Thermo Fisher Scientific CyberScan PC 300 User Manual
Page 15
Instruction Manual PC 300
11
4.4 Conductivity
Calibration
The PC 300 meter has five measuring ranges. You can calibrate one point in each of the
measuring ranges (up to five points). If you are measuring values in more than one range,
make sure to calibrate each of the ranges you are measuring. All new calibration data will
over-ride existing stored calibration data for each measuring range you calibrate.
•
If you are measuring in ranges near to or greater than 20 mS (10 ppt), or
near to or lower than 100
μS (50 ppm), calibrate the meter at least once
a week to get specified ±1% F.S. accuracy.
•
If you are measuring in the mid ranges and you washed the probe in
deionized water and stored it dry, calibrate the meter at least once a
month.
•
If you take measurements at extreme temperatures, calibrate the meter
at least once a week.
Preparing for conductivity calibration
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 1999
μS conductivity range,
use a 1413
μS solution for calibration.
Table 1 - Range Indicator and its corresponding ranges
Range
indicator
Conductivity
Range
Recommended Calibration
Solution Range
TDS Range
Recommended Calibration
Solution Range
r 1
0.00 Æ 19.99
μS
6.00 to 17.00
μS
0.00 Æ 9.99 ppm
3.00 to 8.50 ppm
r 2
0.0 Æ 199.9
μS
60.0 to 170.0
μS
10.0 Æ 99.9 ppm
30.0 to 85.0 ppm
r 3
0 Æ 1999
μS
600 to 1700
μS
100 Æ 999 ppm
300 to 850 ppm
r 4
0.00 Æ 19.99 mS
6.00 to 17.00 mS
1.00 Æ 9.99 ppt
3.00 to 8.50 ppt
r 5
0.0 Æ 199.9 mS
60.0 to 170.0 mS
10.0 Æ 200 ppt
30.0 to 170 ppt
Temperature Coefficient: These meters are factory set to a temperature coefficient of 2.1%
per
°C. For most applications this will provide good results. See Program P8.1 in
Section 7.9 to set the temperature coefficient to different value. See Addendum 3,
“Calculating Temperature Coefficients” to determine the appropriate temperature
coefficient for your solution.
Normalization Temperature: The factory default value for normalization temperature is 25
°C. If you need to normalize to a value other than 25 °C, see Program P8.2 in Section
7.9.