How to Conceal Temperature and Humidity Sensors in Cultural Spaces

The tension of environmental monitoring is familiar to any conservator or collections manager who has installed a sensor in a gallery: the readings tend to be in the areas or near the artifacts where visitors are most likely to look, yet the tool gathering those readings should not become part of clutter a visitor sees. A monitoring device that draws the eye potentially compromises the user experience.

Before placing a sensor anywhere, it helps to spend a few minutes observing the space the way a visitor would, noticing where the eye travels and where it comes to rest. Attention in a gallery often follows the objects on display and tends to pass over the surfaces and recesses around them. That tendency is useful because the areas just outside a sightline are often effectively invisible without being physically obstructed, such as the underside of a shelf, the shadowed return of a case, or the narrow gap behind a mount. 

"Environmental monitoring, especially temperature and humidity, is critical to give conservators the data they need to make informed decisions about the care and treatment of objects,” says Boris Pretzel, Heritage Science Advisor at Bev/Art and former Head of Science at the Victoria & Albert Museum. “Collecting robust data is the most important priority, but it is not in conflict with the user experience. Whether by smartly hiding sensors or selecting more discreet ones, function and experience can coexist.”

Once locations are identified, the surrounding environment usually offers everything needed to keep the sensor out of view. If further concealment is needed, there are options.

The Bev/Art temperature and humidity sensor, about the size of a LEGO® brick, discreetly placed near a collection.

For example, placing the object behind a length of display cloth, beneath a fabric-lined case liner, or within the folds of a costumed mannequin reads the surrounding air while remaining entirely obscured. The most important consideration that governs success here is airflow. A sensor must sample the same air the collection is exposed to, which means it should never be wrapped tightly or sealed into a pocket where it generates its own small, misleading microclimate. A loose drape or an open-backed fold allows air to move freely without interrupting the line of sight.

Another consideration is how a sensor is secured in place. Hook-and-loop fasteners such as velcro are a dependable option. They hold reliably, release without residue or surface damage, and permit repositioning as displays change over time. A short strip is generally sufficient and because the attachment is fully reversible, it honors the foundational obligation of work around cultural material, which is to leave no trace.

Certain shortcuts are common but should be avoided. For example, mounting a sensor magnetically can interfere with the device's internal components and invalidate its measurements. Whatever convenience a magnet offers does not make up for potentially corrupted data. The safest practice is to keep sensors and other monitoring equipment away from magnets. 

Painting a sensor to match a wall or coloring it with markers should also be avoided. Coatings and inks can obstruct the ports through which the device samples air, trapping moisture against the housing and distorting humidity readings in particular, and they frequently void the instrument for any future use. Furthermore, these materials release harmful chemical fumes as they dry, which can permanently ruin the delicate internal humidity sensor. 

"The collection should speak for itself without the visual interruption of monitoring equipment," says Christian Nielsen, Co-Founder and COO of Bev/Art. "The smaller and less obtrusive the device, the fewer compromises a conservator has to make between understanding an environment and preserving the visitor's experience of being in it.”

Good environmental monitoring should be invisible to the visitor and reliable to the conservator. Reading sightlines, using existing surfaces, securing with reversible fasteners, and avoiding shortcuts like magnets or paint all serve the same end: accurate data and an undisturbed space. A smaller sensor and one offered in both a light and dark color option widens the margin, leaving fewer compromises to make between understanding an environment and preserving the experience of it.