Manual

Chapter 6: Maintaining Your Enclosure

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Time - For applications that have very consistent inlet concentrations and

operating time, “Time” can be used to anticipate saturation or TWA levels based

on prior experience. However, this does not replace the need for sampling.

Consult Labconco technical specialist for an estimate of carbon filter life based on

chemical usage. Detector tubes, or analytical instrumentation should always be

used to determine concentrations in the carbon filter. It is recommended that the

carbon filters be checked with detector tubes or other means at intervals of 20% of

the total estimated filter life. The exception to the 20% recommendation is

formaldehyde and any carcinogen or suspected carcinogen. These more hazardous

chemicals must be checked at least every 10% of the total estimated time.

Analytical Instrumentation - This is the most accurate means of measuring

concentrations of any chemical. It is the method of choice when no detector tubes

are available or the tubes are not sensitive enough to measure at the TWA

concentration for the chemical. This method is also to be used to determine

saturation when the chemical concentration is below the measurement range of

detector tubes.

Carbon Filter Replacement Procedure – See Figure 6-10 for Carbon Filter

Replacement.

1. The carbon filters are replaced by first removing the two knobs, which hold

the rear perforated baffle in place. Then carefully lower the perforated

baffle, which is heavy because of the carbon filters.

2. Carefully remove both carbon filters.

3. If using formaldehyde, the formaldehyde filter is always placed

downstream of the organic vapor filter. (The formaldehyde filter is on top

of the organic vapor filter in the loading position. The same applies with

ammonia and formaldehyde. No specific placement is required with

organic vapor and ammonia.

4. Re-install the new carbon filters with the gasket up or on the downstream

side.

5. Pivot the perforated baffle up and replace and tighten the knobs.