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MODEL 54eA SECTION 8.0
CALIBRATION - FREE CHLORINE
7. Once the reading is stable, the screen at left appears.
Sample the process liquid. Make a note of the reading before taking
the sample. Immediately determine free chlorine. Note the controller
reading again. If the present reading (X) differs from the reading
when the sample was taken (Y), calculate the value to enter (C) from
the following formula:
C = (X/Y) (A)
where A is the concentration of chlorine measured in the grab sample.
Press Edit (F4). Use the arrow keys to change the concentration in
the second line of the display to the desired value. Press Save (F4)
to store the value.
8. Press High (F3). Adjust the concentration of chlorine in the process
until it is near the top end of the range, i.e., concentration near C2
as shown in Figure 6-2.
9. Press Cont (F3). “Wait” flashes until the sensor is stabilized.
10. Once the reading is stable, the screen at left appears. Following the
procedure in step 7, determine chlorine in a sample of the process
liquid.
Press Edit (F4). Use the arrow keys to change the concentration in
the second line of the display to the desired value. Press Save (F4)
to store the value.
11. Press Exit (F1) three times to return to the main display.
NOTE
If Hold was activated during calibration, “Hold Mode Activated”
will continue to flash in the main display. Return the sensor to
normal and deactivate Hold. Refer to Section 5.6, step 11.
6.000 ppm
Stabilizing . . . Wait
Abort Cont
2.000 ppm
Low point : 2.000 ppm
Exit High Edit
2.000 ppm
Calibrate high point
Abort Cont
6.000 ppm
High point : 6.000 ppm
Exit High Edit
NOTE
During calibration, ERROR and WARNING messages may appear. If an ERROR message appears, press
Exit (F1) to leave and return to the previous screen. If a WARNING message appears, press Cont (F3) to
continue the calibration or press Abort (F1) to leave. Continuing the calibration after a warning message
appears may cause substantial errors in the subsequent measurement. Refer to Section 15.5 for assis-
tance.
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