MODEL 54eA | SECTION 4.0 |
| DISPLAY AND OPERATION |
SECTION 4.0
DISPLAY AND OPERATION
4.1 GENERAL DESCRIPTION
The 54eA analyzer/controller is a normally a single input, dual output instrument. It does, however, accept a second input for pH when the main measurement is free chlorine. Figure
FIGURE 4-1. Configuration of Inputs and Outputs
for Free Chlorine
The main sensor is always the chlorine sensor and the sec- ondary sensor is always the pH sensor. Outputs can be assigned to free chlorine, to pH, or to temperature. The outputs can be configured as either linear
In addition to PID control, the 54eA controller can be used for time proportional control (TPC). TPC control uses the alarm relays.
4.2 DISPLAY
Figure 4-2 shows the main display.
1.00ppm
26.2°C. | 12.00 mA |
pH: 8.00 | I: 340 nA |
FIGURE 4-2. Main Display Screen
The amperometric measurement (oxygen, ozone, free chlorine, or total chlorine) is always displayed continuously in large numerals. The temperature and output current are always displayed on the second line of the main display. The third line can be configured by the user. In the exam- ple, the third line shows the pH reading and the ampero- metric sensor current in nA.
4.3 KEY FUNCTIONS AND CONTROLS
The keys labeled F1, F2, F3, and F4 are
1.To enter the main menu, press any key.
2.Use the é and ê keys to move the cursor to the desired
NOTE
When the last item of a menu has been reached, the cursor will be on the third line of the display. If the cursor is on the second line of the display more items remain. Continue pressing the ê key.
3.Press Enter (F4) to access a
4.To change a number or a setting press Edit (F4).
The display will change to show the cursor on the first digit or on a + or - sign. Use the é and ê keys
to increase or decrease a digit or to toggle the + and - signs. Use the ç and è keys to move the cursor left and right.
5.If an entire number or a word is highlighted, use the é and ê keys to scroll through the list of choices.
6.To store a number or setting in memory, press Save (F4).
7.To leave without storing changes, press Esc (F3).
8.To leave and return to the previous screen, press Exit (F1).
9.To end a calibration step and leave the previous calibration in place, press Abort (F1).
10.Occasionally, information screens will appear. To leave the information screen and move to the next screen press Cont (F3).
4.4 ALARM STATUS
Green LEDs (labeled 1, 2, and 3) indicate when alarm relays 1, 2, and 3 are energized. The fourth relay indi- cates a fault condition. When a fault occurs, the red LED (labeled FAIL) lights up, a descriptive error mes- sage appears, and the outputs and alarm relays act as described in Section 5.6 and Section 5.7 under fault value.
The red LED also indicates when the interval timer rou- tine is activated and when the time limit has been reached on a feed limit timer. For more information on these subjects, see Section 5.7.
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