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ATI A15/66 Residual Sulfite Monitor

O&M Manual

Rev-W (8/10)

POST CALIBRATION

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

1. With the display indicating PPM SO3 (second display shown on page 20), 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 25% 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 "SAMPLE VAL. REC." and will change to "CAL

SO3: X.XX PPM" after a few seconds. The value of X.XX will be the value being measured at that

time. Press the ENTER key and the value on the display will be recorded. The message "SAMPLE

V. UPDATE" will appear briefly, and then the display will revert to the PPM Cl2 display.

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

laboratory method. Record the lab value on paper for later entry into the monitor.

4. When the lab test is complete, go back to the monitor and use the MODE key to return to the PPM

SO3 display as described in step 1 above. Press the CAL key once and then the ENTER key. With

"SENS: XX.X% on the display, press the CAL key. The display will change to "SAMPLE VAL. ADJ."

and after a few seconds will change to "CAL SO3: X.XX PPM". The value of X.XX will be the value

that was recorded in step 2 above.

5. Use the UP or DOWN keys to adjust this value to the laboratory test result, and then press ENTER.

The display will briefly flash the "UPDATE" message and then will revert to the normal sulfite display.

Calibration is complete, and the current value will be automatically adjusted by the same percentage

as the original stored value.

MIXING A SULFITE STANDARD

While calibration against a lab analysis is preferred, it is possible to mix a sulfite standard that can

be used for calibration. The following procedure will produce a standard of about 2.5 PPM. The actual

value may be somewhat lower, but this procedure should be within about 10-15% of that value. You will

require reagent grade sodium sulfite, an analytical balance, a volumetric flask, and distilled water.

This standard requires 2 steps. First, accurately weight out 1.000 grams of sodium sulfite and

place into a 1 liter volumetric flask. Fill to 1 liter with distilled water. This will provide a concentrated

standard of about 635 PPM and is stable for a few days.

The dilute standard is only stable for about an hour, so this step should be taken just before use.

Place 500 cc. of water in a container and then add exactly 2 cc. of concentrated standard using a pipette.

Mix and feed into the sulfite monitor as a standard. The easiest way to feed this standard is through the

inlet port normally used for distilled water. Simply use the same inlet tubing used for zeroing to introduce

the mixed standard. Once the monitor has stabilized, adjust the display to 2.5 PPM using the calibration

procedure in the previous sections.

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Analytical Technology A15 Especificaciones Pagina 28