®
Advanced Water Quality Sensor Optical Dissolved Oxygen Probe Replacement Cap Cal-
10
012-14325A
Solutions for Conductivity Calibration
Appendix B: Optical Dissolved Oxygen
Probe Replacement Cap Calibration
After a new replacement Sensor Cap (PS-2587) is placed on the Optical Dissolved
Oxygen probe, there are two parts to the sensor calibration process.
1.
With the probe connected to the sensor and the sensor connected to the PASCO Inter-
face, use the data acquisition software to enter the Calibration Code coefficients (six
groups of numbers labeled K1 to K5 and KC) for the replacement Sensor Cap into the
sensor.
2.
Perform a one-point calibration using a “known standard” such as air-saturated water.
Alternatively, a two-point calibration could be performed using two calibration stan-
dard solutions.
3.
Refer to the User’s Guide or Online Help for the PASCO software, or go to the
PASCO web site at www.pasco.com and enter “Optical Dissolved Oxygen Sensor” or
“PS-2196” in the Search window. Download the instruction manual PDF file under
the User Resources tab.
Capstone: Calibration Code Coefficients
The replacement Sensor Cap comes with a Calibration Code Label (see the example).
Reference
Solution
Approximation
Normality of
Solution
Method of Preparation
Temperature
(°C)
Electrical
Conductivity
1
(µS/cm)
A
1
74.2480 g of KCI weighed in air per 1 L of
solution at 20 °C
0
65176
18
97838
25
111342
B
0.1
7.4365 g of KCI weighed in air per 1 L of
solution at 20 °C
0
7138
18
11167
25
12856
C
0.01
0.7440 g of KCI weighed in air per 1 L of
solution at 20 °C
0
773.6
18
1220.5
25
1408.6
D
0.001
Dilute 100 mL of solution C to 1 L at 20 °C
0
77.69
18
127.54
25
148.93
1
Excluding the conductivity of the water used to prepare the solutions. These tabulated conductivity values are in international
units. When using measuring instruments calibrated in absolute units, multiply the tabular values by 0.999505
Example: Calibration Code Label
