|Field Rotameters are simple-to-read secondary standards used for obtaining accurate, reliable measurements of pump flow rates when calibrated to a primary standard. Multiple flow ranges allow the user to choose the appropriate range for calibration.|
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.
Rotameters and other flowmeters, 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 rates if they are calibrated to a primary
standard on a regular basis, typically monthly.
| 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: