| Nominal Diameter (DN) | 25 mm |
| Meter Type | Ultrasonic |
| Measuring Principle | Transit-time difference of ultrasonic signals |
| Accuracy Class | Class 2 |
| Nominal Flow Rate (Q₃) | 4 m³/h |
| Overload Flow Rate (Q₄) | 5 m³/h |
| Transitional Flow Rate (Q₂) | 0.02 m³/h |
| Minimum Flow Rate (Q₁) | 0.01 m³/h |
| R Ratio (Q₃/Q₁) | R400 |
| Maximum Permissible Error (MPE) | ±2% (Q₂ ≤ Q ≤ Q₄), ±5% (Q₁ ≤ Q < Q₂) |
| Pressure Class | MAP16 |
| Maximum Operating Pressure | 1.6 MPa (16 bar) |
| Pressure Loss Class | ΔP63 |
| Temperature Class | T50 (up to 50°C) |
| Maximum Permissible Temperature | 50°C |
| Nominal Pressure Loss at Q₃ | ≤ 0.063 MPa (63 kPa) |
| Nominal Pipe Connection | BSP Threaded or Sealant (as per model) |
| Mounting Orientation | Horizontal (H) |
| Direction of Flow | Forward (arrow marked on body) |
| Flow Profile Sensitivity | U₀/D₀ = 0 / 0 (not affected by upstream/downstream disturbances) |
| Length of Upstream Straight Pipe | 10D |
| Length of Downstream Straight Pipe | 5D |
| Verification Scale Interval (VSI) | 0.1 Litre |
| Meter Body Material | CPVC / UPVC |
| Transducer Housing | Encapsulated Ultrasonic Sensor Pair |
| Display Unit Position | Top of Meter |
| Ingress Protection | IP68 |
| Ambient Temperature Range | 5°C to 80°C (as per model) |
| Storage Temperature Range | -25°C to +70°C |
| Reference Standards | ISO 4064-1:2014, ISO 4064-2:2014 |
| Typical Application | Cold potable water measurement for domestic and commercial usage |