YSI VisoTurb 700 IQ - Manual (Page 14)

Commissioning VisoTurb
®
700 IQ (SW)
3 - 2 ba76039e01 01/2012
3.2.2 Flow direction
As a general rule, the sapphire disc should be positioned clearly
against the current in flowing media (angle of attack approx. 20 to 45 °).
Exception: If there are high quantities of foreign bodies with fibrous or
large surfaces, as for example hairs, strings or leaves, it may be of
advantage to incline the sensor in the direction of the flow so that the
sapphire disc does not face the flow.
3.2.3 Sensor angle
Fig. 3-1 Effect of the sensor angle on scattering and reflection from the ground and
walls
Note
Scattering and reflection are lowest at a sensor angle of 45° and at a
minimum distance of 10 cm to the ground and walls (see section 3.2.5).
Note
At a sensor angle of 45°, keep a minimum distance of 50 cm in the
direction of the infrared beam.
0 ° 20 ° 45 °
10 cm
50 cm
Marking