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DigitalFlow CTF878 - thomsen-messtechnik.com

GE. Sensing Applications Features The DigitalFlow CTF878 clamp-on gas flowmeter is a Suitable for metal pipes with pressures as low as complete ultrasonic flow metering system for atmospheric pressure measurement of most gases, including: Clamp-on unobstructed installation Natural gas No wetted parts Compressed air No moving parts Fuel gases No pressure drop Corrosive gases Simple installation Toxic gases Standard volumetric calculation High-purity gases Suitable for a wide range of temperatures Air separation gases High velocity capability Specialty gases DigitalFlow CTF878 . Panametrics Correlation Tag Clamp-On Gas ultrasonic Flowmeter DigitalFlow CTF878 is a Panametrics product. Panametrics has joined other GE high-technology sensing businesses under a new name_.

GE Sensing Applications DigitalFlow™ CTF878 Panametrics Correlation Tag Clamp-On Gas Ultrasonic Flowmeter DigitalFlow CTF878 is a Panametrics product. Panametrics has joined

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Transcription of DigitalFlow CTF878 - thomsen-messtechnik.com

1 GE. Sensing Applications Features The DigitalFlow CTF878 clamp-on gas flowmeter is a Suitable for metal pipes with pressures as low as complete ultrasonic flow metering system for atmospheric pressure measurement of most gases, including: Clamp-on unobstructed installation Natural gas No wetted parts Compressed air No moving parts Fuel gases No pressure drop Corrosive gases Simple installation Toxic gases Standard volumetric calculation High-purity gases Suitable for a wide range of temperatures Air separation gases High velocity capability Specialty gases DigitalFlow CTF878 . Panametrics Correlation Tag Clamp-On Gas ultrasonic Flowmeter DigitalFlow CTF878 is a Panametrics product. Panametrics has joined other GE high-technology sensing businesses under a new name_.

2 GE Industrial, Sensing. g GE. Sensing Large-Pipe, High-Velocity, Correlation Tag Technology Clamp-On Gas Flowmeter The DigitalFlow CTF878 uses an ultrasonic signal pattern The DigitalFlow CTF878 clamp-on gas flowmeter utilizes recognition technology, called correlation tag, for flow a new technology called correlation tag (patented) to measurement. Correlation tag technology utilizes a total determine gas flow rate. This technique is very different of four clamp-on transducers externally mounted on a from traditional ultrasonic transit-time measurement pipe. The transducers are arranged in two pairs, one and is well-suited for gas applications. The DigitalFlow upstream and one downstream. Each pair includes one CTF878 can measure a wide range of velocities in small transmitter sending ultrasound in a continuous wave to large pipes up to 150 ft/s (46 m/s), giving it broad mode through the fluid to its receiver, forming an applicability in gas flow measurement.

3 It is used on upstream and downstream interrogation path. The plastic and metal pipes from 6 to 30 in (150 to 750 mm) continuous wave signal is modulated by turbulence and in diameter. Accuracy is excellent better than 2 percent local density variations that are characteristic of a of reading with repeatability of percent of reading. moving gas. Thus, both sets of the received signal The turndown ratio is 43-to-1. contain a unique turbulence signature of the flowing gas. The received ultrasonic signals are demodulated and The DigitalFlow CTF878 flowmeter can be used in processed through a correlation algorithm. With applications where penetrating the pipe wall is turbulent flow conditions, a distinct correlation peak is undesirable, making it ideal for erosive, corrosive, toxic, recorded, which reflects the time it took for the unique high-purity or sterile gases.

4 Because the pipe is not turbulence signature to travel past each ultrasonic tapped or cut, the cost for permanent installation is interrogation path. Since the distance between each considerably lower than with other meters. There are no interrogation path is defined in the transducer set-up, wetted or moving parts, there is no pressure drop, and the flow velocity is determined by dividing distance by maintenance is seldom required. the time it took for the turbulence signature to pass between each interrogation path. A complete system comprises the DigitalFlow CTF878 . electronics, two pairs of advanced clamp-on gas ultrasonic transducers, two preamplifiers for the receiving transducers and a clamping fixture to mount the transducers on the pipe.

5 X1 (t). R12 (t). X1 (t) X2 (t) Correlation Demodulation X2 (t) R12 (t). Two sets of data are tagged and cross Receivers correlated through proprietary algorithms FLOW. t Station 1 Transmitters Station 2 t0. A distinct correlation peak is formed for the time measurement (R12). Tag Path Schematic representation of a correlation tag flowmeter setup GE. Sensing Advanced Clamp-On Gas ultrasonic Wide Range of Clamping Transducers Fixtures Available One of the biggest challenges in developing clamp-on Transducer alignment is crucial in obtaining accurate ultrasonic transducers for gas applications is the measurements in clamp-on gas installations. GE offers a difficulty in transmitting an ultrasonic signal through a wide range of clamping fixtures to help ensure proper metal pipe wall, through the gas, and then back through alignment of transducers with minimal effort.

