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ATI A15/66 Residual Sulfite Monitor

O&M Manual

Rev-W (8/10)

CALIBRATION

Calibration of the Sulfite Monitor can be done in one of two ways. If an accurate laboratory

measurement can be made on the same sample that the sensor is measuring, the monitor can be

adjusted to the laboratory result. A sulfite standard can also be prepared in accordance with the

procedure on the following page, but the final value of the standard should be verified if possible by

laboratory test. A sample should be collected from the inlet line feeding the flowcell and quickly analyzed

for sulfite ion. When calibrating, it is best to have a reasonably high concentration of sulfite in the system.

The higher the value, the smaller will be the calibration errors caused by errors in the laboratory analytical

procedure. It is generally preferable to calibrate at values above 0.5 PPM to reduce calibration errors.

Series A15 sulfite monitors provide two alternate modes of calibration, "Immediate" and "Post".

Refer to configuration item 8 on page 23. The selection of the calibration method to be used must be

made in the configuration section of the program. If the sulfite value is relatively stable in the system, the

Immediate method may be used. However, if the value is subject to variations over a 5 minute time

period, the "Post" or delayed calibration method is best. The "Post" calibration method is always best if

there will be a delay in the time between collection of the calibration sample and the completion of the lab

test.

The "Post" or delayed calibration method allows the user to enter the sulfite value into memory at

the time a calibration sample is taken. When the lab analysis is complete, the calibration adjustment is

then done on the value that was displayed at the time the sample was taken. It does not matter if the

value has changed by the time the lab measurement is complete. When the original value is adjusted to

the lab result, the current reading will be adjusted by the same percentage.

IMMEDIATE CALIBRATION

To calibrate the monitor using the "Immediate" procedure, proceed as follows:

1. With the display indicating PPM SO3 (second display shown on page 14), press the CAL key once

and then press the ENTER key once. The display reads "SENS: XX.X%". The value of XX.X% can

vary from 20% to 400%, depending on the amount of amplifier gain required to calibrate the monitor.

When the UP key is used to increase the display value, the value of XX.X will go down, indicating that

the sensor output is declining, or that the sensitivity of the sensor is falling.

2. Press the CAL key and the display will change to "IMMEDIATE CAL" and will change to "CAL SO2:

X.XX PPM" after a few seconds. The value of X.XX will be the value being measured at that time.

3. Collect a sample from the flowcell inlet line and measure the sulfite concentration using the chosen

laboratory method.

4. Use the UP or DOWN keys to adjust the display to the value measured. Once adjusted, press the

ENTER key to return to normal operation.

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Analytical Technology A15 Especificaciones Pagina 27