Sartorius DCU 3, Operator'S Handbook Manual

Page: 28 / 150

Operators Handbook DCU3 – System
5., Main Function „Calibration“
BAEDCU3 - Rev. 4.6 - 0504 5 - 6
5.5 Calibration of Turbidimetry Measurement
Calibration of the turbimetry measurement probe is a „single-step“ procedure evalulating the „zero de-
viation“ of the sensor is. For this the sensor is placed into particle- and bubble-free deinonized water.
The system calculates the turbidimetry as the arithmetical mean of the value measured during a de-
fined measuring time in terms of „absorption units, AU“. For calculation the system considers the zero
deviation and a selectable damping factor „DAMP”. To obtain stable turbidimetry measurements, the
damping factor „DAMP“ can be selected in 4 stages.
The operating display of the turbidimetry sensor includes the data field for absorption units (AU), the
percentage sensor raw signal [%] and the zero deviation against „0 AU“. This allows for an easy func-
tional check of the sensor. The lamp contained in the turbidimetry sensor can be switched on and off
via the „Sensor Calibration“ - menu, see LAMP-entry
1)
.
5.5.1 Operating Display
Tag Entry Displayed value or function, required input
TURB AU Display of process value in 0...6 AU (Absorbing Units)
ELEC % Display of percentage raw signal of the sensor
ZERO % Display of zero deviation after calibration
LAMP
1)
On/off Display and selection of switching state of lamp in the sensor
DAMP 1 ... 4 Display and input of signal damping. The input signal is proc-
essed as the mean value of a floating reference window.
Damping factors base upon 4 selectable reference windows:
- step 1 = 6 s; step 2 = 12 s; step 3 = 30 s; step 4 = 60 s
Start Calibration Enabling the calibration routine
Additional touch keys, values and functions available in this display:
BUFFZ AU Display of zero solution
1)
Only Fundalux I – system, not applied with Fundalux II (available as option from 2004 on)