The S7841 is a 4-channel digital event recorder which can record the date and time when any of it's 4 inputs changes state. The inputs can be volt-free contacts, such as door contacts, machine switches, or it can be a voltage signal. Data can then be downloaded to a PC for storage and analysis. A LCD display shows the current sate of the logger.
The S7841 is a stand-alone device, and the replaceble internal battery typically lasts 4 years. Up to 16254 events can be recordered per input, and spikes of less than 1/2 second are ignored to prevent false results.
Data download is via a Rs232, USB or Ethernet connection.
More Information from http://www.audon.co.uk/s7841.html
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