CALIBRATION METHODS
The Chlorine Analyzer/Transmitter must be calibrated using a solution with a known concentration of chlorine.
This solution may be either synthetically produced or be the process water to be measured. To arrive at the
known concentration, any of the following methods may be used:
1.
"Standard Methods", 15th Edition, 1980-Method 408D.
2.
"EPA Methods for Chemical Analysis of Water and Wastes", EPA 600/4-79-020, March 1979-Method
330-4.
3.
Delta Analytical Model 4024 Portable Chlorine Analyzer.
4.
Delta Analytical DPD-50 Chlorine Analysis Kit.
It is recommended that the Delta Analytical DPD-50 Chlorine Analysis Kit be used as it is simple to use and will
provide excellent results. The DPD-50 test procedure follows the calibration procedure.
CALIBRATION PROCEDURE I - FAC MODE (Refer also to Input Conditioner board Adjustments) (krig. 12)
1.
Turn the analyzer on and prepare it for use in accordance with preliminary instructions.
2.
Place the sensor and solution ground (connected to #14 Fig. 2) in a beaker with about 600 to 800 ml.
of Chlorine demand free water on a magnetic stirrer. Do not run stirrer so fast as to create air bubbles
in the solution. Add 1 ml. of pH5 buffer. Allow the sensor to stabilize for about 1 minute.
3.
Set Function Switch to FAC.
4.
Set Display Switch to CL.
5.
Set the RANGE SWITCH to its lowest value (0-1) and adjust the CL ZERO TRIMPOT (R 828) (PROBE
ZERO) until the display reads zero.
6.
Set the SPAN POT (R820) to about mid-range. Now add a dilute hypochlorite solution drop-wise until a
reading of between 25 to 50% of range is obtained. Allow the solution to stabilize for about 2 to 3
minutes. (Note: to prepare dilute hypochlorite solution, add 10cc of 5Z bleach, such as chlorox, to
100cc of water).
7.
Withdraw sample of solution and check for concentration of chlorine using DPD-50 test kit, or other test
method.
8.
Adjust the CL SPAN TRIMPOT (R820) to the value obtained with the test kit or other test method used.
The analyzer is now calibrated and the sensor may be placed in the sample stream.
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