14 DF-745SG
Installation, Start Up and Shut Down
4.1.2 Sample Gas Connections
4.1.2.1 Sample Gas Inlet Connection
Sample gas is connected to the analyzer via a ¼ inch male swivel VCR fitting
labeled Process Inlet at the rear of the instrument as shown in Figure 3. Sample
pressure of 30 – 150 psig is required and is regulated internally.
Pre-purge the line by connecting to the analyzer (with a new VCR
filter
gasket)
only finger tight and flowing gas for 15 minutes. Then tighten the inlet fitting.
NOTE: A VCR
filter
gasket (supplied) should always be used to protect the gas
delivery system from any particulate matter that may have collected in the line.
When power is applied to the analyzer, the internal gas control valves will
automatically go to a state as determined by the user. See the section on Power Up
Defaults on page 60 for additional information.
NOTE: When received from the factory, if equipped with internal gas valves, the
moisture cell will be isolated with pressure in the system. See the sections on
Moisture Gas Valves Control on pages 37 for instructions on starting the gas flow
through either sensor.
See Figure 8 for an overview of the gas flow through the analyzer.
See the section on Gas Pressure and Flow Settings on page 18 for important
information on plumbing and powering up the analyzer.
PROCESS OUTLET
PROCESS INLET
NOT USED
5
5
RLY4-COM
RLY2-COM
RLY1-COM
RLY1-NO
RLY1-NC
KEY
4
4
RLY3-NC
1
2
3
KEY
3
2
1
RLY3-COM
RLY3-NO
RLY2-NO
RLY2-NC
GND
8
6
7
GND
8
7
6
RLY4-NO
RLY4-NC
RX+
TX+
3
3
1
2
1
2
4-20mA-
4-20mA+
TX-
GND
RX-
KEY
8
7
6
4
5
KEY
GND
8
7
6
4
5
AOUT-
AOUT+
~
~
~
~
~
~
Figure 3: Rear Gas Connections
Содержание NanoTrace DF-745SG
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