SSI Technologies - Application Note DT-AN8 TM Digital Fluid Trac (DFT-220) Multi-Unit Drum Gauge With 4-20mA Electrical Output, 2 NPT or NPS Product Features Multiple Selectable Units: 15, 30, 55 gallons or 57, 114, 208 liters Low Level Warning Display Resolution: +/- 0.5 gallon or +/- 1 liter* 4-20 mA output accuracy: +/-2.5% of current output span* Two Modes of Level Measurement: o External 24Vdc Supply - Continuous level monitoring display and 4-20mA current output o Stand Alone two 9-Volt batteries user initiated level monitoring display NEMA 4 Packaging Press and release Refresh/Select to Low Level Warning Light: A red LED will flash update the level once every second when the volume is at 10% or reading and select below the maximum volume. display units Easy to install: Digital Fluid-Trac DFT-220 has no components to protrude into the drum. Product Description Standard: Fits 2 NPT opening or NPS opening Digital Fluid-Trac Model DFT-220 multi-unit drum gauge is a cost competitive non-contact liquid level drum gauge with Dead Band: 6 from top of barrel when using the 4-20 mA output. The unit has 2.5% accuracy over its output optional adaptor range. More Reliable: No components to chemically The DFT-220 drum gauge was designed for usage on corrode inside liquid media. standard ANSI MH2-2004 vertical drums ( 32 inch depths). The DFT-220 drum gauge allows the user to easily select Chemical compatibility: Digital Fluid-Trac between the following vertical drum settings: DFT-220 drum gauge works with a wide variety of media such as water, waste water, motor oil, 15 gallon hydraulic fluid and diesel fuel. 30 gallon * Outside of stated dead band. 55 gallon The Digital Fluid-Trac DFT-220 drum level gauge is NOT intended for use with gasoline or other volatile liquids that 57 liter produce a vapor pressure under normal operating 114 liter temperature (0C - 50C). 208 liter th SSI TECHNOLOGIES, INC. Copyright August 12 2016 Controls Technologies Division SSI Technologies, Inc. 3200 Palmer Dr. All Rights Reserved Janesville, WI 53547-5011 Revision 2 Phone: (608)757-2000 www.ssitechnologies.com Page 1 SSI Technologies - Application Note DT-AN8 TM Digital Fluid Trac (DFT-220) Multi-Unit Drum Gauge With 4-20mA Electrical Output, 2 NPT or NPS Measurement Technology Electrical Interface The Digital Fluid-Trac DFT-220 drum level gauge The Digital Fluid-Trac DFT-220 drum gauge can be uses ultrasonic technology to generate a high- powered by either 24Vdc external power supply or by frequency sound wave and measures the time for the 2 9-Volt batteries. echo to reflect off the target fluids surface and return. The distance from the Digital Fluid-Tracs sensor to the The 4-20 mA electrical output can be interfaced to liquid is calculated based on the speed of sound. external controllers and test equipment. Refer to the figure and table below for harness connections. The Digital Fluid-Trac DFT-220 has a LCD which displays the liquid level pictorially as well as in gallon (or liter) units. 2 1 When externally powered by 24Vdc, the DFT- 200 will continuously monitor the drums liquid level and 3 4 report the level readings in two forms LCD digital display and 4-20 mA current output. The 4-20 mA electrical output can be used to interface to external Figure 1 DFT-220 Connector controllers and test equipment. When powered using two 9-volt batteries momentarily depressing the Refresh/Select button will initiate a Table 1 DFT-220 Interface Harness level measurement. This measurement is then displayed for 5 minutes then the DFT-210 goes into Pin Number Harness Color Interface Signal battery power saver mode and shuts off. 1 White DC Power (18-26Vdc) 2 Black Ground Note: The 4-20mA output does not function when the unit is operating on the 9V batteries. 3 Blue No Connection 4 Brown 4-20 mA Output Note: The Refresh/Select button has to be depressed again to come out of the battery power saver mode. A low-level warning light (red LED located on the bottom left of the LCD display), will flash once every second when the liquid level is <= 10% the maximum volume. th SSI TECHNOLOGIES, INC. Copyright August 12 2016 Controls Technologies Division SSI Technologies, Inc. 3200 Palmer Dr. All Rights Reserved Janesville, WI 53547-5011 Revision 2 Phone: (608)757-2000 www.ssitechnologies.com Page 2