Multi 3410 Operation
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ba75863y18 01/2015
Calibration standards Calibrate with 1 to 3 turbidity standard solutions. The standard solu-
tions must be selected in the following order.
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.
Example:
If you expect turbidity values in the range 200 ... 4000 FNU/NTU, you
have to carry out a 3-point calibration.
The measurement precision is also dependent on the selected stan-
dard solutions. Therefore, the selected standard solutions should cover
the value range expected of the turbidity measurement.
If the measured turbidity is outside the measurement range, OFL is dis-
played.
Standard solution Range (FNU/NTU)
1 0.0 ... 1.0
2 5.0 ... 200.0
3 200.0 ... 4000.0
As the standard with turbidity value 0.0 FNU you can use
clean tap water or filtered, deionized water in a suitable cal-
ibration vessel, depending on the required quality (see sec-
tion 4.10.1). 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“.
Standards with turbidity values for the calibration ranges 2
and 3 are available as accessories (see price list of the
WTW catalog "Lab and field instrumentation“). Calibration
can be carried out in the bottles the standards are deliv-
ered 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.
1 Perform the preparatory activities according to section 4.10.1.
2 Connect the turbidity sensor to the measuring instrument.
The turbidity measuring screen is displayed.
3 Keep the standard solutions ready in suitable calibration ves-
sels.
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