GE CGA 351, Руководство пользователя

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December 2004
3-2 Operation
Powering Up the System
Before applying power, check the wiring connections and close both
enclosures. Energize the external disconnect device to power up the
CGA 351. (See page 3-8 for powering down instructions). For
reliable readings, allow approximately
two hours for the analyzer to
reach temperature equilibrium before taking measurements.
!WARNING!
To prevent corrosion, the analyzer must be powered
up immediately after introduction of the sample gas.
If the analyzer is left installed without power, the unit’s
components become susceptible to acid condensation
that will cause corrosion.
If the power must be removed for more than thirty
minutes, purge the analyzer through the inlet port
with a continuous flow of instrument air at a rate of
1,000 ± 150 cc/min (2.1 ± 0.3 SCFH).
IMPORTANT:
For compliance with the European Union’s Low
Voltage Directive (73/23/EEC), the CGA 351
requires an external power disconnect device such as
a switch or circuit breaker. The disconnect device
must be marked as such, clearly visible, directly
accessible, and located within 1.8 m (6 ft) of the unit.
User Program Security
The CGA 351 has been equipped with a User Program that permits
the setup and calibration of the instrument for optimum performance
in any specific application. However, to prevent accidental changes to
critical system parameters, four levels of security are imposed on the
various submenus within the
User Program . These are:
•
Unlocked - access to these submenus is gained simply by pressing
the
[ESC]
key. No password is required.
•
Basic (locked) - access to these submenus is gained by pressing the
[ESC]
,
[ENT]
, and
[ESC]
keys in sequence. Then, a password must be
entered. (The default password is 2719 .)
•
General (locked) - access to these submenus is gained by pressing
the
[ESC]
,
[ENT]
, and
[ESC]
keys in sequence. Then, a password must
be entered.
•
Advanced (locked) - access to these submenus is gained by
pressing the
[ESC]
,
[ENT]
, and
[ESC]
keys in sequence. Then, a
password must be entered.
Note:
The passwords required for the three locked categories
mentioned above are all different.
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