Chapter 8. Servicing the PT878

8.5Programming the Thickness Gauge (cont.)

4.The signal inversion prompt enables you to invert the thickness transducer signal. Signal inversion may be necessary if your thickness readings show unusual jitter, or for certain unusual combinations of pipe and fluid or pipe and lining. Consult the factory before measuring the thickness of lined pipes.

Note: When measuring the thickness of certain pipe materials, you might need to drain the pipe before measuring the pipe wall, because certain pipe/liquid combinations muffle the ultrasonic echo.

Signal inversion should be on, unless you have received other instructions. To change its status, use the [W] and [X] arrow keys to move to the appropriate radio button and press [ENTER].

5.To enter the noise threshold:

a.Press [ENTER] to open the text box.

b.Use the numeric keys to enter the desired value.

c.Press [ENTER] to confirm your entry.

6.The final value, the detection threshold, represents the percent of peak the PT878 uses to make measurements. It will consider anything above the entered percentage as part of the signal. To change this value:

a.Press [ENTER] to open the text box.

b.Use the numeric keys to enter the desired value.

c.Press [ENTER] to confirm your entry.

You have finished entering values for the Programming window. To leave this window:

Press the [W] arrow key to move to the Materials tab.

Press [F2] (Cancel) to return to Operate Mode without confirming the changes. The PT878 returns to Operate Mode.

Press [F3] (OK) to confirm the new data and return to Operate Mode. The PT878 returns to Operate Mode.

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Transport® Model PT878 Portable Liquid Flowmeter User’s Manual

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GE PT878 user manual Programming the Thickness Gauge

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.