Chapter 9. Diagnostics and Troubleshooting

Table 8: Diagnostic Parameters (cont.)

Diagnostic

 

 

 

Parameter

Displays

Good

Bad

 

 

 

 

Xmit Corr

Displays raw upstream signal correlated

N/A

N/A

Up

with transmit signal.

 

 

 

 

 

 

Xmit Corr

Displays raw downstream signal correlated

N/A

N/A

Dn

with transmit signal.

 

 

 

 

 

 

Cross Corr

Displays transmit upstream signal corre-

N/A

N/A

 

lated with transmit downstream signal.

 

 

 

 

 

 

SS up

Displays the signal strength for the

50-80

<50

 

upstream transducer.

 

 

 

 

 

 

SS do

Displays the signal strength for the

50-80

<50

 

downstream transducer.

 

 

 

 

 

 

PEAK%

Displays the Percent of Peak. Set to -40 by

N/A

N/A

 

default. To change see page 182.

 

 

 

 

 

 

Qup

Displays the signal quality for the upstream

±300 or

between

 

transducer.

higher

±100

 

 

 

 

Qdown

Displays the signal quality for the down-

±300 or

between

 

stream transducer.

higher

±100

 

 

 

 

NFup

Displays the normalization factor for the

0.85 - 1.0

<0.85

 

upstream transducer.

 

 

 

 

 

 

NFdn

Displays the normalization factor for the

0.85 - 1.0

<0.85

 

downstream transducer.

 

 

 

 

 

 

TEMPs

Displays the temperature for the supply

N/A

N/A

 

input (energy measurement).

 

 

 

 

 

 

TEMPr

Displays the temperature for the return

N/A

N/A

 

input (energy measurement).

 

 

 

 

 

 

Ts - Tr

Displays the difference between the tem-

N/A

N/A

 

perature for supply input and the tempera-

 

 

 

ture for return input (energy measurement).

 

 

 

 

 

 

DENSs

Displays the density for the supply input.

N/A

N/A

 

(Energy measurement.)

 

 

 

 

 

 

DENSr

Displays the density for the return input.

N/A

N/A

 

(Energy measurement.)

 

 

 

 

 

 

DELTh

Displays the delta enthalpy, or difference

N/A

N/A

 

between the supply and return enthalpy

 

 

 

(enthalpy is a measure of energy contained

 

 

 

in the fluid.) (Energy measurement.)

 

 

 

 

 

 

Transport® Model PT878 Portable Liquid Flowmeter User’s Manual

207

Page 223
Image 223
GE PT878 user manual Displays raw upstream signal correlated With transmit signal

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.