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Continuous Capacitance

Level Transmitter

                                  MLST and MLXT 4220

                                  Capacitance Level

                                  Transmitters  are for

                                  sanitary and industrial

                                  applications.  They

                                  provide a continuous

                                  4-20mA,  20amA, 1-5VDC or 5-1VDC analog output

proportional to the material level in any

shaped tank.  They can be used for

conductive,  non-conductive liquids & moist

granular solids. 

        "The Capacitance Principal" of level

measurement says the output signal in

milliamps is dependent on the formula :

        Capacitance (C) = Dielectric Constant

(K) * Area of Parallel Plates (A) ÷ Distance

Between Parallel Plates (D) or C = KA / D.

        In a level measurement application,

the dielectric constant “K” is a value greater

than 1.  The value “A” is dependent on the

diameter and length the level probe.  The

value “D” is the distance from the probe to

the tank wall,  ground reference probe or

concentric tube.  Consequently, capacitance

(C) and the resultant mA output increases

as the dielectric constant increases,  the

probe diameter and length increases, and

the distance from the probe to tank wall

(ground probe or tube),  decreases.

        MLST and MLXT TEMP 4220’s are

Lumenite®’s combination level /

temperature transmitters for sanitary and

industrial applications.  In addition to having

all of the standard specifications,  they

provide 2 separate 4-20mA outputs

measuring level and temperature with one

probe and one tank connection.

Temperature  ranges from -100˚ to 1,000˚F.

Sanitary & Industrial Connections Available!


• Resolution to better than 1 part in 10,000

• Accuracy and repeatability to less than

  0.1% of span

• Microprocessor based transmitter with on

  board digital to analog conversion assuring

  negligible output current error of 0.003%

• Linearity of better than 0.003% over

  industrial temperature range of -20˚F to


• Designed with most up to date surface

  mount, integrated circuits and components

• Standard range of 0.0001 picofarads to

  15,000 picofarads allowing the 4220 to

  span 4-20mA over 1 inch of water,

  (high sensitivity) or hundreds of feet of

  water (low sensitivity)

• Non interacting zero and span

• Cancel Coat™ circuitry and superior

  resolution eliminate the readout errors

  cause by conductive coatings on the

  sensing probe

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