GE Sensing C-ET Operating Manual
GE
Measurement & Control
Model C-ET
Ultrasonic Flow Transducer System
Installation Guide
916-083 Rev. A
February 2012
Model C-ET
Ultrasonic Flow Transducer System
Installation Guide
916-083 Rev. A
February 2012
www.ge-mcs.com
©2012 General Electric Company. All rights reserved.
Technical content subject to change without notice.
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ii
Preface
Information Paragraphs
Note paragraphs provide information that provides a deeper understanding of the situation, but is not essential to
•
the proper completion of the instructions.
• Important paragraphs provide information that emphasizes instructions that are essential to proper setup of the
equipment. Failure to follow these instructions carefully may cause unreliable performance.
• Caution! paragraphs provide information that alerts the operator to a hazardous situation that can cause damage to
property or equipment.
• Warning! paragraphs provide information that alerts the operator to a hazardous situation that can cause injury to
personnel. Cautionary information is also included, when applicable.
Safety Issues
WARNING! It is the responsibility of the user to make sure all local, county, state and national codes,
regulations, rules and laws related to safety and safe operating conditions are met for each
installation.
Auxiliary Equipment
Local Safety Standards
The user must make sure that he operates all auxiliary equipment in accordance with local codes, standards,
regulations, or laws applicable to safety.
Working Area
WARNING! Auxiliary equipment may have both manual and automatic modes of operation. As equipment
can move suddenly and without warning, do not enter the work cell of this equipment during
automatic operation, and do not enter the work envelope of this equipment during manual
operation. If you do, serious injury can result.
WARNING! Make sure that power to the auxiliary equipment is turned OFF and locked out before you
perform maintenance procedures on the equipment.
Qualification of Personnel
Make sure that all personnel have manufacturer-approved training applicable to the auxiliary equipment.
Personal Safety Equipment
Make sure that operators and maintenance personnel have all safety equipment applicable to the auxiliary equipment.
Examples include safety glasses, protective headgear, safety shoes, etc.
Unauthorized Operation
Make sure that unauthorized personnel cannot gain access to the operation of the equipment.
C-ET Ultrasonic Flow Transducer System Installation Guide iii
Preface
Environmental Compliance
Waste Electrical and Electronic Equipment (WEEE) Directive
GE Measurement & Control is an active participant in Europe’s Waste Electrical and Electronic Equipment (WEEE)
take-back initiative, directive 2002/96/EC.
The equipment that you bought has required the extraction and use of natural resources for its production. It may
contain hazardous substances that could impact health and the environment.
In order to avoid the dissemination of those substances in our environment and to diminish the pressure on the natural
resources, we encourage you to use the appropriate take-back systems. Those systems will reuse or recycle most of the
materials of your end life equipment in a sound way.
The crossed-out wheeled bin symbol invites you to use those systems.
If you need more information on the collection, reuse and recycling systems, please contact your local or regional
waste administration.
Visit http://www.ge-mcs.com/en/about-us/environmental-health-and-safety/1741-weee-req.html
take-back instructions and more information about this initiative.
for
iv C-ET Ultrasonic Flow Transducer System Installation Guide
Contents
1. Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
2. Transducer Construction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2.1 Solid Sheet Couplants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
3. Installing the C-ET Transducer System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
3.1 Choosing an Installation Location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
3.1a Application Guide - Wall Thickness (in inches) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1b Application Guide - Wall Thickness (in millimeters). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
3.2 Obtaining the Transducer Spacing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
3.2a Determining Special Transducer Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.2b Pipe Survey to Determine OD and Wall Thickness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
3.2c Fluid Soundspeed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
3.3 Installing the V Clamping Fixtures and Transducers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
3.3a Tools and Equipment Needed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
3.3b Setting the Transducer Spacing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
3.3c Installing the Fixture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
3.3d Preparing the Pipe. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
3.3e Mounting the Transducers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
3.4 Installing the PI Fixture and Transducers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
3.4a Tools and Equipment Needed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
3.4b Preparing the Pipe. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
3.4c Surveying the Pipe. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
3.4d Installing the First Mounting Block. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
3.4e Installing the Second Mounting Block. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
3.4f Mounting the Transducers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
4. Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
5. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
CET Ultrasonic Flow Transducer System Installation Guide v
Contents
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vi CET Ultrasonic Flow Transducer System Installation Guide
1. Introduction
BNC Connector
5/8” UNF Thread
3/4” NPT Thread
Holder
Waveguide
The clamp-on extended temperature (C-ET) range transducer system provides liquid flow measurement in very low- or
very high-temperature applications. It represents GE’s latest generation of non-contact, demanding measurement
transducers and capitalizes on more than 20 years of experience from the OKS transducer system.
