Teledyne 356WA instruction manual Operational Theory

2 Operational Theory Model 356WA

voir. This places a back pressure on the sample in the cell and upper portion of the humidifier column equal to the water column from the bottom of the reservoir to the water level in the reservoir. Thus, the water level in the humidifier column is held even with the sample connection at the bottom of the reservoir. There will be a slight additional pressure in the top of the humidifier column depending on the flow rate (the pressure needed to push the sample through the cell and associated tubing), but at normal flow rates this merely slightly lowers the level in the humidifier column.

The sample bubbles through the water in the reservoir on its way to the outlet port. Some of the water vapor will re-condense, so that the sample flows out of the outlet port saturated at the reservoir temperature, which is slightly above ambient. The sample bubbling through the make-up water will scrub out any oxygen which may be dissolved in it. This assures that the sample will not pick up any oxygen as it passes through the humidifier column.

2-4 Teledyne Analytical Instruments