Marine certified 4-20mA pressure transmitters are essential for monitoring critical systems on ships. These specialized instruments, approved by classification societies like Lloyd’s Register and DNV, ensure reliable pressure measurement in demanding marine environments. This page explores the features, benefits, and applications of these vital components in maintaining vessel safety and performance.
DMK457 Marine Approved Pressure Transmitter - Marine approved pressure transmitter with 4-20mA current loop output for shipbuilding with optional CuNiFe housing for sea-water compatibility
DMK 458 Seawater Low Range Pressure Transmitter - Sea water corrosion resistant low range pressure transmitter for marine, ship and offshore engineering.
LMK 487 Submersible Ballast Tank and Draught Level Pressure Transmitter - A 22mm diameter titanium body seawater depth and level probe with a 4-20mA output with Lloyds and DNV-GL ship approval, for monitoring the quantity of ballast or the draft of a ship’s hull.
DMP457 Marine Approved Pressure Transmitter - Marine approved stainless steel diaphragm pressure transmitter with 4-20mA current loop output for shipbuilding in ranges from 100mb to 600 bar gauge or absolute.
Find out more about Ship Use Certified Pressure Transmitters to determine which product options and capabilities will best meet your application requirements.
Pressure transmitters are crucial components in various shipboard systems, providing accurate pressure measurements for liquids, vapors, and gases. To ensure the safety and reliability of these systems, especially in harsh marine environments, pressure transmitters must meet stringent requirements and undergo rigorous certification processes.
Marine Classification Societies and Approvals
Marine classification societies play a vital role in ensuring the safety of ships and marine structures. These independent organizations establish and maintain technical standards for the design, construction, and operation of vessels. Some of the leading classification societies include:
- Lloyd’s Register (LR)
- Germanischer Lloyd (GL)
- Det Norske Veritas (DNV)
- American Bureau of Shipping (ABS)
- China Classification Society (CCS)
When selecting pressure transmitters for marine applications, it is essential to choose devices that have been certified by the same classification society that audited and registered the vessel. This ensures compatibility and compliance with the specific standards and regulations applicable to the ship.
4-20mA Current Loop Output
Pressure transmitters for marine use typically employ a 4-20mA current loop output signal. This widely accepted standard in industrial automation offers several advantages in marine environments, including:
- Immunity to Noise: The 4-20mA current loop signal is less susceptible to electrical noise and interference, which is prevalent in shipboard environments due to the presence of various electrical and electronic equipment.
- Long Distance Transmission: The current loop allows for reliable signal transmission over long distances without significant signal degradation, making it suitable for large vessels.
- Fault Detection: The 4mA minimum current provides a “live zero” indication, enabling easy detection of sensor or wiring faults.
Applications
Pressure transmitters are used in a wide range of shipboard applications, including:
- Engine Room Monitoring: Monitoring lube oil pressure, fuel oil pressure, and cooling water pressure in the main engine and auxiliary machinery.
- Cargo Monitoring: Measuring the pressure of liquid or gaseous cargo in tanks to ensure safe loading and unloading operations.
- Ballast Systems: Monitoring ballast tank pressures for proper vessel stability and trim control.
- HVAC Systems: Controlling the pressure of air conditioning and ventilation systems for optimal passenger and crew comfort.
- Firefighting Systems: Monitoring water pressure in fire suppression systems to ensure their readiness in emergencies.