GE General Electric Oxygen Equipment PT878 Benutzerhandbuch

Appendix C. Temperature Transmitter Installation

Transport® Model PT878 Portable Liquid Flowmeter User’s Manual

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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.

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.