The C-ET system is designed to isolate the transducer from the extreme process conditions, enabling it to measure high
temperature hydrocarbon liquids, superheated water, heat transfer oils and cryogenic liquids. In addition, the C-ET
system retains all of the characteristics that make ultrasonic technology best for critical process measurements under
harsh conditions.
The C-ET clamp-on ultrasonic flow transducers are used exclusively with the GE line of ultrasonic flowmeters. These
transducers are used to measure the flow of various liquids through pipes having diameters from 3 in. (75 mm) to 24 in.
(600 mm). This document provides details on the following topics:
• Transducer Construction
• Installation
• Maintenance
• Specifications
2. Transducer Construction
The C-ET transducer consists of a C-RS transducer, a waveguide, and a holder pre-assembled from the factory.
The transducer assembly includes a 316 stainless steel housing with a plastic wedge attached and a BNC-type electrical
connector. The transducer features integral 3/4” NPT-M threads for mounting a junction box and integral 5/8-24
threads for mounting a submersible connector if desired (see Figure 1).
Figure 1: Transducer Assembly
C-ET Ultrasonic Flow Transducer System Installation Guide 1
2.1 Solid Sheet Couplants
GE supplies a solid sheet couplant for C-ET transducer installations. 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. Therefore, the C-ET transducers should be pressed tightly against the
pipe surface.
GE provides a variety of solid sheet couplants for extremely high- and low-temperature applications. Standard GE
couplants are listed in Table 1.
Table 1: Solid Sheet Couplants
Part No. Type Temp. Range Use
CPL-12 Standard –20° to +400°C (-4° to +752°F) Permanent
CPL-13 Cryogenics –250° to 100°C (-418° to +212°F) Permanent
CPL-14 Gold Only Applications –20° to +400°C (-4° to +752°F) Permanent
CPL-15 Z inc Only Applications –20° to +400°C (-4° to +752°F) Permanent
CPL-S Special As required Difficult Applications*
*Installations where gold or zinc cannot be used. Consult GE for these applications.
2 C-ET Ultrasonic Flow Transducer System Installation Guide
3. Installing the C-ET Transducer System
V Fixture
PI Fixture
GE offers the following fixtures to suit your applications needs:
• V clamping fixture
• PI clamping fixture
Figure 2 shows the V and PI fixture assemblies (less solid couplant). Complete the steps in the following sections to
position and install the transducers and fixtures.
Figure 2: V and PI Fixtures
C-ET Ultrasonic Flow Transducer System Installation Guide 3
Transducer
Pipe
Signal Path
End View
3.1 Choosing an Installation Location
1. Locate the transducer measurement point at least 3 ft (1 m) from any butt welds or flanges, ideally in the center of
a 20 diameters of straight run of pipe. Keep appropriate clearance on either side of the pipe for easy transducer
installation:
• 6 in. (15 cm) if you are not using a junction box, or
• 9 in. (23 cm) if you are using a junction box.
Note: To guarantee the specified accuracy of the flowmeter there is no substitute for straight run and fully-developed
flow profile. However, if straight run is not available, the transducer location should be in a position such that
the acoustic signal travels through the full distribution of the under -developed flow profile for best repeatability.
2. Choose a location that has at least 10 pipe diameters of straight, undisturbed flow upstream and 5 pipe diameters
downstream from the measurement point. Providing undisturbed flow means avoiding sources of turbulence such
as flanges, elbows and tees; avoiding swirl; and avoiding disturbed flow profiles. Never install the flowmeter
directly downstream of control valves, especially butterfly valves. If you cannot find an ideal location, use a
downstream location of straight run in excess of 5 pipe diameters.
3. Place the transducers as close as possible to the horizontal plane. Locate the transducers on opposite sides of the
o
pipe 180
pipe.
apart, ideally at the 3 and 9 o’clock positions. Do not place transducers on the top or bottom of the
4. The following is a guide for the recommended wall thickness in which to install the C-ET transducers. The C-ET
transducer cannot be installed on wall thicknesses between 0.27 in (6.86 mm) and 0.33 in (8.38 mm). On page 5
and page 6 are two charts showing typical pipe sizes.
