Modbus STI

This display meter works with the Level Plus MG transmitter via a Modbus interface to monitor the product, interface and temperature all from a single process opening. With a direct connection, the Modbus protocol provides volume measurement with a strapping table (up to 100 points) and temperature correction according to API standards. Developed as a side-tank indicator (STI) for storage tanks, it can display tank levels in feet and inches, to sixteenths of an inch. The transmitter features plug-and-play installation, and users can choose to have the meter display product only, product and temperature, or product, interface and temperature. The Modbus STI includes two relays (2 A at 250 SPDT), a 4–20-mA output, 120/240-VAC input power, 24-VDC to the gage, and an optional explosionproof housing. Suitable for process control, bulk storage, precision inventory control and product level, interface level and temperature monitoring, the transmitter features surface-mount technology and a high-speed signal-processing integrated circuit. The microprocessor firmware has a flexible command interface, high noise-rejection capability, built-in test functions, and automatic data-error checking. Serial asynchronous data formats (Modbus and MTS DDA) provide a direct interface to most types of computers and digital communication equipment.