General description
KARAT-520 is an ultrasonic flow meter intended for water consumption measurement. The flow meter has been developed on the basis of KARAT experience in ultrasonic meters production since 1994.
KARAT-520 is also suited for consumption measurement in apartment and commercial buildings. The volume is measured using ultrasonic technique, which is proven as a long-term stable and accurate measuring principle. Two ultrasonic transducers are used to send sound signals both against and with the flow. The ultrasonic signal travelling with the flow reaches the opposite transducer first. The time difference between the two signals can be converted into flow velocity and subsequently volume.
Ultrasonic flow measurement guarantees long life. The meter has no moving parts, meaning that there is no wear and that the meter is resistant to any impurities in water.
KARAT-520 is powered by internal lithium battery, providing more than 5 years’ lifetime.
Mechanical data
| Ambient temperature | 1…150 °C |
| Protection class | IP65 |
| Storage temperature | -25…50 °C |
| Pressure stage | PN16 |
Meter data
| Metrological class | 2 |
| Accuracy: Q1 ≤ Q < Q2 Q2 ≤ Q ≤ Q4 | ± 2 % ± 1 % |
Electrical data
| Battery | 3.6 VDC, one C cell lithium |
| Battery lifetime | more than 4 years |
| External power supply | 12…24 VDC (option) |
| Type name |
Nominal flow, m³/h [Q3] |
Minimum flow, m³/h [Q1 ] |
Maximum flow, m³/h [Q4 ] |
Dynamic range Q3/Q1 | Min. cut-off, l/h | Length, mm |
| KARAT-520-20 | 2.5 | 0.025 | 5.0 | 100 | 13 | 190 |
| KARAT-520-25 | 3.5 | 0.035 | 7.0 | 100 | 18 | 260 |
| KARAT-520-32 | 6.0 | 0.060 | 12.0 | 100 | 30 | 260 |
| KARAT-520-40 | 10.0 | 0.100 | 20.0 | 100 | 50 | 300 |
| KARAT-520-50 | 15.0 | 0.150 | 30.0 | 100 | 75 | 300 |
| KARAT-520-50 | 40.0 | 0.400 | 80.0 | 100 | 200 | 300 |