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3. Couplants
An ultrasonic couplant is supplied for your C-RS installation. The purpose of the couplant is to provide reliable
transmission of ultrasound between two adjacent solid surfaces. Generally speaking, couplants perform this task by
excluding air from between the adjacent surfaces. Accordingly, the C-RS transducers should be pressed tightly against
the pipe, using hand pressure on the set screw to squeeze the couplant to as thin a film as practical for the given pipe
surface.
The most commonly used couplants in ultrasonic testing are ordinarily satisfactory for any short-term clamp-on
flowmeter application. These couplants include, in general order of preference: gels, grease, propylene glycol, oil,
glycerine, and water. Long-term couplants include grease, epoxy adhesive, and solid rubber-like sheet couplant.
The factory provides couplants for both permanent and temporary use as well as for high- and low-temperature
applications. For long-term installations, make sure the couplant does not dry or run out.
Standard couplants supplied by GE are listed in Table 1.
PART NO.
CPL-1
CPL-2
CPL-3
CPL-4
CPL-7
CPL-8
* Installations involving hotter or colder temperatures than listed above, may require special
couplants. Consult the factory for such applications.
4. Preparing for Installation
Before the clamping fixture and transducers can be properly installed, you must do the following:
•
Choose an installation location
•
Prepare the pipe
•
Obtain the transducer spacing
•
Determine the number of traverses
CAUTION!
A flowmeter's accuracy and performance depends on the location, spacing, and alignment of
the transducers. The transducer spacing is unique to your installation.
2
TYPE
Standard
High/Low Temperature
For Portable
Special
Epoxy
Solid Sheet
Table 1: Couplants
TEMP. RANGE
o
o
-40 to 149
F (-40 to +65
o
-256 to 500
F (-160 to +260
o
o
-4 to 140
F (-20 to +60
C)
As Required
o
o
14 to 122
F (-10 to +50
o
-40 to 446
F (-40 to +230
USE
Semi-Permanent
C)
Semi-Permanent
o
C)
Temporary
*Difficult Applications
Permanent
C)
Permanent
o
C)
C-RS Ultrasonic Flow Transducer Installation Guide
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