SENSORS: Innovative Solutions‘ TR420E is a top-mounted, 316 stainless-steel level sensor containing a chain of equally spaced reed switches and resistors. When activated by the vertically moving magnetic float, the variable resistive signal is converted to a proportional voltage or (4-20 mA) current output through the 12 or 24V dc powered conditioning board located in the top-mounted, Nema 7 J-box. Available in lengths up to 18 ft, the TR420E features a standard ½-inch repeating increments with optional ¼-inch resolution, and can be supplied in a variety of mount sizes and enclosure styles. The various output options are compatible with most programmable controllers and digital receivers.
It carries an FM explosion-proof rating for Class I, Division 1, Groups A,B,C and D; and dust-ignition proof for Class II/III, Division 1, Groups E, F and G hazardous, (classified) locations, indoor/outdoor (Type 4, 4X).
Unlike many solid-state level transmitters, the TR420E float transmitter is unaffected by the conductivity or dielectric properties of the liquid. The staggered reed switch and parallel resistor arrangement also ensure a continuous and accurate signal. If one reed switch were to fail, the resulting signal would be affected only at that point. The integral circuit board design, robust stainless-steel tube and high-pressure float resist high levels of shock and vibration make the TR420E ideal for off-road vehicle fuel tanks, generator set fuel tanks and other combustible liquid storage.
-Edited by Kelsey Anderson