Thermo Fisher Scientific EcoScan CON 6 & TDS 6 - Manual (Page 18)

Instruction Manual CON 6/TDS 6
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4.2 Preparing the Meter for Calibration
Before starting calibration, make sure you are in the correct measurement
mode.
For best results, select a standard value close to the sample value you are
measuring. Alternatively use a calibration solution value that is approximately
2/3 the full-scale value of the measurement range you plan to use. For
example, in the 0 to 2000 µS conductivity range, use a 1413 µS solution for
calibration.
Calibrate to all measurement ranges to ensure the highest accuracy throughout
all measurement range. Note that CON 6/ TDS 6 will not accept calibration
values of less than 2µS/cm during the multi-point calibration process. All new
calibration values will automatically override existing data.
If you are measuring in solutions with Conductivity lower than 100 µS/cm or
TDS lower than 50 ppm, calibrate the meter at least once a week to get good
accuracy. If you are measuring in the mid ranges and you wash the probe in
deionized water and store it dry, calibrate the meter once a month. If you take
measurements at extreme temperatures, calibrate at least once a week.
Ensure that you use new Conductivity standard solutions or sachets during
calibration. Do not reuse standard solutions as it may be contaminated and
affect the calibration and accuracy of measurements. Use fresh calibration
solution each time you calibrate your meter. Store solutions in a dry and cool
environment if possible.
Always rinse the probe with either deionized water or rinse solution before and
after each calibration/sample measurement to avoid cross-contamination. For
details please refer to Section 7 - Probe Care and Maintenance.
NOTE: These meters are factory set to a temperature
coefficient of 2.1% per °C. For most applications
this will provide good results.
To set the temperature coefficient to different value,
see Section 6.5 – Temperature Coefficient.
Also, see Addendum 3 - Calculating Temperature
Coefficient to determine the appropriate
temperature coefficient for your solution.