Product category:
Level Sensors and Leak Detectors
News Release from: SensorsOne | Subject: LMK457 tank level sensor
Edited by the Engineeringtalk Editorial
Team on 01 December 2006
Level sensor is approved for marine
duties
The LMK457 tank level sensor measures the hydrostatic pressure of a wide range of liquids that are found on marine vessels such as oil tankers and bulk carriers.
The harsh corrosive environment which level sensors are subjected to on a ship call for a corrosion resistant material 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 sensor 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 level transmitter has many different styles of mounting starting with the simplest, which involves dropping the LMK-457 level transducer down a stilling well to measure the level whilst permanently submerged in the tank.
This is useful for installations where there is no service's access to the sides of the tank.
If a stilling well is not available, the submersible level sensor can include a mounting bracket 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 level transducer has an optional 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 level sensor 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 transmitter's suitability for use in shipbuilding applications it has been subjected to rigorous testing to meet the requirements set by Germanischer Lloyd (GL) and Det Norske Veritas (DNV) for marine approval.
The LMK-457 marine approved level sensor can measure hydrostatic pressure from 0.4 to 250 metres of water gauge with an accuracy of +/-0.175% (0.125% optional improved accuracy) full scale best straight line nonlinearity, 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 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 an endless list of possible configurations for most level measurement applications onboard a sea vessel.
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