| Part No. | Line size Nominal flow rate |
Accuracy (1% MW + 0.5% MEW)* | Repeatability | ||
|---|---|---|---|---|---|
| 10% of max flow | 50% of max flow | 100% of max flow | |||
| SU8x21 |
1" NPT/ G1 0.25...63.40 gpm |
+/- 0.38 gpm +/- 1.44 lpm |
+/-0.63 gpm +/- 2.40 lpm |
+/- 0.95 gpm +/- 3.60 lpm |
+/- 0.13 gpm +/- 0.48 lpm |
| SU2x21 |
2" NPT/ G2 1.32...264.18 gpm |
+/- 1.59 gpm +/- 6.0 lpm |
+/- 2.64 gpm +/- 10.0 lpm |
+/- 3.96 gpm +/- 15.0 lpm |
+/- 0.53 gpm +/- 2.0 lpm |
Note: Performance specifications of the ultrasonic flow meter are true across the full temperature rating of -4...212°F (-20...100°C).
* MW = measured flow rate; MEW = full range flow rate
Most of ifm’s flow meters use a two-part accuracy calculation, based on the measured flow rate (MW) and full range of the meter (MEW). For example, accuracy of the SU8621 (MEW = 63.40 gpm) is specified as:
± (1 % MW + 0.5% MEW)
For MW = 50 gpm, accuracy = ± (0.01*50 + 0.005*63.40) = +/- 0.817 gpm
The repeatability calculation is consistent over the entire flow measuring range of the unit. For example, repeatability of the SU8621 (MEW = 63.40) is specified as:
± (0.2% MEW)
repeatability = +/- (0.002*63.40) = +/- 0.1268 gpm