For measuring the air concentration of chemicals including formic acid and inorganic acids.
These tubes are used to measure the average concentration of potentially harmful vapors in the air over a defined sample period. To use, the tube is connected to a small vacuum pump that draws air through the tube at a precise flow rate over a period of time. After the sample is taken, the tube is transported to a laboratory where they can remove the adsorbent material and perform analysis by solvent extraction and gas chromatography (GC) to determine the quantity of chemical collected, from which a time-weighted average (TWA) concentration can be calculated.
| Sorbent Material
| Silica Gel specially cleaned as stated in Appendix A of NIOSH method 2011
| Flow Resistance
| ≤ 10 kPa at flows up to 500cc/min
| Operating Temperature Range
| 10 to 40o C between 20-80% RH
| Blank Tube Background
| ≤ NIOSH LOD for the target vapor
| Standards Compliance
| ISO 22065
|Primary Sorbent Weight
|Backup Sorbent Weight
Additional Information Available
Zefon Silica Gel Specially Cleaned Sorbent Tube Operating Instructions