Hazardous Area
X-STREAM O
2
Transmitter
2-4
Instruction Manual
IM-106-910C, Rev. 1.0
November 2009
HAZARDOUS AREA
CONSIDERATIONS
The Hazardous Area X-STREAM O
2
probe system (Figure 2-2) is an in-situ
device. The process end of the probe places a heated (736°C) sensing cell
directly into the process; usually the flue gas duct downstream of a
combustion process. The electronics end of the probe remains in the ambient
environment outside of the duct.
Figure 2-2. In-Situ Probe
Orientation
The instrument is configured in two versions. One version (XS-O2XPFA)
includes a process-side flame arrestor in front of the heated sensing cell and
is approved as follows:
• FM to NEC Class I, Zone 1, AEx d IIB +H2 T3 (US)
• FM to NEC Class I , Div. 1, Group B, C, D T3
• ATEX to Class I, Zone 1, Ex d IIB + H2 T3 (EU)
The second version (XS-O2XP) does not use the process-side flame arrestor.
It carries the following approvals:
• CSA to NEC Class I, Zone 1, AExd IIB + H2 T3 (US)
• CSA to NEC Class I, Zone 1, Ex d II B + H2 T3 (Canada)
• ATEX to Class I, Zone 1, Ex d IIB + H2 T3 (EU)
This version of the probe is to be used in situations where the process flue
gases are not considered to be hazardous.
Note that the hot sensing cell is controlled to 736°C (1357°F) and should be
considered as a potential ignition source if an explosive gas mixture is
permitted to come into contact with the hot cell. Rosemount Analytical
recommends consulting with National Fire Protection Agency NFPA 85
recommendations for a systemic approach to furnace protection.
The Hazardous Area X-STREAM Xi electronics offers an optional feature that
provides power to the probe heater via an external contact from a flame safety
or burner management system.
The X-STREAM Transmitter is rated T3, meaning that the probe mounting
threads or flange does not exceed 200°C (392°F). (Process side flange
maximum temperature 200°C [392°F]).
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