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USER SECTION
Chapter 5 – MAINTAINING YOUR CABINET
5.2
SELF CHECK TEST
This self check test is meant to determine the saturation point of Activated Carbon.
This procedures use Detection Tubes (Color Indicator Tubes)
Color indicator tubes can be used as a quick pass/ fail method to check for air purity, in other words, also
for determining when it is time to change Activated Carbon filters whereby the concentration of chemical
used after adsorption is above its threshold values. There are several indicator tubes' manufacturers,
namely, Drager and Gastec tubes which appear to be the most widely used. Tubes made by different
manufacturers may not be interchangeable because of size, volume and flow rate requirements.
Apparatus required:
1. Portable Hand Pump (or electric pump or flowing gas system)
2. Appropriate Color Indicator Tubes Suitable Connectors (tubings)
Description:
Color indicator tubes are sealed glass tubes which contains chemicals that react with a specific
compound (such as toluene, ethanol, moisture, carbon monoxide, and so on) to form a color or stain in it.
The concentration of the contaminant (specific chemical compound) is determined by the length of the
stain or from color intensity after passing a known required volume of air through it.
Procedures of Testing Compressed Air with Detection Tubes (Color Indicator Tubes):
1. Break both ends (tips) of the glass tube with the tube opener
2. Insert the tube tightly into the pump with arrow points towards the pump
3. Connect suitable tubing to the sampling port of ductless cabinet
4. To the other end of the tubing, fix it to the other opening of the glass tube
5. Using pump, suck the air through the tube by discrete-stroke (non-continuous) where the correct
volume is determined by the number of strokes
6. Read the entire length of the discoloration immediately which corresponds to the concentration of
contaminant (specific chemical compound) in the air sampled
Portable Hand Pump
Color Indicator Tube
Ductless Sampling Port
Tubing
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Summary of Contents for ASCENT OPTI BASIC
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