Libraries & Archives

Our involvement with library and archive conservation using market leading environmental monitoring systems has been invaluable to curators that dedicate their time to the preservation and conservation of organic materials.

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Meredith Paetz

Vice President, Business Development, USA


Measurement Types

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A solution for every library & archive application

Libraries | Archives | Books | Historical Documentation

Temperature & Humidity

Hygroscopic materials such as paper, parchment, papyrus, leather and bookbinding adhesives

Materials (as above) within libraries and archives already contain moisture and are therefore highly sensitive to drying out. In high relative humidity conditions molds thrive and appear in circular patches with a fluffy composition and produce acidic chemicals that cause further deterioration processes.

Our temperature and humidity recorder range of Hanwell Pro USB and wireless data loggers are well established and are already in use within many libraries and archives as a reliable solution to monitoring these environments. The ML4106 and ML4114 wireless data loggers provide users with accurate tools to wirelessly monitor temperature and humidity levels together. This recorded data can be used not only for alarms and historical data analysis but also to control humidifier or dehumidifier units as and when levels drift outside predetermined parameters, providing a complete solution to temperature and humidity management.

Light & UV

Pigments such as inks, paper, and other organic substances

The ultraviolet light within the sun ray or fluorescent light produces oxidation of cellulose. This reaction causes fading of papers and ink as well as further chemical reactions that can turn paper yellow or brown and separate fibers.

Hanwell Pro products provide professionals the tools to measure the levels of LUX and UV content of light and assist in determining if too much light and UV is exposed for too long.

Our range of light measurement units such as; the ML4000LUX/UV series USB and wireless data loggers can record both light and/or UV levels within an area, helping conservators for archives and libraries to ensure the correct levels of light are being maintained.

Insect Pests

Organic materials such as paper, leather, parchment, glue, and gum of bookbinding

A common problem within libraries and archives comes from irreparable loss or damage to books resulting from an attack of insect pests. This could be as a result of dust build-up or transmitted from other infested items. Termites, Silverfish, Booklice and others are all responsible for feeding on the organic materials as mentioned above.

The Hanwell Pro AnoxiBug system is a cost-effective anoxia treatment that staff can use with ease when an infestation occurs. The infested items are placed in an aluminum packet with an oxygen indicator. When the bag has been sealed the oxygen level are lowered to such a point that all insects perish. The bag and indicator can be reused for other items.

Airflow & Wind

Hallways, stairwells and other wind traps close to exits or even open areas

The external corrosion on archives and libraries caused by the wind force of rain, pollutants, and debris can have detrimental effects on the condition of the external building walls, potentially leading to internal damp and potential mold growth.

Whilst the Hanwell Pro Air-flow series can be used internally, the RL2000 can also be used on the same system for external wind speed and direction measuring wind, speed, precipitation, barometric pressure, temperature, and humidity.

Monitoring parameters within critical areas like these can prevent further damage and assist with preservation processes.

Our Wireless products are British designed, tested and manufactured in England.


Latest Case Study

Relative Humidity Monitoring at Ulster American Folk Park

Located in wetter parts of Northern Ireland, the challenge was to reduce relative humidity levels to avoid damage to collections.

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Heritage Sectors

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