Options DF-310E 21
If the stainless steel outlet option is ordered with a low flow alarm, the flow
switch is mounted in the sample outlet line as part of the sensor assembly. A
2-pin connector is used to disconnect the switch from the analyzer.
5.4 Flow Control Valve
The upstream flow control valve is mounted behind the door and below the
Flow Indicator. It may be used to control the gas flow rate in positive pressure
installations where the inlet pressure is less than 5 psi. In addition, it may be
shut off to isolate the analyzer from the gas stream.
5.5 Filter
The filter assembly is installed at the factory when ordered with the Analyzer.
However, a filter assembly may be purchased later and installed by the user.
It is mounted externally on the back panel as shown in Figure 8. The option
includes a bracket and preformed tube with fittings to connect the filter outlet
to the Analyzer inlet. The back panel of the Analyzer has three PEM nuts for
mounting the filter bracket. Use the screws supplied with the PEM nuts.
Two grades of filter elements are available for the filter:
Fine grade (BQ) (< 1 micron)
Course grade (DQ) (> 1 micron)
The course grade is normally supplied. See page 96 for ordering information.
Note: The filter has two ports labeled 1 and 2. For particulate removal
plumb the filter with port 2 connected to the Analyzer's sample inlet fitting.
For mist coalescing and collection for draining, plumb the filter with port 1
connected to the Analyzer's sample inlet fitting.
5.6 Pressure Regulator
The gas pressure regulator is installed at the factory when ordered with the
Analyzer. However, a gas pressure regulator may be purchased later and
installed by the user. It is mounted on the back panel as shown in Figure 9.
The option also includes a preformed tube with fittings to connect the
regulator outlet to the Analyzer inlet. The back panel of the Analyzer has
three PEM nuts for mounting the regulator bracket. Use the supplied screws
with the PEM nuts.
Note: If the analyzer is equipped with a VCR welded sample inlet connection,
there is a .010 inch orifice at the inlet to the sensor which requires 15-20 psig
of pressure.
NOTE: For additional information on the proper purging of regulators after
installation see page 37.