Chapter 9. Diagnostics and Troubleshooting

Table 7: Error Messages (cont.)

Error

Problem

Possible Cause

Action

 

 

 

 

E3

Velocity Range -

Programming error, poor

Make sure flow rate is within

 

Velocity exceeds

flow conditions, or bad

±12m/s (±40 ft/s). Check

 

programmed limits

transducer spacing.

programming and transducer

 

(Velocity limit is

 

spacing. If programmed value

 

programmed using

 

is outside of limit, change the

 

the Service Menu

 

limits as described in Chapter 8

 

Error Limits option

 

on page 184. See Flowcell Prob-

 

as described in

 

lems on page 208 and Trans-

 

Chapter 8.)

 

ducer Problems on page 210.

 

 

 

 

E4

Signal Quality

If too high - electronic

Check for source of electrical

 

 

failure.

interference. Check electronics

 

 

If too low - flowcell,

with a test flowcell. If unit still

 

 

electrical problem.

fails to operate, contact the

 

 

 

factory

 

 

 

 

E5

Amplitude Error

Excessive particles or

See Flowcell Problems on

 

 

bubbles present in fluid.

page 208.

 

 

A lot of second phase

 

 

 

present

 

 

 

 

 

E6

Cycle skip,

Poor flow conditions or

Check transducer spacing as

 

Acceleration

bad transducer spacing.

programmed and as set on

 

 

 

pipe. See Flowcell Problems on

 

 

 

page 208 and Transducer

 

 

 

Problems on page 210.

 

 

 

 

E7

Analog Out Error

Under current output.

Check that output load is within

 

 

 

specification <550 ohm.

 

 

 

 

E8

Temperature Input

Supply temperature

Check cable and transmitter.

 

Supply

input out of range.

 

 

 

 

 

E9

Temperature Input

Return temperature

Check cable and transmitter.

 

Return

input out of range.

 

Transport® Model PT878 Portable Liquid Flowmeter User’s Manual

205

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GE PT878 user manual Velocity Range
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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.
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