SSI Technologies - Application Note AT-AN12 Acu-TracŪ Smart 485 Liquid Level Transducers Family Overview
Product Description
The Acu-TracŪ Smart 485 family ultrasonic liquid level
transducers are designed for continuous level monitoring and liquid level control applications. These non-contact continuous level
transducers can monitor tanks or storage containers that have a depth of up to 1.9 meters (75.69 inches) for gasoline and 2.5 meters (98.4 inches) for other media. The Acu-TracŪ Smart 485 ultrasonic
transducers incorporate a RS-485 bus for real time processing of liquid levels in two messaging formats. The Smart 485 liquid level
transducers offers three electrical outputs for level control in the following forms: 4-20 mA Current (12V or 24V input) Ratiometric Voltage 0.5 to 9.0 Volt (12V input) Non-Ratiometric 0.5 to 9.5 Volt (24 Volt input). The Smart 485 liquid level transducer is designed with power up self diagnostics and allows the user flexibility through programmable features: Tank Configuration Profiling Digital Filtering Gauge Drive Output (full and empty endpoints) Communication Mode. Note: An Acu-TracŪ Smart 485 Configuration Kit is required to program the liquid level transducer. Non-Invasive: Acu-TracŪ Smart 485 mounts to the same opening as the resistive float sender, but does not protrude into the tank. Digital Filtering: User programmable time constant in digital filtering eliminates errors due to fluids sloshing in mobile tanks. Tank Profiling: User programmable strapping tables for unique tank shapes. Chemical compatibility: Acu-TracŪ Smart 485 works with a wide variety of media including diesel, gasoline, motor oil, hydraulic fluid, black water, and more. Self Test/Diagnostics: Internal Power Up Test verifies transducer is operating properly.
Product Features
Accuracy: 2 % full scale of tank volume Continuous Real Time Liquid Level Monitoring: Electrical output and RS-485 messaging data. Reliability: Acu-TracŪ Smart 485 liquid level
transducers are non-contacting. Resistive float senders have a wiper that slides across a resistive strip that with time can wear out and cause intermittent or complete loss of the signal. RS-485 Messaging: NEMA 4 Rating Two types of messages programming commands and timed data broadcast messages. (See AT-AN14 for more details)
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