BP Bell Prover
Calibration and transfer standard with highest accuracy
The gas measuring bells provide a primary standard for flow calibration with air. The system is based on a technology of the PTB (Physikalisch-Technische Bundesanstalt, Braunschweig) which has been proven for many years and is used worldwide in national metrology institutes for the calibration of nozzles and other standards such as gas meters, differential pressure transmitters etc.
Technical data
BP100 – Bell Prover, System PTB
| Flow range | 0,4..100 m³/h |
| Measurement uncertainty (1 m³/h…65 m³/h) | Version A: ≤ 0.06% (k=2) Version B: ≤ 0.15% (k=2) |
| Measuring times | t ≥ 20 s |
| Operating pressure | 1100 Pa |
BP250 – Bell Prover, System PTB
| Flow range | 1…250 m³/h |
| Measurement uncertainty (2.5 m³/h…160 m³/h) | Version A: ≤ 0.06% (k=2) Version B: ≤ 0.15% (k=2) |
| Measuring time | t ≥ 20 s |
| Operating pressure | 1100 Pa |
Measuring principle
Generates a flow into a standing vessel filled with barrier liquid and displaces the enclosed air volume. Depending on the sinking speed of the bell, a volume flow is generated, which in turn can be traced back to the SI units length and time.
Features
- Measurement uncertainties up to 0.06% (k=2)
- Direct calibration of sonic nozzles and other flow adjusting test items
- Infinitely adjustable volume flow
If you have any questions, please do not hesitate to contact our EP-E service team.