PASCO CI-6729 (1X) CONDUCTIVITY SENSOR - Manual (Page 11)

7
012–06485B Conductivity Sensor
CONDUCTIVITY SENSOR
CI -67 29
2K 20 K 20 0
R A N G E SE LE C T
CONDU
CTIVITY
SENSOR
CI-6729
2K 20K
20 0
RAN GE SEL ECT
CONDUCTIVITY SENSOR
CI-6729
CI-6739A
Setup and Calibration
Set up Science Workshop
1. Attach electrode to the amplifier box (Figure 5a).
2. Plug the 8-pin DIN connector of the amplifier box into any analog
channel on a PASCO computer interface (Figure 5b).
3. Launch Science Workshop, drag the analog plug icon to the analog
channel icon, and select Conductivity Sensor.
4. In the Experiment Setup window, drag a Graph display to the Conductivity
Sensor icon ( ), and select the appropriate conductivity range to be
displayed. (The range setting selected on the amplifier box must match
the display range for the graph.)
➤ ➤ ➤ ➤ ➤ A Digits display may also be used to display conductivity.
Calibration
Prepare one of the weight percent NaCl solutions given in the table below
by weighing out in air the desired mass (mg) of NaCl in a 1-liter flask. Add
500 ml of deionized water and stir the solution to dissolve the salt. Add the
remaining 500 ml of deionized water and stir the solution.
➤ ➤ ➤ ➤ ➤ For direct measurements of conductivity greater than 20,000
µS the 10x electrode should be used. The 1x electrode may be
used if a 10:1 dilution of the solution to be measured is made. If
the 10:1 dilution method is used remember to multiply the value
indicated by 10.
➤ ➤ ➤ ➤ ➤ For measurements that require very high accuracy, a KCl
standard should be used (see Table 5 in the Appendix).
Other calibration solutions can be prepared using the tables and graphs in the
Appendix.
Figure 5
Plug the sensor into the computer
interface.
a
b
TDS ppm
or mg/liter Mass of
NaCl (mg)
0.001
0.01
0.1
1.0
10.0
10
100
1,000
10,000
100,000
10
100
1,000
10,000
100,000
21.4
210
1,990
17,600
140,000
Conductivity (µS/cm)
at 25 °C %Weight
(approx.)