This chapter provides a general description of the standard CGA 351
and gives directions on how to install and wire the analyzer for proper
Note: For information regarding component locations and/or wiring
connections in an optional enclosure, see Appendix C.
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.
Power up the CGA 351 as quickly as possible 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.
Be sure to observe all installation limits and precautions described in
this chapter. Pay particular attention to the ambient temperature range
of –25 to +50°C (–13 to +122°F) specified for the instrument.
To ensure safe operation of the CGA 351, the unit must be
installed and operated as described in this manual. Also,
be sure to follow all applicable local safety codes and
regulations for installing electrical equipment.
In addition, all procedures should be performed
by trained service personnel.