Turbidity
MIQ/IDS
48
ba77277d01
01/2024
The turbidity expected in the measurement dictates the number and selection of
the standards. Calibration has to be carried out for the range with the highest
turbidity to be expected and for all lower ranges. The standard solutions for this
have to be selected in ascending order, starting with standard 1.
The measurement precision is also dependent on the selected standard solu-
tions. Therefore, the selected standard solutions should cover the value range
expected of the turbidity measurement.
9.2.3 Calibration procedure on the IQ S
ENSOR
N
ET
In general, a calibration procedure is carried out as follows on the
IQ S
ENSOR
N
ET
. For system specific details, please refer to the IQ S
ENSOR
N
ET
system operating manual.
As the standard with turbidity value 0.0 FNU you can use clean tap
water or filtered, deionized water in a suitable calibration vessel,
depending on the required quality (see operating manual of the
sensor VisoTurb
®
900-P). This standard should be freshly
prepared prior to every calibration. Suitable bottles are listed in the
price list of the WTW catalog "Lab and field instrumentation".
The standards with turbidity values for the calibration ranges 2 and
3 are available as accessories. Calibration can be carried out in the
bottles the standards are delivered in. The standards can be used
several times within their shelf life.
Replace the standards solutions if you have any doubts concerning
their quality or after the expiration date.
Prepare the calibration standards.
Step 1:
The sensor is in the sample.
The procedure is started from the measured value display with
<C> (see IQ S
ENSOR
N
ET
system operating manual).
During the check, the sensor is in maintenance condition.
All linked outputs remain in their current status.
When operating the sensor in a flow through armature:
Remove the sensor from the flow armature.
Step 2:
Calibration
Follow the instructions on the display.