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Hardest Working Data Loggers in the Industry - ACR
Contact Monitoring

Wiring diagram for contact monitoring

Switch contact status is effortless when using a portable self-contained Data Logger from ACR - simply wire two terminals without an external power supply.

ACR Temperature Data Loggers can be used to monitor dry-contacts either normally open or closed. These can be part of existing circuits as long as voltage is not applied to the inputs hence the term dry - this can be a separate pole on a switch or relay. For applications where only a voltage signal is available, use an interposing relay to isolate the input. TrendReader software produces a graph showing the duty cycle of the contact either on or off over the sampling interval. In normal mode, a contact state change can be detected once every 8 seconds. In the SmartReader Plus Fast Read mode, a state change can be detected once every 25msec. For momentary contact closure such as a pushbutton switch or rate counter, it is recommeded to use a Pulse Input Data Logger to capture every event.   

Features

  • Easy Installation - Any Contact Type
  • No External Power Required 
  • Software Shows Duty Cycle 

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