Metrohm NIRS XDS Process Analyzer – SingleFiber - Manual (Page 25)

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Safe Pressure
Flow Rate
(both System Types) US: 0.31 to 11 SCFH
Metric:
0.15 to 5.2
NL/Minute
¼” FPT
NOTE: Large supply lines are recommended to permit adequate airflow. Some loss will occur due to
internal friction. Use ½-inch to 1-inch (12mm to 25mm) supply lines.
3.7.1 Terminology
SCFM:
The term SCFM stands for Standard Cubic Feet Per Minute, referenced to a pre-specified pressure,
temperature, and relative humidity. In most cases, SCFM is referenced to 14.7 PSIA, 68°F, and 0%
relative humidity. By specifying these parameters, the mass flow of compressed air and gas systems is
clearly defined.
NOTE:
Be sure that SCFM is correctly converted to Actual CFM. The equivalent information applies to Metric
flow rates also.
PSI:
Pounds per square inch - PSIA refers to “absolute pressure.”
Conversion factor: 1 PSI = 0.07031 kg/sq. cm
FPT:
Female Pipe Thread (US), NPT tapered thread. The Metric types are either PG (European Standard) or
BSPT (British Standard Pipe Taper). Adapters of the correct thread type must be used where required,
or the seal will not be maintained. Teflon® tape must be used on the threads for a good seal.
3.8 I/O Connection
UTP Crossover Cable, Category 5, RJ-45 connection
3.9 Scan Range
The Data Collection Method (DCM) selection range is:
PbS detector: 800-2500nm. The actual usable range depends upon fiber length. In Performance Test,
ranges are as follows:
• Reference Channel: Performance Test range 850-2200nm
• 0-3 meter length: Performance Test range 850-2200nm
• 4-6 meter length: Performance Test range 850-2200nm
• Over 6 meter length: Performance Test range 850-2100nm
The test ranges used in Performance Test are somewhat narrowed due to detector and fiber
attenuation parameters.