Chapter 8. Servicing the PT878

8.9Setting Error Limits (cont.)

d.Press the [X] arrow key to move to the maximum signal box, and repeat steps a, b and c.

e.Press the [W] arrow key to return to the minimum signal box, and the [T] key to move to the next limit.

2.The next prompt calls for the low and high velocity limits. The E3: VELOCITY RANGE error message appears if the velocity falls outside these limits. Repeat Step 1 on page 184 to enter the desired limits.

3.The third prompt calls for the low and high limits for the amplitude discriminator. The discriminator measures the size of the transducer signal sent from the PT878. If the signal falls outside these limits, the E5: AMPLITUDE ERROR message appears. Repeat Step 1 on page 184 to enter the desired limits.

4.The fourth prompt asks for the acceptable limits for the soundspeed, based on conditions in your particular system. The E2: SOUNDSPEED ERROR message appears if the fluid soundspeed exceeds that entered in the Pipe option of the Program menu by more than this percentage. The default value is 20% of the nominal soundspeed.

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

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

c.Press [ENTER] to confirm your entry.

5.The final prompt asks for the acceleration limit for detecting cycle skipping. The E6: ACCELERATION ERROR message appears if the velocity changes by more than this limit from one reading to the next.

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

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

c.Press [ENTER] to confirm your entry.

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GE PT878 user manual Setting Error Limits

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.