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Lumenite® Control Technology Inc
Lumenite® Control Technology Inc
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  • Home
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  • Temperature Transmitters
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Continuous RF Capacitance

Level Transmitters

        4220 microprocessor based level transmitters operate on the capacitance principle providing a continuous level measurement output.

Watch The Hands On Help 4220 Setup Video

How Do Capacitance Level Transmitters Work . . .

Capacitance Formula

What Is Capacitance?

Capacitance is expressed as the ratio of the electric charge on each conductor to the potential difference (i.e., voltage) between them.


Diagram of how capacitance is used for continuous level measurement or continuous level transmitters

With level transmitters,  the output signal in milliamps is dependent on the capacitance formula :


Dielectric Constant  x Area of Parallel Plates ÷ Distance Between Parallel Plates or C = KA / D


where the dielectric constant “K” is a value greater than 1.  The value “A” is dependent on the diameter and length of 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.

Lumenite® Level Transmitters

MLST-4220-C2" Sanitary RF Capacitance Level Transmitter With 304 s.s. Housing,  304 s.s. 2 Inch Tri-

MLST And MLXT-4220

continuous level transmitters are for sanitary and industrial level transmitter applications.  A capacitance level transmitter provides 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 continuous level transmitters and 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 Sanitary Models

Conforms to NEMA Type 4,  4x,  12 and 13 waterproof and corrosion resistant.  Constructed with 14 gauge 304 s.s.

MLXT Industrial Models

Conforms to Class I Groups C & D,  Class II Groups E,  F,  & G and Class III suitable for wet locations.  Applicable Standards : Nema 7,  9 and 4x.

Common Features

Applies To Both Sanitary And Industrial Models

 • Resolution to better than 1 part in 10,000

• Accuracy and repeatability to less than 0.1% of span

• Microprocessor based capacitance level transmitters 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 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 continuous

  level controls sensing probe

Level Transmitter With 3/4 Inch 304 s.s. NPT Connection,  XP Industrial Housing

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Hands On Help Series Video #01 : 4220 Setup

In this video you will learn how to calibrate the 4-20mA set points and set the low and high based on the level of liquid in your tank.

DOWNLOAD THE CATALOG OF THIS PRODUCT

MLST MLXT 4220 Catalog (pdf)Download

Approved & Certified : UL, CSA & 3A

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Contact Us - Level Transmitters

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Lumenite® Control Technology, Inc.

2331 17th Avenue, Franklin Park, Illinois 60131, United States

Main : 1(847) 455-1450 Fax : 1-847-455-0127 Outside U.S.A. : 0011-847-455-1450 General E-Mail : customerservice@lumenite.com Technical Support : technicalsupport@lumenite.com 24/7 Technical Text Support : 1-630-721-3319

Hours Of Operation / CT

Open today

08:00 am – 04:00 pm

  • Home
  • Product Page
  • Level Controls
  • Level Transmitters
  • Timing Controls
  • Octal Socket Conductivity
  • Din-Rail Conductivity
  • Snap Track Conductivity
  • Stand Alone Level Control
  • Pressure Measurement
  • Sanitary Analog Gauges
  • Sanitary Digital Gauges
  • Pressure Transmitters
  • Temperature Transmitters
  • HTST Test Systems
  • Probes And Jacks
  • Single Industrial Probes
  • Multi Level Indust Probes
  • Sanitary Probes
  • Digital Meter
  • Shop Lumenite

Lumenite® Control Technology, Inc.

2331 N 17th Ave.Franklin Park, IL 60131 USA

(847) 455-1450

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