XiLog+ waste water sensors

The new XiLog+ 2W data logger extends the XiLog+ range for use with more sensors on waste water networks. Applications include permanent monitoring of storm weirs, sewer overflows, network modelling and influence of rainfall and industrial discharges to networks.

Open channel flow using Doppler sensor

The Doppler method uses a continuous, ultrasonic signal sent into the water at a known angle to measure the flow velocity. Moving particles generate a frequency shift proportional to the velocity of the particles

• • One sensor for Doppler measurement + piezoresistive pressure (depth) measurement +temperature compensation
  • Wedge sensor for mounting on channel bottom
  • For use in slightly to heavily polluted water
  • Flow velocity range; ±600 cm/sec
  • Level range; 0 – 350 cm

Level measurement using ultrasonic sensor

Ultrasonic pulses are reflected by the surface and received at the sensor. A common application is for depth v flow-rate determination on weirs and flumes.

• • Typical application is for monitoring sewer overflows at times of excessive rainfall when sewerage may be discharged into the environment
  •  Range up to 3 metres
  •  Deviation; ±4 mm or <0.2%
  •  4-20mA interface to logger

Level measurement using radar sensor

Sensor uses pulsed microwaves enabling high accuracy over a wide range. Furthermore, it is not affected by humidity, surface foam, etc., creating false echoes.

• • Accuracy; ± 2 mm (of reading)
  • One device covers wide range (up to 15 metres)
  • No dead-band under sensor (ultrasonic 250mm deadband, 6m range)
  • Not affected by temperature, humidity, surface foam, dust and air movements
  • Low maintenance costs
  • No drift and no recalibration

Overflow sensor

The overflow sensor is self-powered and, when submerged, indicates presence of water. The system measures the time an overflow occurs, e.g. over a weir. Installation of the sensor is made in the required position to detect an overflow. The sensor has a designed profile to avoid sediment build up.