RF Capacitance Level Transmitters
4220 level transmitter for food, dairy, chemical, pharmaceuticaland industrial applications. Provides a 4-20mA, 20-4mA, 1-5VDC or5-1VDC continuous signal. Works in conductive and non-conductiveliquids and granular solids. Customizable tank connection can befitted with an industrial XP or nema 4x enclosure.
How RF Capacitance Level Measurement Works
"The Capacitance Principal" of level measurement says the output signal in milliamps is dependent on the formula:
C = KA / D
Capacitance (C) = Dielectric Constant (K) × Area of Parallel Plates (A) ÷ Distance Between Parallel Plates (D)
In a level measurement application, the dielectric constant "K" is a value greater than 1. 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 decreases.
4220 RF Capacitance Level Transmitter
Lumenite® 4220 Transmitters provide a continuous 4-20mA, 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 — 4220
- 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 caused by conductive coatings on the sensing probe
YOUR TRANSMITTER MADE TO YOUR SPECIFICATIONS!
Top 10 Things To Think About
- 1.What Is Your Liquid?
- 2.What Are Your Tank Dimensions?
- 3.Do You Have 24VDC Available?
- 4.Will You Need On/Off Switching At Any Point(s) On The Probe?
- 5.What (if Any) Devices Will You Be Turning On/Off?
- 6.What Tank Connection Will You Need?
- 7.Is The Tank Made Of Metal Or Some Other Material?
- 8.Is This A Volital/Industrial Environment Requiring An XP Housing Or A Sanitary Environment Requiring A 304 S.S. Housing?
- 9.Should We Plan On A Digital Display, Relay Board And 24VDC Power Supply Combo?
- 10.Are You Ready To Build Your Level Transmitter?
MLST & MLXT — Combination Level + Temperature
Combination Level And Temperature Transmitters geared for both sanitary and industrial applications. Provides 2 separate 4-20mA outputs, measuring level and temperature with a single probe and one tank connection. Temperature ranges from -100˚ to 1,000˚F.
Model LDM-4-LSP-2 Universal Digital Meter
Universal Meter Accepts Current, Voltage, TC and RTD Inputs
- 4 digit display, 0.56" (14mm) or 1.20" (31mm)
- Linear or square root with low-flow cutoff
- Operating temperature range: -40˚F to 149˚F (-40˚C to 65˚C)
- Maximum / Minimum display
- Type 4x, NEMA 4x, IP65 front
- Universal power supply 85–265VAC
- 4VDC transmitter power supply options
- Free Modbus® RTU protocol
- Copy meter settings to other meters
- Free meterview software – configuration & data acquisition
- USB, RS-232 & RS-485 serial communication adapter options
Frequently Asked Questions — RF Capacitance Level Transmitters
What liquids can the Lumenite 4220 capacitance level transmitter measure?
The 4220 works with conductive and non-conductive liquids as well as moist granular solids — including water, dairy products, chemicals, oils, and food-grade liquids. Its Cancel Coat™ circuitry prevents false readings caused by conductive coatings on the probe.
What output signal does the 4220 RF capacitance transmitter provide?
The 4220 provides a continuous 4-20mA, 1-5VDC, or 5-1VDC analog output proportional to the material level in any shaped tank, making it compatible with virtually all PLCs, DCS systems, and digital panel meters.
How accurate is the Lumenite 4220 level transmitter?
The 4220 delivers accuracy and repeatability better than 0.1% of span, with resolution exceeding 1 part in 10,000 and linearity better than 0.003% over an industrial temperature range of -20°F to 160°F.
Can I get a combination level and temperature transmitter?
Yes. The Lumenite MLST and MLXT are combination level and temperature transmitters that provide two separate 4-20mA outputs from a single probe and single tank connection. Temperature measurement ranges from -100°F to 1,000°F.
Are Lumenite capacitance level transmitters made in the USA?
Yes. All Lumenite® transmitters have been designed and manufactured in the USA since 1934.
Video: 4220 RF Capacitance Level Transmitter