| Device Uncertainty |
Urel≤0.05%(k=2) Urel≤0.05%(k=2) |
| Flow Stability |
1.0% for start‑stop method; 0.2% for other methods |
| Test Medium |
Purified tap water |
| Operating Humidity |
≤ 93% RH |
| Operating Water Temperature |
20 ℃ ± 10 ℃ |
| Water Temperature Fluctuation in Single Measurement |
Water temperature fluctuation in single measurement |
| Water Fluctuation Coefficient per Cycle |
≤ ± 0.1% |
| Water Source Working Pressure |
0.0–0.5 MPa (adjustable) |
| Air Source Working Pressure |
0.4–0.7 MPa |
| Device Operating Temperature |
4–50 ℃ |
| Number of Meters Under Test |
DN15: 10 pcs | DN20: 8 pcs | DN25: 6 pcs | Vertical water meters DN15、DN20、DN25: 6 pcs |
| Water Pump |
Nanfang CHM10‑50; flow rate 8 m³/h, head 48 m,1pc |
| Water Tank |
800 L |
| Commutator |
DN25 cross‑fork pneumatic open commutator; low noise, high sensitivity; travel difference < 10 ms; uncertainty within 0.002% |
| Meter Clamping Mechanism |
Dual‑cylinder outward‑push series‑connected pneumatic clamps; 10 front & 5 rear with single pneumatic clamps |
| Water Meter Seal Test |
Pressure range (0–2.0) MPa |
| Bore Diameter |
Φ50 mm, telescopic stroke ≥ 80 mm |
| Timer |
(10–100) kHz (adjustable); better than 10⁻⁶ |
| Calibration Signal |
Pulse, f = (0–10) kHz |
| Vacuum System |
Differential pressure vacuum generator; vacuum water filling to keep meters fully filled |
| Supported Operation Modes |
Fully automatic, semi‑automatic, touchscreen pure manual |
| Acquisition Equipment |
16 sets of mobile phones with ≥ 40‑megapixel resolution |
| Standard Device |
Volumetric Method + Master Meter Method |
| Flow Range |
(0.010-8)m³/h |
| Calibration Method |
Start‑stop method |
Diversion method |
Flow–Time Method |
QTY |
Electromagnetic Flow Meter Instantaneous Flow Display Advanced (Class 0.5) |
DN2:3-90L/H |
1 |
| DN10:20-500L/H |
1 |
| DN25:500-800L/H |
1 |
Electromagnetic Flow Meter Standard Meter Standard (Class 0.2–0.3) |
DN2:3-90L/H |
1 |
| DN10:20-500L/H |
1 |
| DN25:500-800L/H |
1 |
Volumetric Vessel Volumetric Method Standard |
10L-20L |
1 |
| 50L-105L |
1 |