SAMPLE GAS DEHUMIDIFIER DH6 Manual, Rev. 10/2020
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General Description
The DH6 electric cooler/dryer is a flow-trough cooling device for removing water vapor (or oth-
er vapors) from a sample gas e.g. for photometric measurement of its ozone content. The heat
exchanger is a perpendicular oriented SS tube, cooled from the outside by a Peltier-electric cool-
ing system. The temperature of the inner surface of the tube is automatically controlled to a tem-
perature which can be set between 1ºC and 15°C.
The DH6 is a box about 279x140x64 mm (HxDxW) standing upright on one "leg" (upright posi-
tion is inevitable because the condensate formed inside the cooler has to flow back into the off-
gas system). On top of the reaction vessel, or in a large diameter off-gas tube, the "leg" is plugged
into a big SS fitting with PTFE seal. The fitting can be screwed into a 3/8" NPT threaded bore
hole, or it can be welded into a bore hole 17 mm ID. A PVC plug is provided to tightly close the
fitting when the dryer has to be removed for service or repair (this plug is permanently fixed to
the mounting fitting by a thin SS stranded wire). When the off-gas is at a significant overpressure
an (optionally available) shut-off ball valve should be used.
DH6 with SOBV (shut-off ball valve)
DH6