26
SPM Flex Gas Detector
Tubing (optional)
Sample and exhaust tubing calculations
This table shows the flow rate, tubing length, transport time, and maximum
pressure and vacuum at the inlet and exhaust points�
Allowable tubing lengths vary among gases (see ”Detectable Gases” on page
62)� If the pressure or vacuum on the inlet/exhaust lines does not meet the
recommended values, the detector may encounter flow faults� The maximum total
tubing length (inlet + outlet) is 100 ft� (30 m)�
Sample Specifications
Description Value
Inlet
Tubing length, ft. (m)
100 (30) 66 (20)
33 (10)
0
Transport time (sec)
19 13
7
1
Flow rate (cc/min.)
700-1200 (flow is set and controlled per calibration)
Tubing OD. in. (mm)
0.25 (6.35)
Tubing ID, in. (mm)
0.125 (3.18)
Outlet
Tubing length, ft. (m) 100 (30)
Tubing OD, in. (mm) 0.25 (6.35)
Tubing ID, in. (mm) 0.188 (4.76)
The overall maximum load on the pump between the inlet and the exhaust should not exceed 10 inches H
2
O.
Do not operate the detector in a positive-pressure environment� Refer to
TechNote 1998-0195 R1 Sampling Point Guidelines.
CAUTION
!
An external filter must be installed on the detector’s “in” line for most gases (see
“Detectable Gases” on page 62)� Filters can be placed either at the detector,
for local monitoring, or at the end of the sampling line, for remote monitoring� A
filter can also be installed on the exhaust port to reduce noise�
filter
push
fittings
(arrow indicates
direction of flow)
Figure 17. External lter
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