Sample Gas Requirements/Connection; Calibration Setup - Ametek Thermox CEM/O2 User Manual

Sample Gas Requirements/Connection

Figure 3-1 shows the inlet and outlet ports on the CEM/O
sample gas should be clean and dry. If the sample contains any condens-
ing moisture, the entire sample line should be heat traced.
The sensor may operate at a steady internal pressure up to 20" WC (5
kPa). Outlet restrictions that raise the pressure beyond this level may
cause false or unstable readings. The sample gas flow rate must be be-
tween 2 and 20 SCFH (0.94 to 9.4 L/min). The maximum sample tempera-
ture is 200°C (392°F).

Calibration Setup

Figure 3-1 shows the location of the inlet port on the CEM/O
When calibrating your system, you will connect calibration gases up-
stream of this inlet port.
Required calibration gases and tubing
Use calibration gases at between 2 and 20 SCFH (0.94 to 9.4 L/min). Also
be sure that you use the same flow rate for calibrations and daily opera-
tions.
The span gas must be a higher oxygen content than the zero gas by a fac-
tor of 10 for example, if zero gas is 1.0%, span gas must be 10% or higher.
If zero gas is .1%, span gas must be 1% or higher).
Span gas - instrument air (20.9%) or from 1.0% to 100% O
Zero gas - from .1 to 10% O
Always use tubing that is free of oil and dirt.
, balance N (2% is recommended)
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Installation and Start-up
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