SAO Flow Meters

Calibration Venturi

SAO (Smooth Approach Orifice) Flow Meters consist of a machined and polished aluminum body with a brass throat insert. 304 stainless steel is available as an option. Each SAO venturi is calibrated from 10% to 120% of the specified flow rate. An NBS traceable calibration report from CEESI is furnished with the device.

HORIBA's Smooth Approach Orifice calibration venturi has several advantages over Laminar Flow Elements (LFEs).

  • Excellent Stability SAOs retain their original calibration accuracy (unless mechanically abused), while LFEs experience a slow shift in calibration due to dust collection and filter obstruction.
  • High Accuracy Measurement SAO accuracy is ±0.5% of reading, while LFE accuracy is typically ±0.5% of full scale. Therefore, SAO accuracy is higher than LFE accuracy at all flows less than full scale.
  • Minimal Pressure Loss Thanks to a high-efficiency recovery design, SAO calibration venturis experience much less pressure loss than LFEs. At the same flow capacity and pressure rating, an SAO recovers about 80% of measured throat pressure, while pressure drop across an LFE cannot be recovered.

Specifications - English Units

SAO Calibration Venturis

Contact HORIBA for flow rates and designs not listed below

Range

(m3/min)

Throat Pressure
(kPa)

Inlet Diameter
(mm)

Outlet Diameter
(mm)

Length

(mm)

Material

1.1 - 11

2.5

190.5

101.6

330.2

Aluminum

1.7 - 17

2.5

228.6

101.6

406.4

Aluminum

2.3 - 23

2.5

254

152.4

482.6

Aluminum

3.0 - 30

2.5

254

152.4

508

Aluminum

4.2 - 42

14.9

228.6

152.4

508

Aluminum

6.4 - 64

5.0

335.6

203.2

635

Aluminum

5.7 - 57

14.9

279.4

152.4

508

Aluminum

8.5 - 85

14.9

330.2

203.2

635

Aluminum

1.1 - 11

6.7

152.4

101.6

330.2

304 SS

4.2 - 42

6.7

254

152.4

508

304 SS

8.5 - 85

6.7

330.2

215.9

660.4

304 SS

9.9 - 99

6.7

381

304.8

939.8

304 SS

 

 

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