A: Attached below is the typical piping diagram for the sample system utilized upfront of the Total Sulfur System. The inlet delivery pressure is going to vary from site to site depending upon what pressure drops you may have upfront of the Model 6200E. The inlet sample pressure should normally be reduced at a pressure of 1 to 2 psig, just upfront of the 6200E, as the vacuum pump is designed to draw the sample gas in at atmospheric pressure.
What you need to protect against is the pump sucking in ambient air through the bypass leg - which is venting to atmospheric pressure. If this occurs, it will serve to dilute the sulfur content in the CO2 and the unit will report a false, low reading.
Make sure you have positive flow through the bypass leg under these low pressure conditions and you are achieving the suggested sample flows. If you aren't getting sufficient flow through the bypass leg, then slightly increase the inlet sample pressure taking care not to overpressurize the 6200E. If you do overpressurize the sample system, I am told by Ilian that you will typically take out the connector at the quartz tube in the thermal converter. You'll hear a "pop" which you obviously want to avoid.
6200E_sample_system.pdf
