3 Sampling Introduction Methods

Theo Wilson -

Sample Introduction wheel

The sample introduction wheel is used to vary the flow rate of sample entering the system.

There are six settings on the wheel and Table 1 outlines the approximate sample flows for each setting at different system flow rates.  To change between different sample flow settings, loosen the wheel nut and then turn the sample wheel until the appropriate setting is reached, according to the number engraved on the wheel.

 Figure_25.png

  Figure 25 - Picture of the sample introduction wheel

 

Table 1 shows the approximate sampling rates through the system with different apertures selected for a total pump flow rate of 2 slpm.  (sample flow rate + make up flow rate = total pump flow rate).  These flow rates are for sampling at atmospheric pressure, although the Lonestar can operate with a slight overpressure at the inlet (up to 2 psi). For higher pressure operation a regulated pressure step down or headspace design is required in conjunction with the inlet to enable sampling. Please contact Owlstone for sampling advice and custom sampling solutions. 

 

SAMPLE WHEEL NUMBER

SAMPLE FLOW RATE IN ML/MIN AT AN INTERNAL FLOW OF 2.0 SLPM

1

15

2

30

3

75

4

125

5

250

6

375

 

Table 1 -  Sample flows for each sample setting with system flows of 2 slpm.  These are approximate values depending strongly on the sampling technique (flow resistances will reduce the sample flow) and internal dilution settings (sample flow increases proportionally with internal flow) and should be determined with a flow meter for particular configurations. 

 

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