13
(a) For inorganic pollutants, submerge the electrode in 0.1mol/L dilute hydrochloric acid for 30 minutes, then
wash it in pure water, then submerge it in the soaking solution for 6 hours.
(b) For organic or lipid pollutants, clean the platinum surface with detergent, then wash it in pure water, then
submerge it in the soaking solution for 6 hours.
(c) For heavily polluted platinum surface on which there is an oxidation film, polish the platinum surface with
toothpaste, then wash it in pure water, then submerge it in the soaking solution for 6 hours.
6. Conductivity Measurement:
6.1. Conductivity electrode information
6.1.1. Conductivity electrode
Model 2301T-S plastic conductivity electrode with constant K=1.0 and built-in temperature sensor, with
automatic temperature compensation function. The electrode housing is POM plastic which is corrosion
resistant and impact resistant. When submerging the conductivity electrode in solution, stir the solution briefly
to remove any the air bubbles. This will improve response time and stability.
6.1.2. Conductivity electrode constant
The meter matches conductivity electrodes of three constants: K=0.1, K=1.0 and K=10.0. Please refer to
chart-8 for measuring range. Set constant per parameter P2.1 and refer to clause 7.4.
Chart
–8 Electrode constant and measuring range
Range
＜
20
μS/cm
0.5
μS/cm~100mS/cm
＞
100mS/cm
Conductivity
electrode
constant
K=0.1 cm
-1
K=1.0 cm
-1
K=10 cm
-1
Standard
solution
84
μS/cm
84
μS/cm
1413
μS/cm
12.88mS/cm
111.9mS/cm
6.2. Conductivity calibration consideration
6.2.1. Conductivity calibration solutions
The meter uses conductivity standard solution:
84μS/cm, 1413μS/cm, 12.88mS/cm, 111.9mS/cm. Select the
standard solution per parameter P2.2 (clause 7.4). The meter can recognize the standard solution
automatically, can perform one-point or multi-points calibration (the maximum is four-point calibration). The
calibration guide icons correspond to the four standard values. ( corresponds to two groups of solutions)
See chart
– 9:
Chart
– 9 Conductivity standard solution series
Calibration guide icons
Calibration solution series
Range
84
μS/cm
0-200
μS/cm
1413μS/cm
200-2,000
μS/cm
12.88mS/cm
2-20mS/cm
111.9mS/cm
20-200mS/cm
