Lumenite® Control Technology, Inc.

Applying The Math To Level Control . . .

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.

Continuous Level Transmitters + Temperature!

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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Lumenite® Control Technology, Inc.

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

Phone : 1-847- 455-1450 E-Mail : customerservice@lumenite.com

Hours Of Operation

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08:30 am – 05:00 pm

Continuous RF Capacitance

Level Transmitters

The Math Behind It . . .

Applying The Math To Level Control . . .

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