GE Sensing C-ET Specifications

GE

Measurement & Control

C-ET

Panametrics Clamp-on
Waveguide Transducer
System

Applications

The clamp-on extended temperature (C-ET)
range transducer system provides liquid

ow 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,

allowing 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.

Applications include:

Features and Benets

• Waveguide technology allows

measurements at extremely high
process temperatures (400°C/750°F) and
extremely low process temperatures
(-200°C/-328°F)

• Clamp-on—no process shutdown to

install

• No penetration into the pipe—no risk of

leaks, no restriction to cause clogging

• No pressure drop

• Bi-directional measurement

• No drifting or periodic calibration

• Little to no maintenance

• Reneries—coker, crude distillation, vacuum

distillation, crackers, hydrotreaters, visbreakers

• Powerplants—boiler feed

• Cryogenic

• Low ow measurement (down to 0.03

m/s or 0.1 ft/s)

Waveguide Technology Handles

Installation Options—
Tough Flow Measurement
Applications

The C-ET clamp-on transducer system is

designed for extremely high and extremely low
process temperature applications in liquid ow
measurement. The C-ET waveguide transducer

system overcomes the problems of traditional
clamp-on methods at high temperatures, extending
the range of measurement up to 400°C (750°F). In
addition, the C-ET transducer can be used for very

low cryogenic temperature applications to –328°F
(–200°C).

Designed for use with GE DigitalFlow™ ultrasonic
ow meters, the C-ET clamp-on transducer consists

of an ultrasonic transducer mounted on top of a

waveguide or steel buer. The waveguide removes

the transducer from the application process

temperature extremes, allowing it to be used where
measurements were previously not possible.

The C-ET Design

The C-ET system utilizes a solid waveguide that
resembles a thin ice hockey stick, along with

our C-RS transducers. The robust design is an

improvement to the original OKS buer system

released in the 1980s. It maximizes the signal-to-

noise ratio for a more accurate ow measurement
and maximizes the heat exchange away from

the C-RS transducer. With ultrasonic operating

frequencies of 0.5 and 1 MHz, the C-ET waveguide

transducer system can be used on a variety of

liquids, from superheated water and hot, heavy
hydrocarbons, to cryogenic liqueed natural gas.
The waveguide will keep the piezoelectric element
considerably within its operating temperature, thus
ensuring an indenite life for the transducer.

Choices for All Applications

The C-ET transducer system can be used not only in

a variety of applications, but can also be installed in

numerous convenient ways.

For smaller sized pipes, use the GE stainless steel

V-style clamping xture to accurately align the

transducers. For larger sized pipes, the PI-style

stainless chain xture is used to provide a exible

mounting solution. With either xture, a solid couplant

is used to mount transducers to the pipe, minimizing

future maintenance.

Advanced Technology

C-ET Waveguide Systems

When combined with any of the DigitalFlow™

ultrasonic ow meters, the C-ET transducer system

takes advantage of GE’s patented Correlation

Transit-Time™ technique and advanced digital-

signal processing. The C-ET transducer system

and DigitalFlow ow meters provide the proven

technology and accuracy that have made GE a leader

in innovative instrumentation technology.

Chaining option

C-ET sensor

Clamping option

C-ET Specications

Operation and Performance

Specications assume a fully developed ow
prole (typically 10 diameters upstream and 5

diameters downstream of straight pipe run) and

ow velocity greater than 0.3 m/s (1 ft/s).

Pipe Sizes

3 in to 24 in (80 to 600 mm) NB and larger

Pipe Wall Thickness

Up to 3 in (80 mm)

Flow Accuracy (Velocity)

• Pipe ID>6 in (150 mm): ±1% to 2% of reading

• Pipe ID<6 in (150 mm): ±2% to 5% of reading

Accuracy depends on pipe size and whether
measurement is one-path or two-path.
Accuracy to ±0.5% of reading may be
achievable with process calibration.

Clamp-on Ultrasonic Flow
Transducers

Temperature Range

Process: –200°C to 400°C (-328°F to 750°F)

Ambient: -40°C to 75°C (-40°F to 167°F)

Materials

Fixture: stainless steel
Waveguide: stainless steel
Transducer: stainless steel and plastic
Transducer Holder: coated aluminum

Certications (Integral C-RS Transducer)

• CSA certied (Class 1, Div. 1, Groups B, C, and D)

• ATEX certied (II 2 GD Eex md IIC T6 T=80°C)

Ordering Information

X- X- X- X- X X- X-
C-ET Pair of high performance clamp-on transducers for extreme temperature applications consisting
of C-RS transducers, waveguide, mounting xture, and couplant. Maximum operating process
temperature of -200°C to 400°C (-328°F to 752°F)

05 0.5 MHz frequency C-RS transducers
10 1 MHz frequency C-RS transducers

00 No junction box

AX CSA certied, epoxy coated aluminum, junction box (Class 1, Div. 1, Groups B, C and D)
EX ATEX certied, epoxy coated aluminum, junction box (II 2 GD Eex md IIC T6 T=80°C)
EXSS ATEX certied, stainless steel, junction box (II 2GD Eex md IIC T6 T=80°C)

V4 V4 bracket clamping xture for pipes from 3-4 in (80 to 100 mm)
V8 V8 bracket clamping xture for pipes from 4-8 in (100 to 200 mm)
V12 V12 bracket clamping xture for pipes from 8-12 in (200 to 300 mm)
PIC PIC chain clamping xture for pipes from 8-24 in (200 to 600 mm)

<> <> Pipe Size
IN Pipe outer diameter - in
MM Pipe outer diameter - millimeters

12 Couplant #12 (Temperature range -20 to 400°C)
13 Couplant #13 (Temperature range -200 to 100°C)
14 Couplant #14 (Temperature range -20 to 400°C)
15 Couplant #15 (Temperature range -20 to 400°C)

0 Standard product
S Special

— — — — — — —

www.ge-mcs.com

920-567A

© 2011 General Electric Company. All Rights Reserved. Specications are subject to change without notice. GE is a registered trademark of General Electric Company. Other company or product
names mentioned in this document may be trademarks or registered trademarks of their respective companies, which are not aliated with GE.