TekProbe PR8 – Averaging Pitot Multivariable Flow Sensors

Product Description

The TekProbe PR3 Multivariable Averaging Pitot Flow Sensor brings new advances in the art of accurate, wide ranging, insertion averaging Pitot tubes for use with liquids, gases and steam. Pipe or duct sizes are from 50mm to 2000mm (2” to 80”). The TekProbe PR3 introduces for the first time a multi-port insertion, multivariable averaging system, with noise free differential pressure (dp) between flow impact pressure and a true static pressure. The differential pressure is proportional to mass or volumetric flow rate.

Other averaging Pitots measure the differential between impact pressure and suction, or have an erroneously called ‘static’ pressure port on the sensor itself. Both methods compromise signal to noise ratio, the non-linearity of flow coefficient, as well as providing an erroneous static pressure signal to the dp cell. This results in compromised accurate flow measurement and multivariable computation uncertainty.

The TekProbe PR3 averages velocity profile in a pipe or duct normally with a single averaging sensor. Six impact pressure ports
are spaced on the upstream side of the TekProbe, in accordance with USA Code of Federal Regulations 40CFR60, the ASHRAE Handbook, and the internationally accepted log Tchebycheff rule to ISO 3966. The true static pressure is uniquely sensed and protected by the TekProbe’s pipe/duct connection, away from the flow cross section, such that it is unaffected by the turbulent media and provides a noise free signal.

The TekProbe PR3 in its simplest form may be used for NIST and UKAS traceable volumetric flow measurement. Alternatively, the multi-variable version may be used for density compensated mass flow, or volumetric flow corrected to refererence conditions, where dp, true static pressure and temperature are measured on single device.

TekProbe PR3 is compatible with any proprietary dp cell of suitable low range capability. However, Tekflo guarantees operation to specification straight out of the packing crate using its own low range, nanotechnology TekFab DP02 and DP04 DP Cells.

The TekProbe DP02 all-digital, multivariable dp cell embodies two nano molecular crystal silicon resonators, vibrating at their natural frequencies. When the TekProbe dp is applied across them, a +ve resonator vibrates in compression mode, and a -ve in tension mode. The differential frequency provides the dp signal, while the Tekprobe’s true static pressure provides an unmatched total system flow accuracy, repeatability, resolution, with zero hysteresis. The TekFab DP04 is a low cost, nanotechnology, variable capacitance dp cell. It is non-multivariable, but without compromising accuracy and stability. (See separate TekFab DP02 and DP04 DP Cell specifications)

Product Features

• The world’s first all-digital Multivariable, true static averaging Pitot, with digital square root extraction
• The only averaging Pitot to measure impact pressure and true static pressure to provide uncompromised accurate volumetric, mass or energy flow sensing
• The only averaging Pitot with a linearity to ± 0.5% of reading > 0.5 m/s (1.6 fps) liquids, or gas and steam Reynolds Numbers > 50,000
• The only averaging Pitot offering true static sensing, truly in according to Classical Bernoulli Theory
• The only averaging Pitot to measure √ (mean dp) to respond accurately to pulsatile flow
• The only true profile averaging Pitot with 6 sensing ports in accordance with USA 40CFR60 Code of Federal Regulations and ASHRAE Handbook and log Tchebycheff rule to ISO 3966 single diameters
• Complete multi-variable system available, including dp, true static pressure, with Tekprobe PR3 protected temperature sensor, all digital dp cell, steam flow condensate pots, valves, manifolds
• USA NIST and CEGB Hams Hall (UK Accreditation Service) traceable, customized Flow Certificate
• FM and CSA Explosion Proof Approval to Class 1, Div 1, or FM, CSA and ATEX intrinsic safety
• FOUNDATION Fieldbus, RS 485 Modbus and 4-20mA outputs with HART Protocols
• Tekprobe installation costs > 25% less than 100mm orifice plate, and > 75% less than 500mm orifice

Product Specifications

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