244LD Intelligent Displacer Level (Interface) Transmitter

 Summary displacer level transmitter

244LD intelligent displacer level (interface) level transmitter is designed based on Archimedes Buoyancy Principle. It can be used for measuring liquid level, interface and density. The latest model of FDT/DTM technology can provide online calibration and diagnosis, durable in use. A wide range of material selection is suitable for different medium environment. 244LD intelligent displacer level (interface) transmitter in extreme temperature and pressure conditions can be reliable work. This Transmitter is available for any dangerous application. 244LD intelligent displacer level (interface) transmitter is manufactured by Dandong Top Electronics Instrument (Group) Co. Ltd and FOXBORO, The transmitting head and other important parts are original products supplied by FOXBORO, the finished products are as per the original factory standard (FOXBORO).

Operating Principle

The buoyancy of displacer 4 is transmitted to the sensor 3 via lever 1 and the torque tube 2. In measuring range, the voltage is proportional to the buoyancy, and as the input signal is transmitted to the electronic amplifier. Through the electronic amplifier, voltage is converted to 4-20 mA two-wires output signal. In the two-wires system mode, amplifier is powered by the signal current circuit.

Any part of the displacer immersed in liquid is adhering to the principle of Archimedes. By measuring buoyancy change of cylindrical displacer suspended in liquid, you can measure the liquid level, interface level or density.

 displacer level transmitter

When measuring the density and interface level, the displacer should be completely immersed in liquid. The change of the liquid level must be in range area.

The calculation of buoyancy:

FA= VX·ρ1·g+( V -VX) ·ρ2·g

In the formula：FA：Buoyancy

V：The volume of the displacer

VX：In the liquid density of ρ1, the medium volume displacer swaps out 

ρ1：The average of the heavy medium density

ρ2：The average of the lighter medium density

g：The local acceleration of gravity

FG： Buoy its own gravity

displacer level transmitter 

244LD Intelligent Displacer Level (Interface) Transmitter

displacer level transmitter  

Technical features

·Power supply：12～42V DC

·Output Signal：4～20mA/20～4mA

·measurement range：300～3000mm(Beyond the range can be produced)

·nominal pressure：≤42.0MPa

·nominal diameter：DN40 or as customers’ request

·ambient temperature：－40℃～+85℃

·operating temperature：－196℃～+500℃

·accuracy rating：0.2class displacer level transmitter

·load resistance：(Power supply -12V)/0.02A

·LED display：Five digits can be configured to %，mA or other physical unit

·Medium boundary density difference：≥0.08g/cm3

·Torque tube material：standard configuration Inconel600，or Monel、HasetlloyC-276

·chamber material: carbon steel、304、316L or as customers’ request

·displacer material：304、316L or as customers’ request

·Flange standard：HG/T20592-2009、HG/T20615-2009 or as customers’ request

·cable entry：Two NPT1/2(internal thread) or as customers’ request

·explosion-proof：Intrinsically safe ExiaⅡCT4

·protection class：IP66

244LD Intelligent Displacer Level (Interface) Transmitter

displacer level transmitter

Model Selection Table

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244LD Intelligent Displacer Level (Interface) Transmitter

244LD Intelligent Displacer Level (Interface) Transmitter

2 The Installation orientation of smart level controller 

Assemble the intelligent level controller to measuring chamber of displacer. Right type of installation is Controller installed on right of the displacer, torque tube rotates clockwise when liquid level rises. Left type of installation is Controller installed on the left of the displacer, torque tube rotates clockwise when liquid level rises.

3 Material and temperature