Vortex - Model CV-P - Electric Meters
From Vortex Meters
The meter of choice for high pressure saturated and super-heated steam capable of measuring liquid, steam and gas. The Cadillac® Piezo Electric Vortex (CV-P) Meter is a rate and totalizing meter which is capable of measuring liquid, steam and gas. Due to its piezoelectric sensor technology it is particularly suitable for direct high pressure saturated and superheated steam measurement. In any high pressure saturated or superheated steam application, the Cadillac® Vortex meter is the number one technology choice due to Cadillac®’s accuracy, linearity, reliability and rangeability.
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Products Details
Like many other flow meters, the Cadillac® Vortex meter is a velocity measuring device which computes flow by multiplying the effective cross sectional area of the flow meter with the detected fluid velocity. The meter has no moving parts and consists of a rugged vortex strut with embedded piezoelectric crystals and an amplifier assembly. It detects velocity by measuring the frequency of the vortices, as the peel off the vortex strut of the flow meter. The frequency of these “Karman” vortices is directly proportional to the velocity of the moving fluid, whether this is a gas or liquid.
The Cadillac® Piezo Electric Vortex (CV-P) Meter – Mass flow compensation for super-heated steam.
For compressible fluids, such as superheated steam, an external pressure input (4-20 mADC) into the meter electronics is required to provide mass flow computation. Cadillac® Meter also offers a complete line of Pressure elements.
Applications & Features
The Cadillac® Vortex CV-P Meter is the meter of choice for high pressure saturated and super-heated steam. This meter can be applied effectively for the following purposes:
- Direct Steam measurements at both boiler and point of use locations.
- Super heat steam applications where extreme pressures/temperatures exist.
- All compressible fluids such and Air, Natural gas, Steam and others.
- No conductive fluids where Magnetic flow meters will not operate.
- Energy measurements where compressible media is being measured.
Cadillac® Vortex CV-P Meter – Features
Cadillac® Vortex CV-P Meter includes the following features:
Accuracy
+/- 0.75% of reading for liquids
+/-1.0% of the reading for liquids, gas, and steam.
No start-up tuning
Automatically selects the optimum settings even in noisy environments
Advanced self-diagnostics
Analysis of the process allows true condition based maintenance and adjustments.
Clear parallel two line LCD display
Displays simultaneous flow rate and total along with process diagnostics
Dual outputs
Simultaneous analog (4-2 mADC) and pulse outputs
Multivariable Option (MASS)
With Mass feature integral temperature sensor (PT1000) mbedded in shedder bar. Electronics provided with saturated steam tables and ideal gas values for other compressible media.
Rangeability
With seasonal steam load variation, the need for a large turndown is essential. Cadillac® Vortex Meters will accurately measure all load requirements with proper sizing. Typical 20 to 1 turndown or better.
Longevity
With no moving parts and through simple robust design the MTBF of the shedder bar is 50 years. With proper system maintenance Cadillac® Vortex Meters will provide reliable, accurate service beyond all flow technologies.
Operation Principles
The “Karman” vortex meter principle is clearly illustrated by a flag waving in the wind. As the air passes across the flag pole, vortices peel off and the flag is shaped by these pressure areas. You will notice that, at low wind velocity, the flag will move slowly from side to side. As the wind increases, the flag will start to flutter and ripple, representing the increased frequency and intensity of these flag pole generated vortices as they pass. Wind velocity can thus be determined by measuring the frequency of that flutter.
The shedder bar of the Cadillac® Vortex Meter is a solid piece of metal machined into a shape to maximize the strength of the vortex. As this vortex peels off, it temporarily causes a low-pressure area on one side, which puts sideways stress on the shedder bar. This stress is detected by embedded pressure sensitive piezoelectric crystals, which produce a voltage spike when compressed. By detecting and counting the frequency of these spikes, we can establish fluid velocity. Each vortex meter is tested to determine the relationship between velocity/flow rate and vortex frequency, which results in a meter K-factor expressed in “Pulses/Gallon”. This volumetric relationship is then converted to relative engineering units, which the flow meter converter can then retransmit via a 4-20 mADC current signal or conditioned pulse.
An optional LCD Indicator/Totalizer can display and totalize in engineering units of the users choice. For compressible mediums, such as gases and steam, the meter amplifier can correct for temperature and pressure with the MASS option, which includes a temperature element in shedder bar and look up tables for ideal gases and steam. For mediums other than saturated steam an external pressure source must be provided as shown in the drawing below. Outputs from the meter with the MASS option are compensated and linear for the compressible medium being measured.
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