| Device Uncertainty | 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 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 | DN50: 3 pcs | DN65, DN80: 2 pcs | DN100, DN150, DN200: 1 pc | |||
| Water Pump | 1 pc: H=30 m, Q=1 m³/h, P=0.5 kW 1 pc: H=30 m, Q=40 m³/h, P=7.5 kW 1 pc: H=35 m, Q=200 m³/h, P=30 kW 1 pc: H=30 m, Q=600 m³/h, P=75 kW | |||
| Water Tank | 45 m³ | |||
| Commutator | DN25, DN50, DN100, DN200 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 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 | 3 sets of mobile phones with 40 MP resolution, 8G/128G storage | |||
| Standard Device | Volumetric Method + Master Meter Method | |||
| Flow Range | （0.010-630）m³/h | |||
| Calibration Method | Start‑stop method | Diversion method | Flow–Time Method | QTY |
| Electromagnetic Flow Meter Instantaneous Flow Display Advanced (Class 0.5) | DN10:20-500L/H | 1 | ||
| DN40:2260-22600L/H | 1 | |||
| DN100 10-200m³/H | 1 | |||
| DN200 56.55-630m³/H | 1 | |||
| Electromagnetic Flow Meter Standard Meter Standard (Class 0.2–0.3) | DN10:20-500L/H | 1 | ||
| DN40:2260-22600L/H | 1 | |||
| DN100 10-200m³/H | 1 | |||
| DN200 56.55-630m³/H | 1 | |||
| Volumetric Vessel Volumetric Method Standard | 50L-100L | 1 | ||
| 1000L-2000L | 1 | |||
| 5000L-10000L | 1 | |||