Rosemount 7D, Инструкция по эксплуатации

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I
NSTALLATION
748221-L Rosemount Analytical December 2000 7
Model 7D Thermal Conductivity Analyzer
WARNING: POSSIBLE EXPLOSION HAZARD
2.2 UNPACKING
The Model 7D Thermal Conductivity Analyzer is a precision instrument and should be
handled carefully. Carefully examine the shipping carton and contents for signs of
damage. Immediately notify the carrier if the carton or its contents are damaged.
Retain the carton and packing material until the instrument is operational.
2.2.1 G
AS
R
EQUIREMENTS
G
ENERAL
The Model 7D requires cylinder gases appropriate to the particular application (refer to
the Data Sheet inserted in this manual). Suitable gases are available from various
suppliers.
2.2.2 C
ALIBRATION
G
AS
R
EQUIREMENTS
For calibration, the analyzer requires a downscale and an upscale calibration gas,
both normally specified in the Data Sheet. Proper choice of calibration gases for a
particular application depends on the composition of the sample stream and the
operating range used.
S
AMPLE
G
AS
C
OMPOSITION
In a typical application, the sample gas consists of two components, for example:
hydrogen in nitrogen. In this example, hydrogen is designated the “measured
component” and nitrogen constitutes the “background gas.”
S
UPPRESSED
-Z
ERO
R
ANGES
With any zero-suppressed range, the zero-concentration point for the measured
component lies offscale, below the lower range-limit. A typical example is 80% to
100% hydrogen in nitrogen. Here the appropriate upscale calibration gas would be
pure hydrogen. The downscale gas would have a composition appropriate to
establishing a calibration point slightly above the lower range-limit e.g., 81% hydrogen
in nitrogen.
This analyzer is of a type capable of analysis of sample gases which may be
flammable. If used for analysis of such gases, the instruments explosion-proof
enclosure must be suitable for the gas.
If explosive gases are introduced into this analyzer, the sample containment
system must be carefully leak-checked upon installation and before initial
startup, during routine maintenance and any time the integrity of the sample
containment system is broken, to ensure the system is in leak-proof condition.
Internal leaks resulting from failure to observe these precautions could result in
an explosion causing death, personal injury or property damage.