in splash zone applications where constant immersion isn’t the primary concern.

Marine bronze alloys, specifically certain aluminum bronzes (e.g., C63200, C95500, C95800) and nickel-aluminum bronzes (NAB), are also utilized. These alloys form a protective, adherent surface film of aluminum oxide and cuprous oxide, which offers good resistance to seawater corrosion and, importantly, often exhibits a degree of biofouling resistance. This makes them suitable for components like valve bodies, sensor housings on ship hulls, or fittings in seawater cooling circuits. However, careful consideration of galvanic compatibility is essential when incorporating marine bronzes with other metallic materials in a sensor assembly to prevent accelerated corrosion of the less noble metal.

Beyond direct immersion, sensors operating in marine environments, such as those on coastal installations, offshore platforms, or onboard vessels, must also be protected from salt spray. Airborne saline particles can deposit on surfaces, and in the presence of moisture, create a highly corrosive electrolyte. Therefore, the external housing, connectors, and seals of such sensors must also be fabricated from, or adequately protected by, these corrosion-resistant materials to ensure long-term reliability and prevent premature failure in applications like meteorological buoys, structural health monitoring sensors on bridges, or equipment within engine rooms of marine craft. The meticulous choice of these specialized materials ensures that sensors maintain their performance specifications and operational integrity even when subjected to the relentless corrosive forces of saltwater and marine atmospheres.

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