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ATI A15/66 Residual Sulfite Monitor

O&M Manual

Rev-W (8/10)

CHEMISTRY MODULE STARTUP

Prior to operating the chemistry module, connect inlet sample and drain tubing to the hose barbs

provided on inlet overflow assembly. Recheck to be sure that the sample pickup tube from the sample

pump and the drain tube from the stripping chamber are inserted into the proper chambers of the overflow

assembly. A 3-way valve on the inlet to the sample pump is supplied so that distilled water or a captured

sample can be fed into the unit through a separate sample line. An 1/8” I.D. hose barb on the front of the

valve is provided for connection of a pickup tube for distilled water or other sample.

Two sensors for the system are shipped in a separate container. One of these sensors contains

a keeper plug on the end and the other does not. The keeper plug maintains the sensor in stable

condition ready for immediate use. Disconnect the keeper plug and plug the sensor cable into the back of

the sensor. Remove the protective cap from the end of the sensor and slide it into the sensor flow block.

The sensor will slide past the o-ring seal and stop against the ledge inside the block. Plug the keeper into

the spare sensor and store it in a convenient place. Storage in a sealed container in a cool location is

best.

Once sample and drain connections are made, carefully turn on the sample flow so that sample is

overflowing into the drain chamber. The rate of sample flow is not critical. However, the flow must not be

so high that the drain cannot carry the excess away without overflowing the entire assembly. The drain

chamber should remain almost empty during normal operation, with sample flowing freely out of the drain.

Once the sensor is in place, the sample pump pickup tube is located properly, and the acid bottle

is connected to the acid pump, plug the AC power cord into any AC outlet. The two peristaltic pumps on

the bottom of the module will start to turn and the rotameter on the panel should begin to indicate the air

flowrate going to the bottom of the reactor. Use the air flow control valve to adjust the rotameter to 400

cc. per minute. Note that this air flow adjustment should not be made until sample has entered the

stripping chamber.

It is recommended that you start up the system with a bottle of distilled water connected to the

second inlet port as mentioned above. Connect tubing to the 1/8” barb fitting and turn the 3-way valve so

that the handle is down. This will close off the normal inlet and open the alternate inlet so that distilled

water can be pumped into the system. The monitor needs to be zeroed initially, so it is best to start the

system with water containing no sulfite.

The system will take some time to get sample into the reactor chamber and to begin to deliver

acid into the system. It is best to allow the system to run undisturbed for at least 1 hour after initial

startup. Note that the electronics module should also be powered up at this time. The sensor will not

stabilize unless the power to the monitor is turned on. After about 5 minutes of operation, you should see

small air bubbles in the sample line connected to the air chamber coming from the reagent pumps line.

After the chemistry module has been running for an hour on distilled water, the sensor should be

stable near zero. The LCD display on the electronic module may not be reading exactly zero, but the

value should normally be less than 0.5 PPM and the value should be stable. If the system is not yet

completely stable, the value may be decreasing very slowly. Wait to zero and calibrate the unit until the

value stabilizes. Note that the zero value may vary by  0.010 PPM (10 PPB) both up and down once it

reaches stability. This is the normal zero stability. At this point, the system is ready for zeroing and

calibration as described in the operating section. However, you may want to first go through the

configuration of the electronics to set the analog output range and configure any alarms you may wish to

use. The next section covers the various configuration settings.

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