Museum display case with improved relative humidity control and related control method

A display case for preserving and displaying objects in a protected environment, comprising

• a display space, delimited by separating walls comprising a lower plane and side walls, and
• means for adjusting and controlling air climate in the display space, comprising:
• a hygrometric probe for detecting the relative humidity inside the display space,
• a control unit connected to the hygrometric probe, and
• a first relative humidity control electrolytic membrane, located in one first opening formed in one of the separating walls, activated by the control unit;
• wherein:
• the means for adjusting and controlling further comprises a second relative humidity control electrolytic membrane located in a second opening formed in one of the separating walls and activated by the control unit,
• the first electrolytic membrane is mounted in the first opening with a dry side thereof inwardly oriented in the display space while the second electrolytic membrane is mounted in the second opening with a humid side inwardly oriented in the display space,
• the first electrolytic membrane and the second electrolytic membrane are alternatively activated by the control unit for determined time ranges based on relative humidity values detected by the hygrometric probe, and
• each of the two openings is provided with a shutter movable between
• a closed position wherein the shutter closes the opening when the electrolytic membrane in such opening is not activated and
• an open position wherein the shutter leaves the opening open when the electrolytic membrane in such opening is activated.