CHROMAIR
SYSTEM
§  Immediate, on-site results
§  Easy-to-read color change
§  Highly sensitive and selective
§  Exposure data read directly from badge
§  Measure TWA exposure
§  Immediate response for short-term exposure measurements
§  Patented design minimizes effects of humidity and velocity
§  Light-weight and cost effective for personnel and area monitoring
Principle of Operations
The ChromAir badge is a colorimetric direct-read monitor. It relies on the principle of diffusion;
therefore it 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. 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 (TWA) 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, locate the highest cell with a color
change and divide the corresponding dose level (ppm•hr) by the sampling time in hours (hr).
EXAMPLE: If the sampling time is 2 hours and the badge reads 40 ppm•hr, the average concentration
is determined by: 40 ppm•hr/2hr. Therefore, the time weighted average concentration is 20 ppm.
PART#	ANALYTE	RANGE (ppm•hr)	INTERFERENCES
380003	Ammonia	4 - 300	RNH2
380008	Carbon Monoxide	10 - 525	Alkenes, H2, H2S
380004	Chlorine	0.4 - 13	Br2, I2, HCl
380007	Formaldehyde	0.3 - 12	Acrolein
380017	Glutaraldehyde	0.04 – 0.95¹	None Known
380018	Mercury	0.125 – 1.6 ²	Strong Oxidizers
380010	Ozone	0.08 – 1.6	H2O2, NO2 ³
¹ ChromAir glutaraldehyde STEL badges are for 15 minutes of monitoring only. The scale on the
Badge is in ppm.
² ChromAir mercury badge and color comparator scale is in mg/m³•hr
³ ChromAir ozone badges are ten times more sensitive to ozone than nitrogen dioxide.