GE C-PT, Руководство по установке

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C-PT Ultrasonic Flow Transducer Installation Guide 1
1. Introduction
The C-PT ultrasonic flow transducer is used exclusively with the GE line of ultrasonic flowmeters. These transducers
measure the flow rate of sonically-conductive liquids through pipes having diameters between 2 in. (5 cm) and over
300 in. (760 cm). Such measurements are typically independent of the pipe material.
This document provides the following instructions on installing and maintaining C-PT transducers:
•
Transducer Construction - below
•
Measurement Methods - page 2
•
Couplants - page 3
•
Installing Transducers for the Transit-Time Method - page 4
•
Installing Transducers for the TransFlection Method - page 40
•
Maintaining Transducers - page 50
•
Specifications - page 51
2. Transducer Construction
Each C-PT transducer assembly consists of the following components (see Figure 1 on page 2):
•
a metallic cover with 1/2” NPT male thread for attaching a junction box
•
a transducer that consists of a peizo electric element mounted on a wedge and wired to the BNC connector
•
a BNC style connector for use in connecting the transducer to the flowmeter.
The internal cavity of the assembly, including the transducer cover and the transducer head, is filled with a damping
compound. The C-PT is available in the following process temperature ranges:
•
Normal: -4 to 122
o
F (-20 to 50
o
C)
•
Medium: -4 to 293
o
F (-20 to 145
o
C)
•
High: -4 to 363
o
F (-20 to 184
o
C)*
*This temperature is for ATEX certified designs. Consult factory for higher temperatures.
IMPORTANT:
Transducer assembly C-PT-H must be mounted in such a way that it is protected against impact.