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ATI A15/66 Residual Sulfite Monitor

O&M Manual

Rev-W (8/10)

OPERATION

As previously discussed in the start-up section of this manual, the sensor must be given time to

stabilize. Power should be turned on at least one hour before trying to zero the system. If a new sensor

that was not on a keeper is installed it will take 24 hours. The sensor must be connected to the powered

monitor for the sensor to stabilize. The chemistry module does not have to be operating at this time, but

a better zero will result if the entire system is running. Establishing a stable zero is critical to the proper

operation of the monitor. The only procedure required before zeroing is the selection of the operating

range as described in item 3 of the CONFIGURATION section. The keyboard must be UNLOCKED to

complete the zeroing procedure described below.

ZEROING THE SYSTEM

Sulfite monitors can be zeroed easily by connecting distilled water to the inlet tubing. A 1/8” hose

barb is provided for convenience in feeding distilled water to the system. Using a length of 1/8” I.D.

flexible tubing, place one end on the hose barb and the other end into a bottle of distilled water. Adjust

the 3-way valve so that the OFF indicator is pointed down. This position isolates the sample pump from

the normal sample flow and opens the distilled water inlet. A one quart bottle is enough for zeroing

purposes, but permanently connecting a 1 gallon bottle of distilled water will allow zero checks whenever

desired.

Acid solution should be connected to the inlet tubing prior to zeroing the unit. Note that it takes

approximately 15 minutes for acid to get to the mixing “T” from the pickup tubing in a bottle located in the

brackets below the chemistry module. Special chemical resistant tubing is supplied, and no other tubing

should be used for this purpose. This tubing has a very small internal diameter to keep reagent transport

time to a minimum. Larger diameter pickup tubing will result in a long delay in acid delivery when the unit

is first started up.

To zero the system, proceed as follows. The unit should have been powered for at least an hour by

this time.

1. Connect distilled water as described above and allow the system to run for 30 minutes.

2. With the main operating display showing on the LCD, press the Mode key once. The display should

indicate "XX.XX PPM SO3". Press the CAL key once and the display will read "ZERO: XX nA" (the

value of XX will depend on the last zero). Press the CAL key again and the display will change to

"CAL ZERO: XX nA" with XX value indicating the zero current of the sensor.

4. Observe the display to determine that the zero current is no longer declining. The value may be

changing somewhat but should be varying about a point and not moving either up or down. Press the

ENTER key to store the offset value.

NOTE: If the zero current of the sensor is too large, the microprocessor will not accept the offset

value and will flash the message "NO UPDATE". Should this occur, carefully inspect the

sensor for a tear in the membrane. It will probably be necessary to replace the sensor if

damage has occurred. Should the offset remain high, contact the service dept. at ATI for

assistance.

5. Press the MODE key to return to the PPM display. The unit should now be reading zero PPM.

Depending on the range of operation, the display may vary slightly around zero, both plus and minus.

This is normal and should not cause concern.

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