"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 & MLXT - TEMP - 4220
Combination Level And
Temperature Transmitters are
geared for both sanitary and
industrial applications. In
addition to having all of the
standard specifications, it
provides 2 separate 4-20mA
outputs, measuring level and
temperature with a single
probe and one tank
connection. Temperature
ranges can be 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
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
What Is Capacitance?
MLST & MLXT - 4220
Capacitance Level Transmitters
are for both 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.
Standard Specifications
All In One Meter Accepts Current, Voltage, TC And RTD Inputs!
Model LDM-4-LSP-2 Universal Digital Meter
Process & Temperature Meter Specifications
• 4 digit display, 0.56" (14mm) or 1.20 (31mm)
• Linear or square root with low-flow cutoff
• Operating temperature range of between
-40˚F and 149˚F (-40˚C and 65˚C)
• Maximum / Minimum display
• Type 4x, Nema 4x, IP65 front
- Universal power supply 85-265VAC2
- 4VDC transmitter power supply options
- Free Modbus® RTU protocol
• Copy meter settings to other meters
• Free meterview software - configuration & data aquisition
• USB, RS-232 & RS-485 serial communication adapters options
