Delta NANOTRACE DF-745 Instruction Manual download pdf (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.

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Delta NANOTRACE DF-745 Instruction Manual Page 18