Drager pump

Table 10.18(b) Drager tubes for long-term measurements - with pump... 

Table 10.18(c) Direct-indicating Drager diffusion tubes - no pump required... 

There should be no measured speed at any point from the bottom to the top (anemometer). No opposite flow should be visualized with the Drager tube and pump. It is preferable that left to right speed variation be lower than 30% around the mean. The number of points out of this limit is to be minimized. 

For taking fairly small sample volumes (up to 2 1), which are generally analysed simultaneously with the sampling procedure, hand pumps are frequently used (such as those supplied by the company Drager). Large-volume syringes may also be used for such volumes. 

Fig. 4.23 Drager hand pump with the inserted reagent tube Reprinted by permission of Dragerwerk...

Figure 69. Drager Accuro pump kit and H2S detection tube...

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