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CTF878 Clamp On Gas Meter

Only flowmeter worldwide to measure low pressure flows (<5 bar): Worldwide support/installation by experienced engineers
No Downtime - minimal installation costs: Wide range of applications including natural gas, corrosive/toxic gases, low pressure
Correlation Tag Technology: Unique technology providing accuracies of +/-1 to 2% of rate. AGA compliant
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Overview

Specifications

Case Studies

Related Products

The DigitalFlow CTF878 Correlation Tag Clamp-on Gas Ultrasonic Flowmeter is suitable for metal pipes and for pressure as low as atmospheric. It is non-invasive, has no wetted parts or moving parts. There is therefore no process down time or significant installation costs for this clamp on technology.

The CTF878 uses a new technology called correlation tag, to determine the flow rate of gases. This is like no other clamp on gas flowmeters. The CTF878 flow meter is supplied with two pairs of ultrasonic transducers - the first measure the upstream disturbance, and the second (situated downstream) record the downstream disturbance. The flow meter constantly samples these traces and correlates the two traces. When the flow meter recognises that the same disturbance pattern has travelled along the pipe, it is possible to measure the velocity. This is done constantly every second. Each pair of transducers includes a transmitter sending ultrasound in a continuous wave mode through the fluid to the receiver, forming an upstream and downstream interrogation path. The continuous wave signal is modulated by turbulence and local density variations that are characteristic of a moving gas.

In the past, a restricting factor in gas measurement has been the signal strength of transducers: having to send an ultrasonic signal through the metal pipe wall, through the gas, and then back through the pipe wall again. New clamp-on gas transducers produce signals that are five to ten times more powerful than signals of traditional ultrasonic transducers. This new technology produces clean, strong signals with marginal background noise.

Specifications assume a fully developed flow profile (typically 20 diameters upstream and 10 diameters downstream of straight pipe run).

Manufactured by: Panametrics

Model: CTF878 Clamp On Gas Meter

Services offered for this product

Sales
Rental
Installation
Calibration
Maintenance

Applications

Natural gas
Compressed air
Low Pressure Applications
Fuel gases
Corrosive gases
Toxic gases
High-purity gases
Air separation gases
Speciality gases

Operation and performance
Fluid types	All acoustically conductive gases. Minimum gas density: 0.074 lb/ft3 (1.2 kg/m³). Gas not be wet or saturated with moisture.
Pipe sizes	2 to 36 in. NB ANSI (50 to 900 mm DN)
Pipe materials	Most metals and plastics. No lined pipes
Flow accuracy (velocity)	±2% of reading
Repeatability	±0.2% to 0.6%
Range (bi-directional)	±10 to ±200 ft/s (2 to 2.5 in./50 to 60 mm pipe size) ±7 to ±200 ft/s (3 to 3.5 in./80 mm to 90 mm pipe size) ±5 to ±200 ft/s (4 to 5 in./100 to 125 mm pipe size) ±3.5 to ±200 ft/s (6 to 36 in. or 150 to 900 mm pipe size)
Gas type and minimum pressure	Dry air, oxygen, nitrogen or argon: ≥14.5 psia (1 bara) Sweet natural gas: ≥25 psia (1.7 bara)
Measurement parameters	Velocity, actual and standard (ideal gas) volumetric flow, and totalized flow
Electronics
Flow measurement	Correlation tag technique
Enclosures	Standard: Epoxy-coated aluminum Optional: Stainless steel
Dimensions (h x w x d)	362 x 290 x 130 mm (14.24 x 11.4 x 5.12 in)
Weight	5 kg (11 lb)
Channel	Single channel
Display	240 x 200 pixel backlit LCD graphic display
Keypad	24-key rubberized tactile membrane
Power supply	85 to 264 VAC, 50/60 Hz (standard)
Operating temperature	–10 to 55°C (14 to 131°F)
Storage temperature	–40 to 70°C (–40 to 158°F)
Standard inputs/outputs	Two 0/4 to 20 mA isolated outputs, 550 Ω maximum load
Optional inputs/outputs	There are six additional slots available for any combination of the following I/O boards: Analog outputs: select additional output boards, with four isolated 0/4 to 20 mA outputs, 1 kΩ maximum load Analog inputs: select one of the following: Analog input board with two isolated 4 to 20 mA inputs and 24 V loop power RTD input board with two isolated, three-wire, RTD inputs; span –148 to 662°F (–100 to 350°C); 100 Ω Pt Analog input board with two isolated 4 to 20 mA inputs and 24 V loop power – RTD input board with two isolated, three-wire, RTD inputs; span –148 to 662°F (–100 to 350°C); 100 Ω Pt Totalizer/frequency outputs: select output boards, with four outputs, software-selectable functioning in two modes: Totalizer mode: pulse per defined unit of parameter (e.g., 1 pulse/ft³) Frequency mode: pulse frequency proportional to magnitude of parameter (e.g., 10 Hz = 1 ft³/h), 10 kHz maximum Alarm relays: select one of the following: General purpose: relay board with three Form C relays Hermetically sealed: relay board with three hermetically sealed Form C relays
Digital interfaces	Standard: RS232 Optional: RS485 (multiuser)
Data logging	Memory capacity (linear and/or circular type) to log over 6900 flow data points
Display functions	Graphic display shows flow in numerical or graphic format Displays logged data and diagnostics
European compliance	2014/30/EU EMC Directive 2014/35/EU LVD Directive (Installation Category II, Pollution Degree 2)

Flare Gas Flow Measurement Survey Using CTF878

Case Study - Understanding Clamp-on Gas: Conditions Required for Measuring Gas Flow with Ultrasonic Technology

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