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Lumenite® Control Technology, Inc.

Capacitance Level Transmitters

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Made In The U.S.A. Since 1937

This is a picture of the front of our Continuous Level Transmitter catalog.

What Is A Capacitance Level Control . . .

        The series 4220 microprocessor based continuous level

transmitter operates on the capacitance principle of level

measurement.  In the simplest terms,  the output signal in

milliamps is dependent on the formula : Dielectric Constant * Area

of Parallel Plates ÷ Distance Between Parallel Plates 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 and the dielectric constant

increases,  the probe diameter and length increases and the

distance from the probe to tank wall (ground probe or tube),


About Continuous Capacitance

Level Transmitters . . .

        MLST and MLXT - 4220 Capacitance Level Transmitters are

for sanitary and industrial level transmitter applications.  They

provide a continuous 4-20mA,  20-amA,  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

and moist granular solids.


        MLST and MLXT-TEMP-4220’s are 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.

MLST/MLXT Level Transmitter Standard Specifications . . .

• 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 160˚F

• 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 402-mA

   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

SP2 and SP4 are relay board that accept a 4-20mA signle and can be used with the 4220 series to turn loads on and off.

We also offer optional accessories

such as relay boards, (on/off switching),  304 s.s. / polycarbonate housings for remote mounted electronics,  28VDC loop power supplies  and LCD backlit meters.

Digital meter mounted in a Nema 4x SWP 304 stainless steel water proof enclosure

Lumenite® Control Technology, Inc.

2331 N 17th Ave.  Franklin Park,  IL 60131

Phone : 1-847-455-1450

E-Mail :

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