Averaging Pitot Tube Flow Sensor — BF10
BF10 averaging pitot tube combines a low-pressure-loss DP principle with an insertion style. The aerodynamic water-drop (teardrop) section minimizes drag, multiple tapping ports sense the true average velocity, and total pressure loss is only ~3% of the measured ΔP (vs. 60% for an orifice plate). Built as a one-piece monolithic metal cavity — ideal for large lines and online installation.
Specifications
| Accuracy | ±0.5 |
| Repeatability | 0.15 |
| Turndown | >10:1 (050 type up to 65:1) |
| Pressure loss | ~3% of measured ΔP |
| Media | Gas, steam, liquid |
| Installation | Insertion; online install and cleaning |
| Fluid coefficient | Constant over a wide range, linear K |
Details
Working Principle
Follows the Bernoulli equation: Qv = K × C × √ΔP. The sensor creates a high-pressure zone upstream (above line static pressure) and a low-pressure zone downstream as the fluid accelerates past it. The difference is the DP signal. High and low tapping holes are arranged on the pipe axis via multiple ports, so the measured pressure difference reflects the area-averaged velocity.
Key Features
- Water-drop section: minimal drag, fixed separation point; flow measurement ceiling raised by ≥35%
- One-piece monolithic cavity: no inter-chamber leakage, higher strength, no breakage risk
- Anti-blocking: upstream high-pressure zone keeps particles out; low-pressure ports sit before the separation point with asymmetric arrangement options; a turbulence-generating (STG) surface plus silt grooves keeps the boundary layer turbulent
- Constant fluid coefficient: linear K, unaffected by Reynolds number or area ratio
- Low permanent loss (~3% of ΔP) and essentially maintenance-free
- Online installable variant for service without shutdown
Special Variants
BF10-050 加速式平衡均速管：accelerator tube + balancer + averaging pitot in one, 65:1 turndown, no straight-run needed, ±0.5% accuracy at low velocity. BF10-510CL 自清洗型：blow-out cleaning ports allow online purge of dirty media. BF10-601/602 高粉尘微颗粒型：inclined bottom openings prevent plugging. 高温一体化系列：self-cooling integrated water/gas separation block replaces impulse lines and condensers for high-temperature media (≤350 °C, ≤ANSI300).