6 The pipe wall to the second transducer that is waiting to receive the signal. In gas systems, only x 10-7 percent of the transmitted sound energy is actually received by Convenient Installation traditional ultrasonic transducers. This simply isn't enough to produce reliable measurements. Straightforward installation is another advantage of the DigitalFlow CTF878 flowmeter. The system consists of New GE clamp-on gas transducers produce signals that two pairs of transducers, a clamping fixture, two are five to ten times more powerful than signals of preamplifiers, and an electronics console. The traditional ultrasonic transducers. The new transducers transducers are clamped onto the outside of the existing produce clean, strong signals with very minimal pipe.

7 The electronics console can be located up to 500 ft background noise. The result is that the DigitalFlow (150 m) from the transducers. Setup and output options CTF878 flowmeter system performs well even in allow the DigitalFlow CTF878 flowmeter to be customized low-density gas applications. for any process. No Pressure Drop, Low Maintenance Because the transducers clamp onto the outside of the pipe, they do not obstruct the flow inside the pipe. This prevents the pressure drops typically caused by other types of flowmeters. The DigitalFlow CTF878 has no The CR-L transducer is one type of components that will foul or collect debris, and there are technologically advanced, clamp-on no moving parts to wear out. As a result, it requires no gas ultrasonic transducers available.

8 Lubrication and little or no routine maintenance. Tag path Junction box Upstream Downstream with receiver receiver preamplifiers Junction box with preamplifiers default 2004/01/22 2:23 PM. Volume, m 3/s Velocity, m/s Velocity, m/s 34. 0 20 30. Transducer Diagnostics Save Now FLOW. Junction Transducer Junction box Spacing Upstream box Transmitter Downstream Transmitter Typical meter setup GE. Sensing Electronics CTF878 Flow Measurement Specifications Correlation tag technique Enclosures Standard: Epoxy-coated aluminum Operation and Performance Weatherproof: Type 4X/IP66. Optional: Stainless steel C-US Class I, Division 2, Groups A,B,C&D (pending). Fluid Types All acoustically conductive gases. Minimum gas density: Dimensions lb/ft3 ( kg/m3). Gas should not be Standard: Weight 11 lb (5 kg), wet or saturated with moisture.

9 Size (h x w x d) in x in x in (362 mm x 290 mm x 130 mm). Pipe Sizes 6 in to 30 in NB ANSI (152 mm to 762 mmDN) Channel Single channel Pipe-Wall Thickness Up to Sch 80 Display 240 x 200 pixel backlit LCD graphic display Pipe Materials Most metals and plastics. No lined pipes. Keypad 24 key rubberized tactile membrane Flow Accuracy (Velocity). 2% of reading at to 150 ft/s Power Supply ( to 46 m/s) typical Standard: 85 to 264 VAC, 50/60 Hz Repeatability Operating Temperature to at to 150 ft/s 14 F to 131 F ( 10 C to 55 C). ( to 46 m/s). Storage Temperature Range (Bidirectional) 40 F to 158 F ( 40 C to 70 C). 150 to ft/s ( 46 to m/s). Standard Inputs/Outputs Rangeability (Overall) Two 0/4 to 20 mA isolated outputs, 550 S maximum load 43:1. Optional Inputs/Outputs Specifications assume a fully developed flow profile There are six additional slots available for any (typically 20 diameters upstream and 10 diameters combination of the following I/O boards: downstream of straight pipe run).

10 Analog outputs: Select additional output boards, with four isolated 0/4 to 20 mA outputs, 1 kS maximum Gas Type and Minimum Pressure load Dry air, oxygen, nitrogen or argon psia (1 bara). sweet natural gas 25 psia ( bara) Analog inputs: Select one of the following types: Analog input board with two isolated 4 to 20 mA. Measurement Parameters inputs and 24 V loop power Velocity, actual and standard volumetric flow, and RTD input board with two isolated, totalized flow three-wire RTD inputs; span 148 F to 662 F. ( 100 C to 350 C); 100 S Pt GE. Sensing Clamp-On Transducers CTF878 Temperature Range Specifications 40 F to 266 F ( 40 C to 130 C). Area Classifications II 2 GD EEx md IIC T6. Totalizer/frequency outputs: Select output boards, -40 F to 167 F ( 40 C to 75 C), Kema 02 ATEX2337X.


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