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Novomatics Manual
Turbitronic P
11.
Calibration of relevant parameters
11.1. Temperature calibration
In the Turbitronic P a powerful microprocessor system is installed for the control of all
instrument functions. The wireless temperature probe is used to convert the analogue inputs of
the platinum sensor into a digital signal which is transferred to the Turbitronic P. The wireless
temperature probe uses internal references for long term stability. In case of any error "----" is
shown on front panel display. A manual calibration is not required.
11.2. Rotation speed calibration
The speed of the magnetic stirring rod in the test tube is controlled by rotation of a strong
permanent magnet. It is driven by a microprocessor controlled motor. The revolving speed is
displayed on front panel. If a stirring speed is set within the Stop Conditions the magnetic
stirring rod turns already before inserted completely into the measuring chamber. This effect
allows the check of stirring function manually.
11.3. Time calibration
Due to the high accuracy of the built-in real time clock, there will be no short term deviations in
the timing functions.
11.4. Turbidity calibration
At start of the test it auto calibration of turbidity is performed, It is assumed the sample has 0
NTU at the start temperature. Further changes in turbidity are related to that. Please make sure
that your sample has really no turbidity at start, if not cool it down till it is completely clear.
The Turbitronic P expresses turbidity in Nephelometric Turbidity Units [NTU]. The value of the
Nephelometric Turbidity Units is calculated by the light transfer through the samples and follows
a non-linear relationship. That's why the instrument has to be calibrated with three standards.
The Turbitronic P already factory calibrated but the calibration can be approved or re-newed
anytime.
For that purpose prepare three calibration standards according chapter "12. Turbidity calibration
standards" and keep them ready for insertion into the instrument. Please note the three
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