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Museum Verifies Climate Control Using Temperature Loggers

HOBO Bluetooth Data Loggers Protect Artwork


Used with permission from Onset Computer Corporation Environmental control is a unique challenge at the Hunter Museum of American Art in Chattanooga, Tennessee, which houses objects made from a variety of different materials. This includes paintings, sculpture, photography, mixed media, furniture, works on paper, and contemporary studio glass.

Another key challenge is balancing the optimal conditions for preservation and those for occupant comfort. Chattanooga's summer heat and humidity require the managers to be extra vigilant about climate control in each of their three buildings.

The Hunter Museum is a 77,000 square foot facility perched on an 80-foot bluff overlooking the beautiful Tennessee River. Established in 1952, the museum features an extensive collection of American art ranging from the Colonial period to the present. The museum complex is comprised of three unique yet interconnected structures constructed in 1905, 1973, and 2005, representing 100 years of architecture. Each building reflects the tastes and technology of the time in which it was created.

To preserve its assets, the museum needs to maintain a stable interior climate and to prevent unfavorable environmental conditions which can harm objects and cause deterioration. In particular, Temperature and Relative Humidity (RH), must be closely controlled and kept at suitable levels (temperature of 68° to 72°F, and RH of 50% with +/- 5% fluctuation). These parameters are significant because warmer temperatures can cause heat damage to certain objects, and high RH levels can bring about mold formation and cause objects to corrode, warp, crack or cockle.

Since manual data collection is very time-consuming and retrieval is difficult due to all the individual records, the museum's curators looked for a more optimal solution.

Environmental Monitoring Solution:

To achieve greater environmental control at the Hunter Museum, registrars Elizabeth Le and Theresa Slowikowski, responsible for implementing procedures relating to the care of the facility's permanent collection, rely on an internal climate-control computer system. This system also documents and stores all historical data, such as temperature and humidity readings.

However, when the museum recently requested an exhibition from a major museum, the registrars realized they had a problem. The lender required three years of climate-control readings before agreeing to loan out its exhibition. The registrars found that although the climate control portion of Hunter Museum's system was working perfectly, the data recording portion was malfunctioning and data was only being saved for two weeks!

The company that installed the environmental system informed them that data recording portion of the system could not be repaired. "To correct the problem, we were faced with purchasing a whole new system that we could not afford," said Le. "What's more, a new system was not necessary since the climate control portion was functioning perfectly. At the time, the building maintenance staff had no choice but to manually record temp and RH data every two weeks to begin building up years of data history."

Slowikowski and Le were familiar with Onset HOBO® dataloggers since they had successfully used older models in the past. Ultimately they chose to purchase and install HOBO® MX1101 Bluetooth Temperature and Humidity loggers in their galleries. These loggers, which leverage cutting-edge Bluetooth Smart technology, continuously measure and record temperature and RH around the clock, enabling the curators to download the readings wirelessly from up to 100 feet away with just a smart phone or tablet.

Data Collection and Analysis:

The Bluetooth Smart loggers provide the Hunter Museum with a number of advantages. First, they eliminate the time and costs otherwise spent on manual data collection, and collect data when and where it is needed. Additionally they generate audible and visual alarms to notify staff of potential problems so that they can immediately take corrective actions to protect the artwork.

"We have to keep every data record and monitor any extreme changes," said Slowikowski. "If there's a paper buckle or a ripple, we can narrow down the cause with the assistance of the HOBO."

When one of the museum's glass sculptures began to develop a small crack, she explained, one of the loggers was strapped directly onto its pedestal. The registrars used data from the logger to prove that current environmental conditions for the sculpture were in standard ranges, and the crack was most likely caused by an inherent flaw. The museum was able to document their analysis and also to provide detailed measurement readings to use in considering the cause and repair of the crack.

Secondly, the devices can be deployed in hard-to-access locations if necessary, including storage areas and inside display cases, making access to the data very straightforward and convenient using mobile devices.

"We have three different buildings on the property, all interconnected, and each with its own climate control needs," said Le. "With the mobile app, I can retrieve the data I need instantly from each HOBO location, using my iPod."

Climate Control Verification:

"Having worked at the Hunter Museum for 20 years, Ms. Le and I have witnessed the evolution of data logging technology," said Slowikowski. "We've come a long way from using hygrothermographs in the 1990s, when data logging involved round paper charts on rotating metal drums. The HOBOs are such an advancement and an important tool for us. We are very happy to have them."

Finally, the loggers provide evidence of the environmental date submitted in the Facility Report, a document adopted by the American Alliance of Museums when applying for and receiving exhibits and loans.

"Now with the HOBOs in place, we have both historical data and real-time data at our fingertips," said Le. "We are hosting a Monet exhibit at the museum this June, and the lenders know it will be in good hands."

To learn more about the bestselling Onset HOBO dataloggers, or to find the ideal solution for your application-specific needs, contact a CAS Data Logger Applications Specialist at 800-956-4437 or visit our website at

Contact Information:

CAS DataLoggers, Inc.

8437 Mayfield Rd.

Chesterland, Ohio 44026



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