15
3103-1001 Rev. 0
Table 3.1: Sample Transport Times
(0.175" ID Tubing, bypass flow switch set @ 8 CFH)
50 ft.
4 sec.
300 ft.
23 sec.
100 ft.
8 sec.
350 ft.
27 sec.
150 ft.
12 sec.
400 ft.
30 sec.
200 ft.
15 sec.
450 ft.
34 sec.
250 ft.
19 sec.
500 ft.
38 sec.
Sample Transport Time (sec) = 0.075 X Length of
0.175"
ID Tubing (ft.)
For applications involving gases not compatible with the standard tubing, the recommended tubing is
3/8" OD, 1/4" ID Teflon lined polyethylene tubing (MSA part number 655163). The Flow Diagram
will indicate the part number for the recommended tubing for your system.
Sample Transport Time (sec) = 0.173 X Length of
0.250"
ID Tubing (ft.)
When using tubing other than the recommended tubing, use the following formula:
Sample Transport Time (sec) = Volume of Tubing (cu ft) X 3600 sec/Hr
Bypass flow switch trip point (cu ft / Hr)
NOTE: Sample line tubing with an inner diameter less than 0.175" will restrict flow below the flow
rates recommended for this system. Use of this tubing will place additional limitations on the
maximum sample line length and is therefore not recommended.
The bypass flow switch is a true indicator that the sample line flow is in excess of the trip point. The
bypass flow switch is factory set to close at 8 SCFH increasing.
Use only sample stream compatible materials in the sample flow system to ensure accurate gas
samples are delivered to the unit.
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