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Precision Dual-ball Rotameters
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Rotameters are variable area flowmeters that provide field accuracy in an easy-to-read instrument. The principle of operation is simple: air flow passes through a vertical, tapered tube and pushes a ball or float having a diameter slightly less than the smaller tube end. As the ball rises, the clearance between the ball and the tube wall increases. The ball becomes stationary when the diameter of the tube is large enough to allow the total air flow past the ball. The flow rate is determined by noting the engraved scale on the tube at the position of the stabilized ball. |
An important feature of the SKC dual ball rotameter is the use of two float balls: a light (black ball) for indicating low flows and a heavy (white ball) for indicating high flows. The black ball is read until it is off scale, then the white ball is read.
Two float balls give the broadest flow ranges with the highest accuracy possible in a single rotameter. The two balls give an effective reading scale length of approximately 12 inches in a shorter rotameter.
Note: Low flow rotameters can only be used with pulsation-free pumps.
About Rotameters
Rotameters and other flow-meters, such as wet test meters and dry gas meters,
are termed secondary standards. Secondary standards can be used to obtain accurate,
reliable measurements of pump flow rate if their calibration can be traced to
a primary standard and they are handled with reasonable care.
Ordering Information Online
Ordering
| Measuring Range (ml/min) | Cat. No. |
| 235 to 2350 and 500 to 5000 |
320-235-4600 |
| 4 to 49 and 24.5 to 245 |
320-5-245 |
| 5 to 5000 | 320-5-4600 |
Features
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About Field Rotameters
These small and lightweight, single ball rotameters represent a new and durable
design of portable air flowmeters. SKC Field Rotameters are crafted of see-through
acrylic with tapered hose connectors attached to solid brass fittings. A removable
section of Tygon® tubing with a Luer taper adapter is included.
A float ball is clearly visible behind decaled graduations on the rectangular
face. The easy-to-read scales are ideal for performing routine verifications
of air flow easily in the field with reproducible results.
Ordering Information Online
Ordering
| Measuring Range (L/min) | Scale |
Full Scale Accuracy |
Cat. No. |
| 0.05 to 0.5 | 2 |
± 5% |
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| 0.1 to 1.0 | 4 |
± 3% |
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| 0.4 to 5.0 | 4 |
± 3% |
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| 4 to 20 | 4 |
± 3% |
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| 4 to 50 | 4 |
± 3% |
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| 5 to 30 | 4 |
± 3% |
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| 3 to 30 | 4 |
± 3% |
320-100 |
| | Fitting adapted for use with QuickTake Sample Pumps |
Field
Rotameter Spec. Sheet (PDF)
Field
Rotameter Operating Instructions (PDF)
Instrucciones
de Operación
Catálogo No. 320 Series (PDF)
| The ball-type flowmeters and rotameters built into most air sampling
pumps are primarily intended to serve as flow indicators and are, therefore,
of low accuracy. These flowmeters as well as rotameters must be calibrated
against a primary standard such as a film flowmeter or electronic calibrator
(Defender) to verify accuracy. | |||||||||||||||||||
When using a rotameter at a different temperature and pressure than
when it was calibrated, the following formula can be used to calibrate
the new flow rate:![]()
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