Envent Engineering Ltd. Page 15 Revision 2.4
Figure 4. 331S Recommended Venting for 331S (Same for 330S model)
Sample Volume & Flow Rate
The sample should be supplied to the 330S/331S H
2
S analyzer at 10-15 psig and at a
flow of 83.63 cc/min (set flowmeter at 2.0). A bypass sweep is recommended to
reduce sample lag time in the sample line if it is at high pressure or it is longer than 15
feet (The Standard H
2
S conditioning sample system has a bypass sweep). The
standard sample tubing material is 1/4" 316 stainless steel; however, 1/8" stainless
steel tubing can be used if the response time is critical (refer to Table 2).
Tube
Size
(")
Tube
Gauge
ID (") ID (cm) Flow
(SCFH)
Flow
Std.
(cc/min)
Pressure
(PSIA)
Lag
Time per
100' (min)
Lag
Time per
100' (sec)
3/8 20 0.319 0.810 5 2359 800 36.30 2178
3/8 20 0.319 0.810 5 2359 200 9.07 544
3/8 20 0.319 0.810 5 2359 50 2.27 136
1/4 20 0.181 0.459 5 2359 800 11.69 701
1/4 20 0.181 0.459 5 2359 200 2.92 175
1/4 20 0.181 0.459 5 2359 50 0.73 44
1/8 20 0.081 0.205 5 2359 800 2.34 140
1/8 20 0.081 0.205 5 2359 200 0.59 35
1/8 20 0.081 0.205 5 2359 50 0.15 9
Table 2. Sample Volume and & Flow Rate
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