Hey all, Recently I've built a humidity chamber to test my humidity sensor. I'm very sure that my chamber that made of mild steel is free of leakage. The relative humidity (RH%) inside the chamber is monitored by a hygrometer. The various humidity values inside the chamber is produced by flowing the dry and wet nitrogen gas. My problem is when the relative humidity decreased to a value let say 30%RH, this value can not be maintained for a long time. It will increase gradually to the room humidity value. Can someone help me to solve my problem? Idris Sabtu Research Assistant National University of Malaysia _________________________________________________________________ Are you in love? Find a date on MSN Personals http://match.msn.com.my/