Model: CD-36D 5. Calibration
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Disconnect the lead wire
“1” from its terminal.
Disconnect the lead wire “1”.
③ Adjust the zero point. ⋅⋅⋅⋅⋅⋅ Wait until the indication stabilizes (for ca. 1 to 2min), and then, adjust
the indication to “0.00”mg/L by turning the “ZERO” knob.
④ Connect the lead wire “1”. ⋅⋅⋅⋅⋅⋅ Connect the lead wire “1” back to the terminal “1” like before.
⑤ Close the rear cap. ⋅⋅⋅⋅⋅⋅ Close the rear cap tight.
⑥ Change to “Measurement” mode. ⋅⋅⋅⋅⋅⋅ Turn the mode switch to “”Measurement mode (MEAS)
and confirm that the pilot lamp is lit continuously.
At this point, the zero calibration is finished. Now, proceed to the span calibration.
(2) Span Calibration
The span calibration is an operation to adjust the indication of the Transmitter to an analyzed value
obtained with “DPD method”, “Amperometric titration method”, etc. for the residual chlorine in the
sample being measured.
① Aging. ⋅⋅⋅⋅⋅⋅ Under the conditions for measurement, let the sample flow through the flow cell for
more than 30 minutes as aging before starting the span calibration.
② Analyze the residual chlorine in the sample with another method. ⋅⋅⋅⋅⋅⋅ Collect a portion of the
sample water out of the flow being supplied to the flow cell when the concentration of the residual
chlorine in it is stable for analysis with “DPD method”, “Amperometric titration method”, etc.
③ Adjust the span value. ⋅⋅⋅⋅⋅⋅ By turning the “SPAN” knob, adjust the indication of the Transmitter
to the analyzed value obtained in the previous step ②.
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