| Device Uncertainty |
Urel≤0.2%(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 a 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 | DN32/40/50: 1 pc | Vertical water meters (DN15/DN20/DN25): 6 pcs | Vertical water meter (DN32): 2 pcs | Vertical water meter (DN40): 2 pcs | Vertical water meter (DN50): 1 pc |
| Water Pump |
1 × Nanfang CHM10‑50 (flow rate: 8 m³/h, head: 48 m); 1 × TD50‑40G/2 (flow rate: 50 m³/h, head: 30 m) |
| Water Tank |
2000 L |
| Commutator |
DN25 & DN50 cross‑fork pneumatic open commutator; low noise, high sensitivity; travel difference 0 ms; uncertainty within 0.002% |
| Meter Clamping Mechanism |
Dual‑cylinder outward‑push series pneumatic clamping mechanism; single pneumatic clamps for front 10 and rear 5 positions |
| 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 signal, f = (0–10) kHz |
| Vacuum System |
Differential pressure vacuum generator; vacuum water filling to keep water meters fully filled |
| Supported Operation Modes |
Fully automatic, semi‑automatic, touchscreen manual operation |
| Acquisition Equipment |
10 sets of mobile phones with ≥ 40‑megapixel resolution |
| Standard Device |
Piston + Mass + Master Meter Method |
| Flow Range |
(0.003-40)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 |
| DN50:8000-40000L/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 |
| DN50:8000-40000L/H |
1 |
Electronic Scale Mass Method Standard |
①Max=30kg,6000e |
1 |
| ②Max=600kg,6000e |
1 |