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Q-Sewage - Flowmeter Systems for Waste Water
+ 12 sensors + added relais control: Path lengths: 0,8 to 10 meters. Number of maximal connectable sensors: 12. Measurement range: -10 to +10 m/s. Accuracy v: < 0,1% in measuring circuit. Accuracy Q: < 1%. Frequency: 200 kHz, explosion proofness. Housing: 330 x 235 x 190 (W x H x D), compact housing IP 65. Remote control. Remote data transfer: optional analog, ISDN, GSM, GPRS. Outputs: optional USB, Bluetooth, WLAN. Power supply: 12 - 36 VDC. Power consumption: 11 VA at continous operation, < 1 VA at standby mode.
- 3-level single path system, measurement in waste water
At least two ultrasonic transducers are installed so that acoustic signals transmitted between them run diagonally to the flow.
The acoustic signal running against the flow has a longer travel time than the acoustic signal running with the flow. The difference in travel times is directly proportional to the flow velocity and, when the cross section is known, directly pro- portional to the discharge.
Single path system
For irrotational flows the single level configuration is recommended. Similar to the simplest river configuration, the measurement path is adjusted diagonally to the flow.
Cross path system
In open channel flows sewers superimposed by secondary flows the crossed path configuration is recommended to measure the discharge exactly. With the known water level the discharge can be recorded continuously even when secondary flows exist in the cross-section.
Multiple level system
If the water level is prone to extreme fluctuations, the accuracy of the measurement can be improved with the installation of multiple levels. In multiple level measurements, the vertical velocity distribution found in the cross-section can be measured directly and the after installation calibration becomes unnecessary.