Programmable Humidity Chamber has two sets of controls featuring proportional, integral and derivative parameters. It also has reset windup inhibit and reset clipping facilities. This control system provides control setting and indication resolution of 0.1° and +/- 0.1% relative humidity. This controller has 200 program steps for up to 99 recipes and 16 programmable events. A host computer is used to communicate with the programmer. All recorder functions can be easily configured through the keys on the front panel. The special swing-out mounting bracket allows the recorder/controller to be pivoted from the side of the control compartment to the front if desired. The high efficiency air circulation system is delivering horizontal airflow that is an integral part of chamber construction. This direct drive design has an extended shaft electric motor coupled to a stainless steel centrifugal blower wheel.