Teledyne 3300PA operating instructions Vacuum Service Option

Percent Oxygen Analyzer Installation 3

atmospheric pressure. Restricting the sample vent line will result in pressur- izing the sensor and altering the O2 reading.

The pressure required will depend on the sampling system. When venting into a constant pressure, such as the atmosphere, controlling input pressure is simple. If you are venting into a system of varying pressure, then some form of pressure regulation is required.

Figure 3-3: Piping Diagram

(standard piping diagram for positive pressure service)

3.4.1 Vacuum Service Option

For vacuum service plumbing 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 bypass 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 bypass valve, and turn on the pump. Readjust the

Teledyne Analytical Instruments 3-5