Appendix G. Glossary

Impulse Response — Option in the Service Menu that enables you to force the meter to transmit in one direction only, without changing the amplifier gain setting.

Locale — Format for displaying the time and date.

Peak Detection — A method for identifying the ultrasonic signature in the received signal. In the “Peak” method, the peak is identified by testing a derivative of the signal. In the “Threshold” method, the peak is identified as the point where the signal crosses a threshold that is a percentage of the maximum signal detected.

Receive Window — A window of time during which the PT878 tries to detect the ultrasonic signal. It is determined by using the fluid soundspeed and the signal path length to estimate when the signal will arrive at the receiving transducer.

Reynolds Correction — Correction factor based on the Kinematic Viscosity and flow rate of the fluid.

Signal Inversion — Option that enables a thickness gauge user to invert the transducer signal.

Signal Path — Path the ultrasonic signal travels from one transducer to the other.

Simulate — Option in the Service Menu that allows users to simulate measurements based on a waveform stored in the PT878.

Site — A location on a pipe where measurements are made. The site includes the transducers, pipe, fluid type, pipe material and other parameters.

Site File — Instrument program that combines all the necessary parameters (transducer, pipe, fluid, etc.) for a particular measurement location.

Snapshot — Option in the Meter Menu to take screen captures in bitmap format of a given screen display.

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GE PT878 user manual Appendix G. Glossary

PT878 specifications

The GE PT878 is a state-of-the-art portable ultrasonic flow meter designed for the precise measurement of liquid flow in various applications. As part of General Electric’s renowned instrumentation lineup, the PT878 combines innovative technology with user-friendly features, making it an invaluable tool for engineers, technicians, and plant operators.

One of the standout characteristics of the PT878 is its non-invasive measurement capability. The meter utilizes clamp-on transducer technology, allowing it to be installed on the exterior of the pipe, eliminating the need for invasive procedures which can disrupt the system or require pipe cutting. This non-contact approach not only simplifies installation but also enhances the device’s versatility, as it can be applied to a wide range of pipe sizes and materials.

The PT878 leverages advanced digital signal processing and sophisticated algorithms to provide accurate and reliable flow measurements. It operates using the time-of-flight method, whereby ultrasonic signals are sent and received through the fluid in the pipeline to determine the flow rate. This technology allows for remarkable precision, ensuring that operational efficiency can be maintained.

Moreover, the PT878 is equipped with features such as a bright, easy-to-read display, intuitive navigation, and robustness against harsh environmental conditions. Its compact and lightweight design enhances portability, making it suitable for field applications. The meter operates on battery power, providing a long-lasting solution for remote monitoring and temporary installations.

Another impressive aspect of the PT878 is its ability to measure not only water but also a variety of liquids, from hydrocarbons to chemicals. It supports multiple measurement modes, including volumetric flow and velocity, offering a level of flexibility that caters to diverse industrial needs.

In addition to flow measurement, the PT878 offers data logging capabilities, allowing users to store and analyze flow data over time. This function is vital for understanding trends, diagnosing issues, and optimizing system performance. Users can easily transfer data to computers for comprehensive analysis, enhancing operational insights.

With its combination of innovative technology, user-friendliness, and robust measurements, the GE PT878 ultrasonic flow meter stands out as a comprehensive solution for industries requiring reliable liquid flow measurement. Whether in a manufacturing plant, a water treatment facility, or any application requiring fluid monitoring, the PT878 delivers exceptional performance and accuracy.