Open Channel Ultrasonic Flowmeters Sample Clauses

Open Channel Ultrasonic Flowmeters. Each ultrasonic flowmeter shall be a microprocessor-based electronic unit consisting of a sensor assembly, a signal converter/transmitter, and an interconnecting cable. The sensor shall be encapsulated in a chemical and corrosion-resistant material such as kynar or CPVC, and shall be suitable for operation over a temperature range of –20 to ? 150?F, with a relative humidity of 10 to 100 percent. Sensors shall be compatible with the process media being measured. The sensor shall be mounted directly over the flume and shall measure the fluid level by means of reflected high frequency sound waves. Sensors mounted in areas subject to freezing condensation shall be protected against icing with special transducers or heaters. Sensors mounted in direct sunlight shall be provided with sunshades. The supplier shall coordinate the sensor mounting requirements and shall furnish drawings, complete with dimensions and elevations, to ensure a proper and satisfactory installation. The ultrasonic flowmeter shall have automatic compensation for changes in air temperature at the sensor location. If separate temperature sensing probes are provided, they shall be mounted with or adjacent to the ultrasonic sensor, as recommended by the manufacturer. The transmitter shall have a Four-digit LCD display scaled to read in engineering units of flow. Digit height shall be approximately 0.5 inch. The transmitter shall be designed to ignore momentary level spikes, false targets, or momentary loss-of echo. A loss-of-echo condition shall be indicated on the transmitter unit and shall be available as an alarm contact output. The transmitter output shall be an isolated 4-20 mA dc signal linearly proportional to flow. The signal converter shall use a microprocessor- based digital flow linearizer circuit that can be easily changed in the field. Accuracy of the transmitted signal shall be + 1.0 percent of flow range. A sufficient length of sensor-to-transmitter signal cable shall be furnished with the instrument to locate the sensor 25 to 200 feet from the signal converter. The signal converter electronics shall be housed in a weatherproof, corrosion- resistant NEMA Type 4 enclosure suitable for wall or pipestand mounting and for operating temperatures of –15 to 125?F and a relative humidity of 10 to 100 percent. A thermostatically controlled strip heater shall be provided in the signal converter enclosure. The signal converter shall be of the ac power type. The ultrasonic flow transmitter s...
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