Mounting the Model CGA This section explains how to mount the analyzer components at the
351 installation site and how to connect the sample system to the analyzer.
Note: If more than one analyzer system is being installed, be aware
that each system is a matched set (i.e., each sensor enclosure
must be matched to a specific electronics enclosure). Refer to
the identification tags on the enclosures to match the systems
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.
IMPORTANT: This symbol indicates Caution - risk of electric
Refer to Figure 2-1 on page 2-9, and complete the following steps to
mount the CGA 351:
1. Select a flat surface on a vertical wall or instrument panel with
sufficient space to hold the mounting plate with both of the CGA
Note: Mount the system in an upright position, so that the sample
inlet and outlet fittings are on the bottom of the sensor
2. Using the mounting dimensions shown in Figure 2-1 on page 2-9,
locate and prepare four (4) mounting holes or two (2) horizontal
mounting rails on the vertical surface.
3. Secure the system to the mounting surface with four (4) sets of
mounting hardware. Be sure that the enclosures are in a vertical
position, with the inlet/outlet connectors on the bottom.
4. The flowmeter, which is fastened to the right side of the sensor
enclosure, is connected to the discharge port on the bottom of the
unit with a length of 6mm stainless steel tubing. Make sure that
the factory-installed Swagelok fittings are secure.
5. A flow control valve is attached to the inlet port on the bottom of
the sensor enclosure with 6mm stainless steel tubing and
Swagelok fittings. Point the valve in the proper direction to
receive the inlet piping from the sample system, and securely
tighten the fittings.