Delta Faucet DF-745 Manuel D’Utilisation
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.
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.
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.
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.
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.