Delta Mobrey Displacer Level Transmitter Mobrey MLT100

Overview of the Mobrey MLT100
The Mobrey MLT100 Level Transmitter is one of the most advanced displacer based devices on the market, coupling the time proven buoyancy principle with state of the art electronics in an instrument of high reliability and stability.
Special care has been taken in design to ensure a small mounting envelope is maintained, resulting in reduced weight and associated savings in mounting.
The displacer element is made to length for each order, and is suspended below the head on a stable spring arrangement which is designed to minimise friction effects and improve performance.
The transmitter can be mounted directly into a vessel or may be externally mounted in a chamber to allow isolation for planned maintenance or in-situ calibration checks.
Operation
The 4–20 mA output from the head is proportional to the level or contents in the vessel, or may be set to follow an interface. The transmitter supports the HART protocol, which is superimposed on the 4–20 mA signal.
Changes of liquid level in the vessel cause the displacer element, which is supported on a spring, to rise or fall. A core, located in the pressure tube of the head, is connected to the displacer and moves linearly up and down with the element. Around the outside of the pressure tube in the head is a Linear
Variable Differential Transformer (LVDT), the output of which is proportional to the position of the core. The pressure tube is made of stainless steel and is welded to the union which connects the head to the process pressure and temperature.
The user can operate the transmitter without digital communications, or can take advantage of the many features of HART such as remote calibration, re-ranging, on-line diagnostics, and multidrop installations
Benefits

•  Low maintenance
•  Simple installation
•  Local or remote calibration

Typical applications

•  Knock-out pots
•  Condensate drums
•  Separators
•  Flash vessels
•  Storage vessels
•  Receiver tanks

Operating wetside temperatures are –60 to 320 °C at pressures between full vacuum and 200 bar. Remote electronics models available to special order for high temperature and nuclear applications.
Most liquids can be measured, with wetted materials chosen to suit. The liquid SG range is from 0.5 to 1.5, and interfaces with as low an SG difference of 0.1 are also practical.
The displacer length is dictated by the operating range requested, and the diameter and weight are factory calculated to ensure the correct operating movement of the core in the
head. The longest standard operating range is 3000 mm.

Special features
Health-check LED
Each transmitter is fitted with a visible LED which flashes once every 3 seconds to show the instrument is healthy and working.
Field adjustments
The transmitter is set up by Delta Mobrey to operate in the conditions advised at the time of order, and the displacer element dimensions are chosen to suit.
Local Calibration (Without a Field Communicator)
Fine-tune adjustments on-site may be made with the instrument in an empty vessel at 20 °C, which ensures correct readings at operating conditions.
Several adjustments can be made using the unique “Mobrey Magnetic Scroller” (MMS) and the “Caliplug”.
The MMS is a calibration tool with a magnetic tip, and is used on this and other Delta Mobrey instruments to access and adjust certain operating parameters.
The MLT100 is fitted with a calibration plug (Caliplug) which contains docking ports for the MMS along with a heartbeat LED.The adjustments which may be made are setting the 4 mA and 20 mA points, and damping.

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