Lumenite® Control Technology, Inc.
Made In The U.S.A. Since 1937
The series 4220 microprocessor based continuous level
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 as the dielectric constant
increases, the probe diameter and length increases, and the
distance from the probe to tank wall (ground probe or tube),
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.
• 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