DRUCK AT868超声波变送器英文说明书.doc

GE Measurement Control AquaTrans? AT868 Panametrics Liquid Flow Ultrasonic Transmitter Features Applications ? Economical non-intrusive ?ow measurement ? Simple setup and installation The AquaTrans AT868 liquid ?ow transmitter is a complete ultrasonic ?ow metering system for measurement of: ? Potable water ? Wastewater ? Suitable for wide range of pipe sizes and materials ? Suitable for lined pipes ? Sewage ? Two-channel/two-path version available ? Velocity, volumetric and totalized ?ow ? Internal keypad for ?eld programming ? Discharge water ? Treated water ? Cooling and heating water ? Other liquids  Liquid Flow Ultrasonic Transmitter Wetted or Clamp-On Transducers The AquaTrans AT868 liquid ?ow ultrasonic transmitter combines state-of-the-art ?ow measurement capability with a low-cost transmitter package that can be installed right at the process measurement point. It’s designed speci?cally for water and wastewater applications in full pipes. The all-digital AquaTrans AT868 has no moving parts and requires minimal maintenance. An onboard microprocessor uses patented Correlation Transit- Time? technology for long-term, drift-free operation. Automatic adjustment to changing ?uid properties and dynamically con?gured operating software simplify programming. Ultrasonic ?ow transducers are classi?ed as either wetted or non-wetted (clamp-on). Clamp-on transducers are clamped onto the outside of the pipe and never come into contact with the process ?uid. Wetted transducers are mounted into the pipe or ?owcell in direct contact with the process ?uid. Clamp-on transducers o?er maximum convenience, ?exibility and a low installation cost compared to traditional ?ow metering technologies. With proper installation, wetted transducers provide maximum accuracy (better than 1% of reading) in most applications. Transit-Time Flow Measurement Technique Two-Channel Model The transit-time technique uses a pair of transducers with each transducer sending and receiving coded ultra