5.Remove the sensor from the pH 7 buffer and rinse. Place the sensor in a pH 4 buffer solution and stirfor a minute or two. Allow the reading to stabilize and adjust the pH SPAN TRIIPOT (R855) until theLCD display reads 4.00. Repeat steps 4 and 5 to check that the pH zero and pH SPAN adjustmenthasn't changed. The instrument is now calibrated for pH.6.To calibrate the analyzer in the TFC/AUTO MODE place the pH sensor, the chlorine sensor and thesolution ground in a beaker of chlorine demandfreewater on a magnetic stirrer. Do not run the stirrerso fast as to create air bubbles in the solution. Add 1 ml. of a pH 4 or 5 buffer. Allow the sensor tostabilize for about 3 to 5 minutes.7.Set the display switch to chlorine.8.Set the range switch to its lowest setting (0-1 ppm) and adjust the CL ZERO TRIMPOT (R828) until theLCD display reads 0.00.9.Now add a dilute hypochlorite solution drop wise until a reading of between 25 to 50% of range isobtained. Allow the solution to stabilize for about 2 to 3 minutes. (Note: To prepare dilute hypochloritesolution, add 10 cc of 5% bleach, such as clorox to 100 cc of water).10.Withdraw sample of solution and check for concentration of chlorine using DPD-50 test kit or other testmethod.11.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.CALIBRATIONPROCEDUREIIThis procedure may be used to calibrate the analyzer and sensor while it is in the process water.1.Turn the analyzer on and prepare it for use in accordance with steps 1 through 5 of calibrationprocedure I-FAC MODE.2.Return the sensor to the process stream. Allow 2 or 3 minutes for meter to stabilize.3.After the 2 or 3 minutes, withdraw a sample from the process water and determine concentration ofchlorine using DPD-50 test kit or other recommended test.4.Adjust CL SPAN TRIMPOT (R 820) to the value obtained with the test kit or test method used. Theunit is now calibrated.NOTEThe chlorine concentration in the process stream should not change during thecalibration process.16
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