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Fomaldehydrade (HCHO)
Item Details
(Price is for domestic US market only)
Fomaldehydrade (HCHO)
Item Name:
Fomaldehydrade (HCHO)
Item #:
GAS-91M

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Formaldehyde HCHO NO.91M

91M


Performance

Measuring Range

8 to 20ppm

20 to 2000ppm

2000 to 6400ppm

Number of Pump Strokes

2

1

1/2

Correction Factor

0.4

1

3.2

Sampling Time

1.5 minutes per pump stroke

Detecting Limit

4 ppm (n=2)

Color Change

Yellow Red

Reaction Principle

3HCHO + (NH2OH)3H3PO4 H3PO4
H3PO4 + Base Phosphate

Coefficient of Variation 10% (for 8 to 200 ppm), 5% (for 500 to 2000 ppm)
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)

Substance

Concentration

Interference

Change color by itself

Acrolein

5 times

Plus error

Produces red stain at 20 ppm

Acetaldehyde

1/6 time

Plus error

Produces red stain at 3 ppm


Calibration gas generation Diffusion tube method


TLV-TWA TLV-STEL Explosive range
- C 0.3ppm 7.0 to 73%

 
Range 8-6400


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