The SL120 and SL121 are low cost Temperature data loggers with the SL121's offering optional audible and visible alarms. The SL120T series is now split into two versions; internal temperature and external temperature. All data loggers are self contained, with internal batteries that last up to 5 years. The data loggers are configured using Signatrols' TempIT software via an infra red reader that takes its power from the COM port on the computer. The data logger can be programmed with a user manifest that can be used to describe the application that the data logger is being used for, vehicle and driver details if used for a transportation application or room details if used in a building management application. Once configured, the data loggers are placed in the area or package to be monitored. At the end of the logging period, the data logger is taken back to the computer and the data downloaded. TempIT will then display the readings as a graph against time in the TempIT-Lite package or with an additional data table in the full TempIT package. If the SL121T is used, a green LED is activated when the data logger is logging, changing to red if the pre-programmed alarm levels are exceed giving instant indication that the logger has been subjected to physical conditions outside those set by the operator. There is also an audible alarm function to identify alarms conditions.

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