Emerson Rosemount X-Stream Series, Инструкция по эксплуатации

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Emerson Process Management GmbH & Co. OHG
1-8
X-STREAM XE
Instruction Manual
HASXEE-IM-HS
10/2012
1.2.6.7 Optional Heated Area
The physical components can be optionally
separated from the electrical components
by means of a special box (not an option for
½ 19 in units). This can be done for one or
both of the following purposes:
Firstly, the box allows the physical compo
-
nents to be regulated to a temperature of
approx. 60 °C, avoiding condensation of
gases or minimizing the influence of varying
environmental temperatures.
Secondly, the box can be purged with, for
example, inert gas (enclosure purge). The
purge gas is first fed through a separate fit
-
ting, purges the electronic components, then
floods the box and leaves the instrument via
another fitting.
Purging in this manner can be useful when
measuring very low concentrations (e.g. of
CO or CO
2
): the expulsion of ambient air
avoids adulterant outside influences.
Alternatively, enclosure purging can be used
to secure enhanced protection for electronic
parts and operators from corrosive or toxic
gases: any leaking gas is expelled from the
housing and does not escape into the vicinity
of the unit or come into contact with any elec-
tronic components located outside the box.
In either case, the purge gas outlet should be
connected to an exhaust gas line.
Fig. 1-2: Optional Heated Area
The figure shows the heated
area with the insulating cover
removed.
Isolating cover
Physical
components
(example)
Heated moun-
ting panel
Cable support for
signal wires
1.2
Configuration of
Gas Lines