50 A-96.250.571 / 050517
AMI Codes-II
Maintenance
6.5. Calibration
Process
Calibration of
DIS
NOTICE: Perform process calibration for free chlorine / total
residual chlorine only if:
• the sample concentration is close to the desired process
value (stable value)
• you are sure that the reagents are mixed completely and
correctly
• if the difference to the manual measurement is significant.
• Keep in mind the accuracy of your manual measurement.
Use CHEMATEST 25 (or equivalent photometer) to determine the
sample disinfectant concentration. Determine the sample disinfec-
tant value by 3 manual DPD measurements. Calculate the average
value. Compare this value to the value, indicated by the AMI.
Enter process value (mg/l = ppm) under menu 3.1.1, p. 78 for Pro-
cess DIS
Possible error message see Calibration Errors, p. 65.
Zero A zero is automatically done before each measurement.
Press 3 x [Exit]
3.1.1
Process pH
Process DIS.
Calibration
Standard pH
Enter
3.1.1.4
Process DIS.
Current Value x.xx ppm
Slope x.xxx
Save <Enter>
Process Value x.xx ppm
3.1.1.4
Process DIS.
Current Value x.xx ppm
Slope x.xxx
Save <Enter>
Process Value x.xx ppm
3.1.1.5
Process DIS.
Current Value x.xx ppm
Slope x.xxx
Calibration Successful
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