Pressure transmitters for many marine and offshore installations need to carry classification society approval, withstand salt atmosphere and vibration, and often also meet ATEX or IECEx requirements. The required approvals, housing materials and protection ratings depend on the vessel type, flag state and installation location. This guide covers the key selection criteria and leads directly into the sensor selector.
Pressure transmitters for marine and offshore installations are typically required to carry type approval from one or more classification societies. These approvals confirm that the device has been tested for suitability in the marine environment — including vibration, EMC, temperature cycling and ingress protection. The required society depends on the flag state, vessel type and owner/operator specification.
Det Norske Veritas. Widely specified for Norwegian, North Sea and international offshore projects. DNV approval is commonly specified for offshore platforms, vessels and North Sea projects.
American Bureau of Shipping. Often specified for US-flagged vessels and projects with American operators. Common in Gulf of Mexico and US offshore applications.
UK-based classification society. Widely recognised internationally, especially for British-flagged vessels and projects in the North Sea and Asia-Pacific.
French classification society with a strong international presence. Common in projects with French operators, and in West Africa, Southeast Asia and the Mediterranean.
Many projects require approval from multiple classification societies, especially for FPSO vessels or international assets. Always verify which societies are specified in the project documentation. Classification society approval covers the device type — not necessarily every configuration or variant. Verify the scope of the certificate against the selected device.
Marine and offshore environments expose pressure transmitters to conditions that are more demanding than most industrial installations. The key environmental factors are:
| Factor | What to consider |
|---|---|
| Salt atmosphere | Accelerated corrosion of housings, connectors and wetted parts. 316L stainless steel is commonly specified for marine environments; duplex stainless, Hastelloy or titanium may be required for high-chloride or more aggressive environments. Connector ingress protection is critical. |
| Vibration | Continuous vibration from engines, pumps and wave action. Verify vibration rating and consider remote diaphragm seal configurations for high-vibration locations. |
| Humidity and condensation | High ambient humidity and condensation on cold surfaces. Verify cable entry, connector sealing and ingress protection for the installation environment. |
| ATEX / IECEx | Many marine and offshore locations are classified hazardous areas. Verify whether ATEX or IECEx approval is also required in addition to classification society approval. |
| Subsea | Subsea pressure transmitters require specialist housings and connectors rated for the installation depth. Depending on the design, pressure compensation and qualification testing may be required. Verify depth rating, connector standard and qualification scope with the manufacturer. |
| Criterion | What to check |
|---|---|
| Classification approval | Confirm which classification societies are required. Verify the certificate covers the specific device variant. Check the certificate is current and valid for the installation country. |
| ATEX / IECEx | Many offshore and marine locations require explosion protection in addition to classification approval. Verify zone classification and required protection concept. |
| Housing material | 316L stainless steel for general marine use. Duplex stainless for high-chloride environments. Hastelloy for aggressive process media or severe marine atmospheres. |
| IP rating | IP66 or IP67 is commonly specified for outdoor marine installations. IP67 or IP68 may be required for locations exposed to spray, washdown or temporary immersion. Connector ingress protection must match the transmitter rating. |
| Output signal | 4–20 mA 2-wire is most common for marine and offshore process measurement. HART for diagnostics and asset management. Verify loop power supply and cable run length. |
| Process connection | Flanged connections common for offshore process lines. G1/2 and NPT for general instrumentation. Flush diaphragm for viscous or fouling media. |
| Temperature range | Verify ambient and process temperature range. Arctic offshore applications may require −40 °C or lower. High-temperature process applications must be verified against the transmitter rating. |
Classification society approval and explosion protection approval are separate requirements. A DNV-approved transmitter is not automatically ATEX-certified. Many offshore installations require both. Verify the complete approval scope against the area classification drawing.
Standard industrial housings and connectors are often not rated for continuous salt atmosphere exposure. Verify that the housing material, surface treatment and connector sealing are suitable for the installation environment, not just the process media.
Classification society certificates are issued for a specific device type and configuration. A certificate for one variant does not automatically cover all variants of the same series. Verify the exact device configuration against the certificate scope before specifying.
Marine installations require attention to housing, connector and cable-gland materials, not only wetted parts. Salt atmosphere can attack external components even when the process media is compatible with the diaphragm and wetted materials. Verify housing material, surface treatment and connector sealing against the installation environment.
Verify before specifying: Always confirm the classification society approval, ATEX/IECEx requirements, housing material, IP rating, wetted materials and temperature range against the official certificates and manufacturer specifications. Pressure Selector provides a shortlist for further evaluation — it does not replace engineering review or certification assessment.
For promising matches, use Request Info on any result to prepare a supplier inquiry based on your application requirements.
Pressure Selector converts application requirements — such as classification society approval (DNV, ABS, Lloyd's, Bureau Veritas), ATEX or IECEx certification, pressure range, output signal, housing material and IP rating — into a structured shortlist of matching pressure transmitters and sensors.
Coverage includes selected pressure transmitters and sensors with marine, offshore or classification-society approvals from manufacturers such as Wika, Danfoss, Endress+Hauser, TE Connectivity, Ashcroft and others. Availability of specific classification society approvals and ATEX/IECEx combinations depends on the selected series and device configuration.