Flow Transmitter

The XMT868 combines flow measurement capability with a transmitter package that measures 8.2 x 6.6 inches, weighs 10 lb, and can be installed at the process measurement point. The all-digital device provides long-term, drift-free operation. An on-board microprocessor provides exclusive digital signal coding and correlation detection routines, automatic adjustment to changing fluid properties, dynamically configured operating software to simplify programming, and built-in energy flow measurement (with optional RTDs and input board).

The transmitter is provided with two built-in measurement modes, Transit-Time and TransFlection, enabling it to measure flow in applications ranging from ultrapure liquids to extremely attenuating gas-liquid-solid mixtures. An optional second channel provides the capability to measure flow in two separate pipes or at two points on the same pipe. The transmitter can be used with any of the company's ultrasonic transducers, including wetted transducers for maximum accuracy and clamp-on transducers for maximum convenience and flexibility.

The transmitter measures flow rate from –40 to 40 ft/s (–12.2 to 12.2 m/s) and provides a typical accuracy better than 1% of reading with ±0.2% repeatability using wetted transducers, and 2% of reading with ±0.5% repeatability using clamp-on transducers. It is powered by 100/120 or 220/240 VAC (12 or 24 VDC is optional) and consumes 12 watts of power and housed in a weatherproof/explosionproof enclosure suitable for Class I, Division 1 areas. The device is provided with a hand-held RCCU (Remote Control and Communication Unit) that communicates with the XMT868 via an infrared link and allows remote programming and display of flow and diagnostic data. Also supplied are dual, isolated analog outputs (0/4-20 mA) and an RS232 serial output (RS485 is optional). When used with optional IDM PC-based software, the serial output provides the ability to completely configure and operate the transmitter from a PC menu-based interface.

It is ideal for use in water and wastewater management; sewage treatment; semiconductor manufacturing; hydroelectric, fossil fuel, and nuclear power; pulp and paper; and energy measurement. Measurement is noncontaminating, obstructionless, and causes no pressure drop.

Panametrics, Inc., 221 Crescent Street, Waltham, MA 02453. Tel: 781-899-2719; Fax: 781-894-8582.