Onicon F-2600 Instrukcja Użytkownika Pobierz pdf (Strona 16)

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F-2600 & F-2700 Vortex Flow Meter Manual 02/15 - 0808-7 / 19204 Page 16

As shown in Figure 3, F-2600 & F-2700 meters exhibit a constant Strouhal number across

a large range of Reynolds numbers, indicating a consistent linear output over a wide

range of ows and uid types. Below this linear range, the intelligent electronics in the

meter automatically corrects for the variation in the Strouhal number with the Reynolds

number. The meter’s smart electronics corrects for this non-linearity via its simultaneous

measurements of the process uid temperature and pressure. This data is then used to

calculate the Reynolds number in real time. The meter automatically corrects down to a

Reynolds number of 5,000.

Figure 3. Reynolds Number Range for the meter

1.2.5 Temperature Measurement

This ow meter uses a 1000 ohm platinum resistance temperature detector (PRTD) to

measure uid temperature.

1.2.6 Pressure Measurement

Both versions of the meter incorporate a solid-state pressure transducer isolated by a 316

SS diaphragm. The transducer itself is micro-machined silicon, fabricated using integrated

circuit processing technology. A nine-point pressure/temperature calibration is performed

on every sensor. Digital compensation allows these transducers to operate within a 0.3%

of full scale accuracy band within the entire ambient temperature range of -40°F to 140°F

(-40°C to 60°C). Thermal isolation of the pressure transducer ensures the same accuracy

across the allowable process uid temperature range of -330°F to 750°F (-200°C to 400°C).

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Onicon F-2600 Instrukcja Użytkownika Strona 16