Xylem wtw Multi 3630 IDS - Page 63

Multi 3630 IDS Turbidity measurement (VisoTurb
®
900-P)
ba77170e03 10/2017 63
9 Turbidity measurement (VisoTurb
®
900-P)
9.1 Measuring
9.1.1 Measuring the turbidity
Preparatory
activities
Perform the following preparatory activities when you want to measure:
 Avoid gas bubbles (e.g. air bubbles) in the test sample.
 Use suitable vessels for measurement and calibration
(see operating manual of the VisoTurb
®
900-P sensor).
 Heed the minimum depth of immersion for the sensor
Measuring You can carry out turbidity measurements as follows:
The sensor connection and the USB-B (device) interface are gal-
vanically insulated. This facilitates interference-free measurements
also in the following cases:
 Measurement in grounded test samples
 Measurement with several sensors connected to one
Multi 3630 IDS in one test sample
1 Connect a turbidity sensor to the measuring instrument.
The turbidity measuring screen is displayed.
The data for the connected IDS turbidity sensor are automatically taken
over.
2 Fill the test sample into a lightproof measuring beaker up to a level of
at least 6 cm.
3 When immersing the sensor in the test sample, hold the sensor at an
angle.
4 For measuring, position the sensor upright.
5 Position the sensor in a way that meets the following requirements.
 Distance to the bottom: 6 cm
 Distance to the walls of the beaker: 2 cm
 Minimum depth of immersion: 2 cm
To position the sensor optimally and permanently while it is mea-
suring, fix it on a support.
1 Perform the preparatory activities.