Product Details

The Sample Gas Dehumidifier DH6 is a flow through cold trap for removing water vapor (or other vapors) from a sample gas e.g. before photometric measurement of its ozone content. The heat exchanger is a perpendicularly oriented stainless steel tube, cooled from the outside by a Peltier-thermoelectric cooling system. The temperature of the tube is automatically held constant at a temperature of 1 to 15 ºC. This temperature setpoint can be manually set by the user. The actual temperature is shown continuously by a digital display. The inner surface of the tube can be covered with a thin PTFE layer to protect delicate gases from getting in contact with the stainless steel tube (model DH6-LC, for dehumidifying very low concentrated ozone gas). The tube has to be fitted tightly into the reactor vessel from which the sample gas has to be withdrawn. When the sample gas (typical flow rate 0.3 to 0.5 l/min) is passing the tube upwards, the water vapor will condensate on the cold inner surface of the tube. The condensate now will flow back into the reactor vessel (see drawing next page). The Sample Gas Dehumidifier DH6 thus avoids mechanisms which otherwise would be necessary for removing the condensate from the cooler (dryer) from time to time.

For mounting, the dryer is delivered together with a SS Swagelok fitting (ID 12 mm, 3/8" NPT thread, with PTFE seals), which accepts the DH6 to be plugged in for easy removal. A shot-off ball valve SOBV can be provided as an option. Cleaning of the gas path is possible from the top. A screw driver for setting the desired temperature is provided.