| 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 | DN40 / DN50 / DN65: 5 pcs | DN80 / DN100: 3 pcs | |||
| Water Pump | 1 pc: H=20 m, Q=2 m³/h, P=0.5 kW; 1 pc: H=30 m, Q=40 m³/h, P=7.5 kW; 1 pc: H=30 m, Q=180 m³/h, P=22 kW | |||
| Water Tank | 15000 L | |||
| Commutator | DN25 & DN100 cross‑fork pneumatic open commutator, low noise and 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 for vacuum water filling to keep water meters fully filled | |||
| Supported Operation Modes | Fully automatic, semi‑automatic, touchscreen manual operation | |||
| Acquisition Equipment | 5 sets of mobile phones with 50 MP resolution, 8G / 128G storage | |||
| Standard Device | Mass Method + Master Meter Method | |||
| Flow Range | （0.010-130）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 | |||
| DN100 10-200m³/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 | |||
| DN100 10-200m³/H | 1 | |||
| Electronic Scale Mass Method Standard | ①Max=30kg，6000e | 1 | ||
| ②Max=150kg，15000d | 1 | |||
| ③Max=3000kg，15000D | 1 | |||
| Thermostat Standard for Heat Meter Calibration Device | ||||
| Standard Platinum Resistance Thermometer | Class 2 | |||
| Digital Meter | WZPB-2 6½-digit digital meter for temperature acquisition | |||
| High Temperature Thermostatic Bath | WL-L1A (High Temp. Bath) Measuring range: (4 – 95) ℃ Max. working temperature difference: 0.03 ℃ Average temperature difference: 0.015 ℃ | |||
| Low Temperature Thermostatic Bath | WL-L1B (Low Temp. Bath) Measuring range: (room temperature – 95) ℃ Max. working temperature difference: 0.03 ℃ Average temperature difference: 0.015 ℃ | |||
| Heating Device | Customized according to the water tank size. | |||