Installation instructions for Custos Aeris Custos Aeris was developed in such a way that installation and mounting of the dew point monitor can be realised quickly and easily. Particularly important here is that no power supply cables and no sensor cables have to be laid. The sensors are integrated in a main module and an air gap module. The built-in rechargeable battery allows the system to run for at least one year and is constantly recharged by sunlight in favourable conditions. Communication takes place via the mobile network, just like with a mobile phone, and the data is stored in the cloud once a day. There, the data can be viewed at any time via a web browser. The following picture shows a cross-section of the structure in a typical situation of protective glazing and historically valuable lead glazing: The main module is clipped into the cover rail towards the interior and the air gap module is located in the space between the protective glazing and the lead glazing and i...