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Original PEM
The original Preservation Environment Monitor, or PEM, is a battery-powered temperature- and RH-measuring device for monitoring the storage and display conditions in cultural institutions.
The PEM has unique features for preservation use. It calculates and displays, in real time, values that reflect the decay rate of organic materials stored in a given location. These values, known as preservation index (PI) and time-weighted preservation index (TWPI) show how temperature and humidity combine to influence the rate of decay processes such as paper discoloration, dye fading, deterioration of plastics, and textile embrittlement. PI and TWPI values alternate on the PEM display with temperature and RH on a 15-second cycle. Thus, it is possible to determine on sight the overall quality of storage conditions with respect to the “natural aging” rate of all types of organic objects in collections. The display can be turned off, if desired, without interrupting data collection.
The PEM can recall 90 days’ worth of past conditions to its LCD display at the push of a button.
Stored data can be uploaded from the PEM to a computer via a memory card that is inserted into a slot on the side of the PEM. All data in the PEM can be copied to the memory card in less than 20 seconds. Each card can hold data from as many as 16 PEMs. The card can be read by most Windows® laptop computers or by a desktop computer that is equipped with a card-reader accessory.
Users can have printed reports from the Climate Notebook software within minutes of collecting the data from the storage spaces. Compared to hygrothermographs or conventional dataloggers, the fast memory card upload of the PEM and the data-organizing features of Climate Notebook combine to save a significant amount of time for preservation managers.
RECALIBRATION
When the PEM displays BATT LOW, the unit can be returned to IPI for humidity sensor recalibration or replacement, clock reset, and battery replacement. See calibration request form for packing and shipping instructions.
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