Formaldehyde ChromAir Color Comparator (384001)

The color comparator allows you to detect a wider range when used with the standard badge.

Note: we are not able to ship these badges overseas

Formaldehyde Information


Color change for Formaldehyde is from yellowish-brown to brown.

The ChromAir Formaldehyde badge may be used for personnel or area monitoring for exposure times ranging from 15 minute to 2 days. For higher resolution, this color comparator can be used with the ChromAir formaldehyde badge (part number: 380007-10).


Formaldehyde is a colorless gas with a pungent, suffocating odor. It is a potent irritant to eyes, throat and nose. The most common effects of low level formaldehyde inhalation are eye, nose and upper respiratory irritation. Chronic symptoms of exposure are itching eyes, dry and sore throat, and possible difficulty in sleeping and unusual thirst after awakening. OSHA exposure limit for formaldehyde is 0.75 ppm (TWA). NIOSH exposure limit is 0.016 ppm (TWA). NIOSH also recommends that formaldehyde be handled as a potential occupational carcinogen in the workplace.

Formaldehyde workplace exposure occurs because of its extensive use as an industrial chemical in the manufacturing of resins for adhesives, plastics, coatings and fabrics. Additional exposure to formaldehyde emissions comes from its use as a fumigant and sterilant. The major source of atmospheric discharge of formaldehyde is from combustion processes, specifically from the photo-oxidation of hydrocarbons in auto emissions.

Principle of Operation

The ChromAir passive badge is a patented direct-read autogenic exposimeter. The monitor is constructed from six cells attached on one side to a flat indicator layer and on the other side to a series of different diffusive resistances. Formaldehyde gas diffuses to the cells through the different diffusive resistances and reacts with the indicator layer, producing color change from yellowish-brown to brown. The color produced on the indicator layer is a direct measure of the exposure dose. Visual color is achieved by observing the formation of the brown threshold color on the individual cell and reading the corresponding exposure dose.

Direct Read Color Comparator Safety Monitor

Pictured above is the additional color comparator that is used for higher resolutions and accuracy (available for Carbon Monoxide, Formaldehyde, Mercury).

Operating Instructions

1. Remove the pouch from refrigerator and allow it to warm to room temperature.

2. Remove the badge from its protective pouch.

3. Enter all pertinent information on the I.D. label before monitoring is started (i.e. name, location, date and start time).

4. For personnel monitoring, attach the badge near the user's breathing zone (i.e. collar) with the front side exposed to the surrounding atmosphere.

5. For area monitoring, attach the badge to a stand and mount in a centralized area with the front side exposed to the surrounding atmosphere.

6. Check the back side of the badge periodically to determine the exposure dose (ppm•hr).

7. To read the badge, locate the highest level cell with brown threshold color.

8. To obtain the average concentration (ppm) in the surrounding atmosphere, divide the exposure dose (ppm•hr) by the exposure time in hours.

EXAMPLE: If the sampling time is 2 hours and the badge reads 2 ppm•hr, the average concentration is determined by: 2 ppm•hr Therefore the average concentration is 1 ppm.


The ChromAir formaldehyde monitor should be refrigerated in its sealed bag at all times.

Sampling Parameters

Color Change

yellowish-brown to brown

Exposure range (Badge)

0.3 - 12 ppm•hr

Exposure range (Badge used with color comparator)

0.3 - 40 ppm•hr

Maximum recommended sampling time

2 days

Minimum recommended sampling time

15 minute

Relative humidity range

30% - 80%

Face velocity range

5 - 150 cm/sec

Temperature range

16ºC - 35ºC (61ºF - 95ºF)

Mean coefficient of variation

+/- 10.23

Bias at ambient conditions

 -2.73 %

Light effect - UV (direct sunlight)

no effect

Light effect - visible

no effect

Refrigerated shelf life

 1 year



384001 & 380007 Manual

Formaldehyde Information

More Information
Manufacturer Morphix
Call For Price No
Gas Formaldehyde (CH2O)
Standard Range .3 - 12 PPM
Operational Temperature Range 16ºC - 35ºC (61ºF - 95ºF)
Operational RH Range 30% - 80%
Write Your Own Review
You're reviewing:Formaldehyde ChromAir Color Comparator (384001)
Your Rating