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ATI A15/66 Residual Sulfite Monitor

O&M Manual

Rev-W (8/10)

MAINTENANCE

The A15/66 Sulfite Monitor will generally provide unattended operation over long periods of time.

With proper care, the system should continue to provide measurements indefinitely. For reliable

operation, maintenance on the system must be done on a regular schedule. Keep in mind that preventive

maintenance on a regular schedule is much less troublesome than emergency maintenance that always

seems to come at the wrong time.

SENSOR SERVICE

Vapor phase sulfite sensors do not require service. These sensors will normally provide 6-12

months of continuous use, and are disposable at the end of their life. An occasional visual inspection of

the white membrane on the end of the sensor will reveal any buildup on the tip that might inhibit sensor

response. The membrane can be rinsed off with distilled water, but no cleaning solutions of any kind may

be used.

A spare sensor is supplied in the event that the original sensor cannot be calibrated. After

several months of operation, the sensor output may fall to a level where the monitor can no longer be

adjusted. This is indicated by a “No Update” message when you attempt to calibrate the unit. The spare

sensor should ideally be stored in a cool place. Leave the sensor cap in place. Storage in a refrigerator

is best, but an air-conditioned office is OK. Try to avoid storage in a hot location.

REACTOR MAINTENANCE

The maintenance on the reactor is simply to keep it clean. The reactor is clear to assist operators

in examining the condition of the reaction and drain chambers. It is possible that buildup could occur in

either the sparging chamber or the drain chamber. Pouring a small amount of dilute bleach solution

through the drain chamber will clean out biological materials that might accumulate. A cap at the top of

the reactor can be removed to allow cleaner to be poured into the drain chamber.

A removable clean-out plug is located at the bottom of the overflow chamber. Should solids

accumulate in this chamber, disconnect power to the chemistry module to stop sample flow and then

remove the plug at the bottom of the chamber. When removing the plug, use a paper towel or absorbent

cloth to absorb the water trapped in the overflow chamber. Pour distilled or tap water through the

chamber from the top to flush out any solids or use a brush to clean any material adhering to the side

walls.

CAUTION: The water trapped in the overflow chamber when the plug is removed is highly acidic.

Wear protective gloves and do not get water in eyes or on clothing. If eye contact

occurs, flush with large amounts of water and get medical attention. Contact with

clothing can cause damage to fibers.

Change the o-ring in the flowcell yearly or if any damage is observed. If insertion of the sensor

into the flowcell becomes difficult, use silicon grease to lubricate the o-ring that holds the sensor in place.

Use only enough grease to provide surface lubrication. Excess grease could foul the sensor membrane.

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Analytical Technology A15 Especificaciones Pagina 35