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Versatile marine pressure transmitter for hydrostatic tank level

9th June 2007
The harsh corrosive environment which level sensors are subjected to on a ship call for a corrosion resistant construction and robust mechanical design.

The materials employed need to withstand the effects of relentless exposure to seawater and salt spray when installed on the deck or in the ballast tanks of a ship. The design must meet the mechanical integrity requirements for pressure measurement and be robust enough to survive in an uncompromising heavy industry environment.

The LMK457 tank level transmitter measures the hydrostatic pressure of a wide range of liquids that are found on marine vessels such as oil tankers and bulk carriers.

This versatile marine approved hydrostatic level transmitter has many different styles for mounting, starting with the simplest which involves dropping the LMK-457 level transmitter down a stilling well to measure the level whilst permanently submerged in the tank. This is useful for installations where there is no service access to the side of the tank. If a stilling well is not available, the submersible level transmitter has a mounting bracket option for fixing into position on the inside of the tank.

Where maintenance access between tank bulkheads is possible the LMK 457 marine level transmitter can be mounted with a G11/2 male thread or with a flange mountable fitting.

For seawater systems the LMK-457 ballast level transmitter can be made from Copper Nickel alloy construction which has high corrosion resistance to sea-water and can be used on ballast tanks and other seawater pumping systems.

If the vessel is carrying hazardous material which requires IS approved instrumentation such as oil tankers, LPG ships or LNG ships, the LMK 457 level pressure transmitter can be supplied with ATEX approval for intrinsically safe use.

The LMK457 marine approved hydrostatic level transmitter incorporates a capacitive ceramic sensing diaphragm that has a high overpressure. This is useful for cargo ships which carry a variety of chemicals and need to clean the inside of the tank with high pressure caustic solutions.

The flush ceramic diaphragm is also well suited for use with waste water, abrasive material, viscous fluids and corrosive chemicals because of the hardness and inert properties of alumina ceramic.

For added assurance of the LMK457 hydrostatic pressure transmitters suitability for use in shipbuilding applications it has been certified by Germanischer Lloyd (GL) and Det Norske Veritas (DNV) for marine use.

The LMK-457 marine approved level transmitter can measure hydrostatic pressure from 0.4 up to 250 metres of water gauge with an accuracy of ±0.175% full scale best straight line non-linearity, hysteresis and repeatability. The capacitive ceramic sensor provides a high overpressure rating as much as 10 times for some ranges which helps protect the sensor from surge pressures when the tank is being filled or cleaned.

Shipbuilders require flexibility, high reliability and corrosion resistance from the instrumentation they install and the LMK457 level transmitter has been designed for this task with many possible configurations for most level measurement applications onboard a sea vessel.

Related Products

LMK457 product page for more detailed info and pricing queries

Marine approved pressure sensors

Screw-in tank level sensors

Submersible hydrostatic level sensors

Associated Topics

When to use submersible or screw-on hydrostatic level sensors

Calculating the required pressure range for measuring liquid contents of a tank

How to measure hydrostatic fluid level in a sealed tank

Submersible PVC for submerging in aggressive media

Level transmitter for corrosive chemicals

Sensor for measuring shallow depth

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Site Last Updated: 09/02/12

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