Reading the flow rate
Before taking a reading ensure that the rotameter is positioned on a level surface.
The reading is taken from the top level of the float. The operator should read the scale at eye level, not from above or below, to ensure the accuracy is maximized.
The accuracy of rotameters is impacted if the float is not steady. Ensure that the float is spinning freely and is not oscillating up and down before taking a reading.
Optional accessories
717-511 - Tubing adapter for small sample tubes. Enables leak free connection of small diameter sorbent tubes to the rotameter.
Accuracy specification
The 393-002025 model rotameter has the following accuracy specification - ±2.5% of full scale. Accuracy values expressed as percentage of reading for the major scale flow rates for the 393-002025 model rotameter are given in the table below:
| Flow Rate(ml/min) | Accuracy (% of reading |
| 250 | 2.50 |
| 200 | 3.12 |
| 150 | 4.17 |
| 100 | 6.25 |
| 50 | 12.50 |
| 20 | 31.25 |