Servomex NanoTrace DF-760E, Instruction Manual

Page: 29 / 182

Installation, Start Up and Shut Down DF-760E 25
4.1.6 Pneumatic Pressure Line Connection
The pneumatic gas connection is a 1/8 inch compression fitting as shown in Figure 4 and
requires 70 – 100 psig (4.8 - 6.9 barg) air or N2 pressure. For ease of installation, the
pneumatic feed line can be connected directly to the ¼ inch aspirator source by way of a
1/8 inch adapter.
4.1.7 Sample Gas Connections
4.1.7.1 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 4. 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 109
for additional information.
NOTE: When received from the factory, the oxygen sensor and moisture cell will both be
isolated with pressure in the system. See the sections on Moisture and Oxygen Gas Valves
Control on pages 48 and 72 for instructions on starting the gas flow through either sensor.
See Figure 7 for an overview of the gas flow through the analyzer.
See the section on Gas Pressure and Flow Settings on page 29 for important information on
plumbing and powering up the analyzer.
For the specific instance of measuring moisture in a background gas of
pure Oxygen, it is imperative that the Oxygen sensor not be exposed to the
process gas. The Oxygen sensor is not designed for use in a pure Oxygen
background.
4.1.7.2 Sample Gas Outlet Connection
The sample gas outlet connection is a ¼ inch compression fitting labeled Moisture Sensor
Outlet as shown in Figure 4. A ¼ inch stainless tube is connected from the analyzer
sample outlet to the Aspirator assembly. See Figure 3. The Oxygen and bypass outlet are
vented separately.
Open the needle control valve (CCW) on the top of the aspirator assembly
completely.
NOTE: If the Hydrogen Service Safety System is included, the sample outlet line must be
made of steel. See page 173 for additional information.
See page 35 for information on the installation of the optional vacuum pump.