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ATI A15/76 Turbidity Monitor Part 6 – Operation

O&M Manual

Rev-H (8/11)

Check Signal Display

The check signal display (D3, page 16), is a display routine used to provide an indication of the

condition of the sensor. The check signal value will decrease as any types of deposits foul the sensor. If

the sensor becomes dry due to loss of sample flow, the check signal value will go to a high number.

In normal operation with a clean sensor, the check signal value will be around 100%. In fact, the

operator can calibrate this signal to 100% after cleaning to provide a good reference point. To calibrate

this function, make sure that the sensor is clean and that the sensor has proper liquid flow. Proceed as

follows:

1. Advance to the D3 display and press CAL. The display will indicate “CAL C.: XX.X%”. Normally, the

value will be around 100%. Press CAL again and the value will be set to 100%. This will then serve

as a reference point for comparison of the sensor performance over time.

2. After setting the check signal value to 100%, you can adjust the signal value at which you want the

sensor fouled alarm to activate. The display will read “FOULING: XX.X%”. Use the UP and DOWN

keys to select the amount of fouling required to activate the alarm. A good value for this setting is

around 50-60%. The higher the value you set, the smaller the amount of fouling that will be needed to

activate the alarm. Press ENTER after selecting the setpoint.

3. After pressing ENTER, the display will indicate “DRY CELL: XXX.X%”. This is the check signal level

that will cause the dry cell alarm condition. Normally, this should be set to around 200%. Adjust the

value to the desired point and press ENTER.

4. After setting the dry cell alarm point, the display will indicate “DELAY: XX.Xs”. This is the amount of

time delay that the monitor will apply to a “fouling” or “dry cell” alarm condition. The default is 10

seconds, but this can be set from 0 to 99.9 seconds. Press ENTER and the settings will update.

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Analytical Technology A15 Specifiche Pagina 30