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The ChromAir® system consists of a direct reading colorimetric badge and a color comparison chart. Users can now monitor
for toxic gases without the use of a pump or time consuming laboratory analysis.
- Immediate, on-site results
- Easy-to-read color change
- Highly sensitive and selective
- Exposure data read directly from badge
- Immediate response for short-term exposure measurements
- Measure TWA exposures
- Patented design minimizes effects of humidity and air velocity
- Light-weight and cost effective for personnel and area monitoring
- No laboratory analysis needed
ChromAir badges are available for the following compounds:
(Click on compound links to view the operating instructions and technical summaries)
Principle of Operation
The ChromAir badge is a colorimetric direct-read monitor. It relies on the principle of diffision; therefore requires no
pump to operate. Unlike traditional diffusion tubes, the patented design of the ChromAir badge provides a short and constant
diffusion path irrespective of the sampling time or concentration of the contaminant. This unique feature provides
accurate results immediately and throughout the sampling period.
The ChromAir monitor provides the user with six exposure levels*. Most ChromAir badges indicate from 1/10 to 2 times the
time-weighted-average for an eight hour work period. The scale** printed on the badge and color comparator is based on
exposure dose [parts per million times hour (ppm·hr)]. To determine the average concentration, the user locates the highest
cell with a color change and divides the corresponding dose level (ppm·hr) by the sampling time in hours (hrs). EXAMPLE:
If the sampling time is 2 hours and the badge reads 40 ppm·hr, the average concentration is determined by:
40 ppm·hr/2hrs. Therefore, the average concentration is 20 ppm.
* The ChromAir mercury and glutaraldehyde badges have five levels.
** The ChromAir mercury badge scale is in mg/m3·hr. The ChromAir glutaraldehyde badge is for STEL sampling only.
ChromAir Color Comparators
To determine exact exposure dose, the ChromAir badges can be used with a ChromAir color comparator. Insert exposed ChromAir badge into the
ChromAir color comparator and move the slider until the color formed on the badge matches the color scale on the color comaprator.
Now read the exposure dose from the exposure dose window on the color comparator. To obtain your average concentration, divide
the exposure dose by your sampling time.
ChromAir Color Comparators are available for the following compounds:
- Ammonia
- Carbon monoxide
- Chlorine
- Formaldehyde
- Hydrogen sulfide
- Mercury
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