Model: CD-36D 9. Option
-
40
-
Drainage Ditch
Opened to the air
Detector
(CLV Series or Model: CLR-21-A)
Column for Measurement
of Pure Water
Sample Inlet
Tube
(Polyethylene, 6 4)
Tube Joint
(1/4- 6 4)
Example of Piping for Conductivity modifying column
(b) Flow Rate and Electrical Conductivity
( i ) If the sample is introduced into the column, sodium chloride begins to dissolve and defuse into the
sample water through the filter resulting in the increase of electrical conductivity of the sample
water.
(ii) Since the electrical conductivity of city water is about 20 mS/m with very little fluctuation,
generally, the measurement of residual chlorine is not affected. If the conductivity of the sample
water, however, falls to a value lower than 8mS/m, the indication of the Transmitter tends to show
a lower value than the actual value. Practically, the measurement of residual chlorine may be
significantly affected when the concentration of the residual chlorine is greater than 2mg/L.
【IMPORTANT】 • The electrical conductivity of the sample water also fluctuates up and
down with the increase or decrease of the flow rate of the sample water.
Since the fluctuation of the sample flow affects the indication of the
Transmitter, make sure to supply the sample water so that the flow rate of
the sample water is maintained constant.
(c) Basic Specifications of the Conductivity modifying column
Materials of Construction : PMMA
Amount of Sodium Chloride in the
Column
: ca. 200g
Consumption of Sodium Chloride
Tablet
: 3 to 5g/day
(Assuming the flow rate of the sample water in the flow cell
is 50mL/min.)
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