Chapter 9. Diagnostics and Troubleshooting

9.2 Displaying Diagnostic Parameters

As part of its measurement menu, the PT878 offers a list of diagnostic parameters to aid in troubleshooting in the event of flowcell, transducer, or electrical problems. You can select any diagnostic parameter for display as a measurement as discussed in Chapter 5, Displaying and Configuring Data, on page 95. Table 8 below shows all the available diagnostic parameters and ranges.

Table 8: Diagnostic Parameters

Diagnostic

 

 

 

Parameter

Displays

Good

Bad

 

 

 

 

DT

Displays Delta T, or the difference between

N/A

Continuous

 

the upstream and downstream transit

 

large fluctu-

 

times.

 

ations of 1

 

 

 

ms or more.

 

 

 

 

Amplitude

Displays the value for the amplitude dis-

20-28

<20 or >28

Up

criminator of the upstream transducer.

 

 

 

 

 

 

Amplitude

Displays the value for the amplitude dis-

20-28

< 20 or > 28

Down

criminator of the downstream transducer.

fluctuations

fluctuations

 

 

 

 

T Up

Displays the upstream transit time of the

N/A

N/A

 

ultrasonic signal in micro seconds.

 

 

 

 

 

 

T Down

Displays the downstream transit time of

N/A

N/A

 

the ultrasonic signal in micro seconds.

 

 

 

 

 

 

Gain/Up

Displays upstream gain in dB.

N/A

N/A

 

 

 

 

Gain/Dn

Displays downstream gain in dB.

N/A

N/A

 

 

 

 

Soundspeed

Displays the measured soundspeed of the

Check the soundspeed of

(m/s or f/s)

fluid.

fluid in Soundspeeds and

 

 

Pipe Size Data.

 

 

 

 

P#up

Displays signal peaks for the upstream

100-900

<100, >900

 

transducer.

 

 

 

 

 

 

P#dn

Displays signal peaks for the downstream

100-900

<100, >900

 

transducer.

 

 

 

 

 

 

Reynolds #

Displays the Reynolds Number.

N/A

N/A

 

 

 

 

K(RE)

Displays the K Factor, based on the

N/A

N/A

 

Reynolds Number.

 

 

 

 

 

 

Raw Up

Displays raw upstream signal.

N/A

N/A

 

 

 

 

Raw Down

Displays raw downstream signal.

N/A

N/A

 

 

 

 

206

Transport® Model PT878 Portable Liquid Flowmeter User’s Manual

Page 221 Page 223
Page 222
Image 222
GE PT878 user manual Diagnostic Parameters
Page 221 Page 223

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.
Top Page Image Contents