Delta Faucet NANOTRACE DF-745 - Manual (Page 18)

14 DF-745 Installation, Start Up and Shut Down
4.1 Analyzer Installation
4.1.1 Vacuum Source
4.1.1.1 Aspirator
The standard vacuum source provided with the DF-745 analyzer is a factory installed
aspirator as shown in Figure 3. Aspirator installation with the optional gas panel is identical.
SAMPLE VENT
80 psi IN
ASPIRATOR
Figure 3: Aspirator Installation
A regulated source of dry compressed gas (either N2 or air) is required at 80psi 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 2.0 psi) 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.