For 35+ years A. P. BUCK, INC. has manufactured the most advanced and innovative instruments for indoor air sampling. We supply air sampling pumps and calibrators for industrial hygiene, indoor air quality, occupational health, environmental, health physics and safety disciplines. For more information on our product lines just click on the link that interests you.


Methyl ethyl ketone (CH3COC2Humidity Correction5)
Item Item Details
(Price is for domestic US market only)
Methyl ethyl ketone (CH3COC2Humidity Correction5)
Item Name:
Methyl ethyl ketone (CH3COC2Humidity Correction5)
Item #:

Product Image Gallery
Methyl ethyl ketone CH3COC2Humidity Correction5 NO.152D



Measuring Range

2 to 600 ppm

Sampling Hours

1 to 10 hours

Detecting Limit

2 ppm (10 hours)

Color Change

Yellow Reddish Brown

Reaction Principle

Methyl Ethyl Ketone reacts with hydroxylamine phosphate to librate
phosphrous acid, which discolors pH indicator to reddish brown.

3CH3COC2Humidity Correction5 + (NH2OH)3Humidity Correction3PO4 H3PO4
Humidity Correction3PO4 + Base Phosphate

Coefficient of Variation

10% (for 20 to 600 ppm-hr)

Shelf Life 2 Years
Corrections for
temperature & humidity
Temperature correction is necessary
Store the tubes in the refrigerator to keep at 10oC (50oF) or below.

Possible coexisting substances and their interferences (NOTE)




Change color by itself



Plus error

Discolors reddish brown



Plus error

Discolors reddish brown

Acid gases


Plus error

Discolors reddish brown
(Unclear demarcation)

Other substance measurable with this detector tube

Name of Substance

Correction Factor

Measuring Range



1.4 to 420 ppm

Methyl isobutyl ketone


4 to 1200 ppm



1.2 to 360 ppm

Calibration gas generation Diffusion tube method

TLV-TWA TLV-STEL Explosive range
200ppm 300ppm 1.7 to 11.4%

Range 2-600

Money Orders and personal Checks also Accepted, choose Pay By Mail during checkout!

Notice: This publication is intended for general information only and should not be used as a substitute for reviewing applicable government regulations, equipment operating instructions, or legal standards. The information contained in this document should not be construed as legal advice or opinion nor as a final authority on legal or regulatory procedures. A.P. BUCK Inc reserves the right to make changes to information, features, and specifications of any product without notice. A.P. BUCK Inc has made every effort to ensure the accuracy of information displayed on this Website, however, A.P. BUCK Inc. is not responsible for typographical errors appearing on this Website. Price and availability information is subject to change without notice.

View A.P.BUCK INC. Privacy Policy and Legal Notice
A. P. Buck Inc.'s Quality Policy is in Compliance with IS0 9002-1994
©1999-2017 A.P. BUCK INC.

A.P. Buck, Inc