Appendix C. Temperature Transmitter Installation

The PT878 requires a supply and return temperature input to measure energy rate and consumption. You must connect the temperature sensors to a 4 to 20 mA transmitter (powered by the PT878 or externally) and then from the transmitter to the PT878 (a special GE cable is required to make transmitter-to-PT878 connections).

The factory can supply the Resistive Temperature Device (RTD) and a Dual Transmitter (DTR) or you may supply your own. If you supply your own equipment, you will need to order a special GE cable with a LEMO connector to make connections from the transmitter to the PT878.

To install the RTDs, you need to do the following:

•find a suitable installation site

•mount RTDs on the pipe

•make electrical connections

Use the instructions that follow to install the RTDs.

C.1 Guidelines for RTD Installation

You should have discussed possible installation sites with an applications engineer or field sales person by the time you receive the RTDs. However, you should follow these guidelines to ensure accurate temperature measurement:

•Do not install the RTD on a pipe seam.

•Clean the pipe at the installation location.

•Do not install the RTD on the top or the bottom of the pipe.

•Apply thermal couplant to the RTD before mounting it to the pipe.

•Insulate the pipe and RTD after installation.

If you have a GE RTD, use the instructions in the next section to properly mount the RTD on the pipe.

Transport® Model PT878 Portable Liquid Flowmeter User’s Manual

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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.

GE PT878 Appendix C. Temperature Transmitter Installation, Guidelines for RTD Installation

Models: PT878