Emerson Process Management 53eA instruction manual Section Calibration Free Chlorine 498CL-01

MODEL 54eA

2.000 ppm

Low point : 2.000 ppm

Exit High Edit

2.000 ppm

Calibrate high point

Abort Cont

SECTION 9.0

CALIBRATION - FREE CHLORINE (498CL-01)

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 9-2.

6.000 ppm

Stabilizing . . . Wait

9. Press Cont (F3). “Wait” flashes until the sensor is stabilized.

Abort Cont

6.000 ppm

High point : 6.000 ppm

Exit High Edit

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.

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 16.5 for assis- tance.

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