|Sampling Rate for Formaldehyde||
28.6 ml/min with a RSD of 18% (for 15-min to 8-hrs or 24-hrs
See the Passive Sampling Guide for UMEX 100 sampling rates for other aldehydes.
|Detection Principle||Formation of stable DNPH (2,4 dinitrophenylhydrazine) in the presence of formaldehyde|
|Concentration Range||5 ppb to 5 ppm|
|Lower Detection Limits||15-min: 200 ppb (0.24 mg/m3)
8-hrs: 5 ppb (0.006 mg/m3)
24-hrs 2 ppb (0.002 mg/m3)
7 days 0.2 ppb (0.0002 mg/m3)
|Shelf-life||12-mo from date of manufacture at < 39.2F (4C)|
|Analysis||Desorption of hydrazine and analysis by high-performance liquid chromatography (HPLC) with UV detection|
|Accuracy||± 25%, exceeds OSHA requirements|
|Storage||Before use: < 39.2 F (4C)
After use: < 39.2 F (4C) and analyze within three weeks
Do not store with food.
|Temperature Effects||No effect on sampling rate between 10 and 30 C|
|Humidity Effects||No effect from 10 to 80% relative humidity (RH)
Do not use sampler below 10% RH.
|Wind Effects||No effect from 0.05 to 1.0 m/s
good correlation at 0.02 m/s
|Interferences||Large amounts of carbonyl compounds may reduce the uptake of formaldehyde.
Use in ozone levels < 0.5 ppm.
|Dimensions||3.4 x 1.1 x .35 in (8.6 x 2.8 x .89 cm)|
|Weight||0.38 oz (10.8 gm)|