4 C-ET Ultrasonic Flow Transducer System Installation Guide
Figure 3: Transducer Locations
3.1a Application Guide - Wall Thickness (in inches)
Nominal
Pipe Size
3 1/2 4.000 0.226 0.226
Outside
Diameter
(in) (in) 10 20 30 STD 40 60 XS 80 100 120 140 160 XXS
3 3.500 0.216 0.216
4 4.500 0.237 0.237 0.337 0.337 0.438 0.531 0.674
5 5.563 0.258 0.258 0.375 0.375 0.500 0.625 0.75
66.625
8 8.625 0.250
10 10.750 0.250
12 12.750 0.250
14 14.000 0.250
16 16.000 0.250
18 18.000 0.250
20 20.000 0.250 0.375 0.500 0.375 0.594 0.812 0.500 0.938 1.156 1.375 1.562 1.781
22 22.000 0.250 0.375 0.500 0.375 0.875 0.500 1.125 1.375 1.625 1.875 2.125
24 24.000 0.250 0.375 0.562 0.375 0.688 0.989 0.500 1.219 1.531 1.812 2.062 2.344
0.312 0.375 0.375 0.438 0.594 0.500 0.750 0.938 1.094 1.25 1.406
0.312 0.375 0.375 0.500 0.656 0.500 0.844 1.031 1.219 1.438 1.594
0.312 0.438 0.375 0.562 0.750 0.500 0.938 1.156 1.375 1.562 1.781
0.277 0.322 0.322 0.406 0.500 0.500 0.594 0.719 0.812 0.906 0.875
0.307 0.365 0.365 0.500 0.500 0.594 0.719 0.844 1.000 1.125 1.000
0.330 0.375 0.406 0.562 0.500 0.688 0.844 1.000 1.125 1.312 1.000
0.280 0.280 0.432 0.432 0.562 0.719 0.864
Schedule
Wall Thickness (in)
0.300 0.300 0.438 0.600
0.318 0.318
Note: Pipe sizes not suitable for C-ET installations are highlighted in red.
C-ET Ultrasonic Flow Transducer System Installation Guide 5
3.1b Application Guide - Wall Thickness (in millimeters)
Nominal
Pipe Size
(mm) (mm) 10 20 30 STD 40 60 XS 80 100 120 140 160 XXS
Outside
Diameter
80 88.90 5.49 5.49
90 101.60 5.74 5.74
100 114.30 6.02 6.02 8.56 8.56 11.13 13.49 17.12
125 141.30 6.55 6.55 9.53 9.53 12.70 15.88 19.05
150 168.28
200 219.08 6.35
250 273.05 6.35
300 323.85 6.35 8.38 9.53 10.31 14.27 12.70 17.48 21.44 25.40 28.58 33.32 25.40
350 355.60 6.35
400 406.40 6.35
450 457.20 6.35
500 508.00 6.35 9.53 12.70 9.53 15.09 20.62 12.70 23.83 29.36 34.93 39.67 45.24
550 558.80 6.35 9.53 12.70 9.53 22.23 12.70 28.58 34.93 41.28 47.63 53.98
600 609.60 6.35 9.53 14.27 9.53 17.48 25.12 12.70 30.96 38.89 46.02 52.37 59.54
7.92 9.53 9.53 11.13 15.09 12.70 19.05 23.83 27.79 31.75 35.71
7.92 9.53 9.53 12.70 16.66 12.70 21.44 26.19 30.96 36.53 40.49
7.92 11.13 9.53 14.27 19.05 12.70 23.83 29.36 34.93 39.67 45.24
7.04 8.18 8.18 10.31 12.70 12.70 15.09 18.26 20.62 23.01 22.23
7.80 9.27 9.27 12.70 12.70 15.09 18.26 21.44 25.40 28.58 25.40
7.11 7.11 10.97 10.97 14.27 18.26 21.95
Schedule
Wall Thickness (mm)
7.62 7.62 11.13 15.24
8.08 8.08
Note: Pipe sizes not suitable for C-ET installations are highlighted in red.
6 C-ET Ultrasonic Flow Transducer System Installation Guide
3.2 Obtaining the Transducer Spacing
3.2a Determining Special Transducer Parameters
The C-ET transducers must be programmed in the flowmeters as special transducers. As specials, four parameters are
required: Frequency, Tw, We dge Angle, and Wedge Soundspeed.
Frequency: Frequency is determined based on the part number of the C-ET transducer, and it can be found on the
C-ET label.
Figure 4: C-ET Parameters Label
The CRS-XX-MB defines the frequency of the transducers as follows:
If “XX” = 05, then the frequency =.5MHz.
If “XX” = 10, then the frequency = 1MHz.
Tw: Tw (time in wedge) is determined by the transducer frequency, nominal process temperature , and ambient
temperature using Graph #1 (Figure 5 on page 8) or Graph #2 (Figure 6 on page 9) based on the transducer frequency.
As an example:
If Transducer Frequency = 0.5MHz
Ambient Temperature = 20°C
Nominal Process Temperature = 340°C
Tw would be: 150µs
Wedge Angle: W edge angle is determined by the nominal process temperature and ambient temperature using Graph #3
on page 10 similar to Tw above.
As an example:
If Ambient Temperature = 20°C
Nominal Process Temperature = 340°C
Wedge Angle would be: 57.2 degrees
Wedge Soundspeed: Wedge soundspeed is always 10104.9 ft/s (3080.0 m/s) for the C-ET transducer.
C-ET Ultrasonic Flow Transducer System Installation Guide 7
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