3 Installation | Model 3300TB |
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3.4.1 Vacuum Service Option
For vacuum service pluming reference figure 3-4. The vacuum service option is recommended for applications in which the sample source is not pressurized. The customer must supply a pump and by-pass system to complete the sample system. The sample inlet and outlet pressure must be maintained at a constant pressure for proper performance. If the sample inlet or vent pressure will not be held constant during the process, a pressure regulator must be used to regulate the pressure across the cell.
Adjust the flow rate on a vacuum service system as follows:
Select Sample with the three-way control valve and open the flow control valve on the analyzer to full flow (located on the analyzer flow meter). Open the pump by-pass valve, and turn on the pump. Readjust the pump by-pass valve to limit the maximum flow rate to full scale on the flowmeter with the flowmeter valve fully open. Adjust the analyzer flow control valve (flowmeter valve) to a flow-rate of approximately 2 SCFH). Select Span and verify that the span and Sample gas are at different pres- sures. The calibration accuracy will be adversely affected if the Span and Sample gases are at differing pressures.
If the span gas is provided from pressurized source, a control valve must be added between the analyzer and the span gas source. This valve is used to adjust the span flow rate to match the sample flow rate. Do not adjust the span flow rate with the flow control valve located on the analyzer for units with vacuum service options.
Customer Supplied Parts
Figure 3-4: Piping Diagram for Vacuum Service Option
3-6 | Teledyne Analytical Instruments |