Servomex NanoTrace DF-760E, Instruction Manual

Page: 28 / 182

24 DF-760E Installation, Start Up and Shut Down
Figure 3: Aspirator Installation
A regulated source of dry compressed gas (either N
2
or air) is required at 80 psi (5.5 barg)
and a flow rate of approximately 15 slpm. Connection is made to the aspirator by way of a
¼ inch compression fitting labeled “80 psi IN”. It is very important to note that the
diameter of the gas supply line must be a minimum of ¼ inch to provide sufficient flow. If
operation in Helium background is anticipated, a shut off valve should be installed at the
inlet to the aspirator.
For ease of installation, the aspirator source can also supply the pneumatic gas inlet by way
of a 1/8 inch adapter.
The gas at the sample vent port is comprised of the analyzer sample gas and the
compressed gas, and any noise can be mitigated by simply installing a ¼ inch tube of
approximately 3 ft in length. Backpressure should be minimized at this port (max 1.0 psig)
and if the exhaust must be vented for safety reasons it must be done to a header of greater
diameter.
The aspirator needle valve should be opened (CCW) completely.
Be sure to use a backup wrench when making all connections to the
aspirator.
4.1.5.2 Vacuum Pump
An optional vacuum pump can be purchased for those cases where there is insufficient gas
pressure or flow to operate the aspirator, or when the analyzer is installed in a portable cart
and connection to a continuous gas supply is inconvenient. See page 35 for information on
the installation of the optional vacuum pump.
SAMPLE VENT
80 psi IN
ASPIRATOR