Thermo Fisher Scientific CyberScan CON 400 (For units manufactured from March 2010 onwards) - Manual (Page 18)

Instruction Manual CON 400
- 12 -
4.5 TDS Calibration
4.5.1 Calibrating for TDS directly
The factory default setting for the TDS conversion factor is
0.50. If your solution has a different TDS factor, you can
improve calibration accuracy by setting the TDS factor prior to
calibration. See page 33 for directions.
1.
If necessary, press the MODE key to select TDS mode.
2. Rinse the probe thoroughly with DI water or a rinse
solution, then rinse with a small amount of calibration
standard.
3. With the yellow probe guard attached, dip the probe into
the calibration standard. Immerse the probe tip beyond
the upper steel band. Stir the probe gently to create a
homogeneous sample. Allow time for the reading to
stabilise.
4. Press CAL/MEAS to enter TDS calibration mode. The
CAL indicator will appear in the upper right corner of the
display.
5. Press the MI/S or MR/T to change the value on the
primary display to match the value of the calibration
standard referenced to your normalisation temperature
(usually 25
°C).
6. Press ENTER to confirm the calibration value. The meter
returns to the MEAS (measurement) mode.
7. Repeat steps 1 to 6 for other measuring ranges.
NOTES
To exit from TDS Calibration mode without confirming
calibration, DO NOT press the ENTER key in step 6. Press
CAL/MEAS instead. This will retain the meter’s old calibration
data in the measuring range of the calibration.
You can offset the TDS reading up to ±40% from the default
setting. If your measured value differs by more than ±40%,
clean or replace probe as needed.
The minimum offset reading allowable is limited to 10% of full scale reading of the range you
are working in. The maximum offset reading allowed is the range full scale reading
Eutech Instruments/ Oakton Instruments offer a wide selection of high-quality calibration
standards. See page 44 for more information.
Figure 8 - TDS Calibration