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List of available indicators

 

Chemical Name

Minimum detectable limit (ppm•hr)

Operating temperature

(oC)

Operating Humidity (%RH)

Color change

Shelf life (Years)

Cross interferences

1

Acetone

5

10 to 35

5 to 95

Yellow to red

1

Other methyl ketones

2

Acids

0.05

10 to 30

5 to 95

Yellow to red

2

Bases impair the indicator

3

Ammonia

3

10 to 30

5 to 95

beige to black

1

Primary aliphatic amines

4

Aniline

0.2

10 to 40

5 to 95

orange to maroon

2

See attached document

5

Aromatic Amines

0.015

10 to 40

5 to 85

orange to maroon

2

See attached document

6

Aromatic diisocyanates

0.005

10 to 40

5 to 85

White to red

1

None known

7

Arsine

0.02

10 to 35

5 to 85

White to brown

1

Mercury, stibine and other hydrides

8

Bases

0.5

10 to 35

5 to 85

Yellow to blue

2

Acids impair the indicator

9

Carbon monoxide

8

10 to 35

5 to 85

Brown to black

1

Acetylene, Ethylene, H2S and H2

10

Chlorine

0.2

10 to 30

5 to 85

yellow to pink

1

Br2 and F2, HCl impair the indicator

11

Chlorine dioxide

0.2

10 to 35

5 to 85

off white to gray

1

None known

12

Dimethyl amine

5.0

10 to 35

5 to 90

white to yellow

1

Other secondary amines

13

Dimethyl hydrazine (-1,1)

0.01

10 to 40

5 to 90

orange to maroon

2

MMH and hydrazine

14

Ethyl chloroformates

0.02

10 to 35

5 to 95

Yellow to red

1

See attached document

15

Fluorine

0.2

10 to 35

5 to 85

Yellow to pink

1

Cl2, Br2 and I2, HCl impair the indicator

16

Formaldehyde

0.4

10 to 35

5 to 85

brown to blue

1

See attached document

17

Hydrazine

0.005

10 to 40

5 to 90

orange to maroon

2

MMH and UDMH

18

Hydrogen chloride

0.05

10 to 40

5 to 90

Green to off white

2

None known

19

Hydrogen fluoride

0.05

10 to 40

5 to 90

Red to off white

2

None known

20

Hydrogen sulfide

0.3

10 to 40

5 to 95

Blue to brown

2

None known

21

Iodine

0.2

10 to 35

5 to 85

Yellow to brown

1

Br2, HCl impair the indicator

22

Mercury

0.3mg/m3•hr

10 to 35

5 to 85

Off white to orange

1

Hydrides

23

Methyl chloroformate

0.02

10 to 35

5 to 90

Yellow to red

1

See attached document

24

Methyl ethyl ketone

5

10 to 35

5 to 95

Yellow to red

1

Other methyl ketones

25

Monomethyl hydrazine

0.005

10 to 40

5 to 90

orange to maroon

2

Hydrazine and UDMH

26

Nitrogen dioxide

0.005

10 to 30

5 to 90

White to red

1

Nitrous acid and O3

27

Ozone

0.01

10 to 35

5 to 90

Blue to white

1

H2O2 and NO2

28

PhosgenePhosgene

0.015

10 to 35

5 to 95

Yellow to red

1

See attached document

29

Phosphine

0.005

10 to 35

5 to 85

White to gray

1

Other hydrides

30

Sulfur dioxide

0.2

10 to 35

5 to 85

Beige to brown

1

None known

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Toxic Gases in Air, Colorimetric Indicators, OSHA NIOSH Exposure limits. Toxic Gases in Air, Colorimetric Indicators, OSHA NIOSH Exposure limits.
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Toxic Gases in Air, Colorimetric Indicators, OSHA NIOSH Exposure limits. Toxic Gases in Air, Colorimetric Indicators, OSHA NIOSH Exposure limits.