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ATI A15/66 Residual Sulfite Monitor

O&M Manual

Rev-W (8/10)

In operation, sample flows to the inlet chamber of the overflow assembly. Most of the sample

overflows to waste. A small amount of sample (5 cc/min.) is pumped out of the inlet chamber. Sulfuric

acid solution is supplied by the second pump and mixed with the sample in the mixing “T”, converting the

sulfite ion to molecular sulfur dioxide gas as follows.

+ 2 H

 SO

+ H

The reacted sample then moves to the air stripping chamber. In the stripping chamber, air is injected into

the incoming sample at a controlled rate. Sulfur dioxide gas is stripped from the sample into this air

stream and carried out of the reactor through a passage in the reactor cap. A special gas sensor located

in the flow block to the right of the stripping chamber measures the SO

concentration, providing a signal

to the A15/66 electronics module.

Air for the stripping process is provided by an air pump located on the circuit board in the rear

compartment of the chemistry module. Air from this pump is first filtered and then pumped through a

rotameter with flow indicator. The rotameter is used to adjust the flow of stripping air to the rate required

for the measurement, and should always be set to 400 cc/min. A check valve in the outlet of the air

supply line prevents sample from flowing back into the air supply system.

Reacted sample from the stripping chamber flows through a liquid trap and into a drain chamber.

Tubing from the drain chamber is directed into the drain side of the inlet overflow assembly as shown in

Figure 10.

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Analytical Technology A15 Spezifikationen Seite 15