Description

The BP250 Bell Prover is a primary standard for flow calibration with air. The cylindrical, top-closed hollow body (bell cylinder) is lowered to produce a flow. The flow rate is attributed to the SI units of length and time. The system is based on a proven technology by the PTB which is used worldwide in national metrology institutes for calibration of nozzles and other standards.

Technical Data
Measurement 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)
Measurement period t ≥ 20s
Operating pressure 1100 Pa
Bell diameter 1400 mm
Stroke 1650 mm
Volume approx. 2.5 m3