The Context Plus XP95 Switch Monitor with isolator is designed to monitor the state of one or more single pole, volt-free contacts connected on a single pair of cables and to report the status to Context Plus compatible control equipment.

 
 

Standard Features

  • The Switch Monitor provides four input states to the control equipment: ‘Normal’, ‘Fault’, ‘Pre-alarm’ and ‘Alarm’. The Switch Monitor has a red LED to indicate an alarm and two yellow LEDs to indicate a switch input wiring fault or a loop short-circuit wiring fault.
  • The Switch Monitor is fitted with a bi-directional short-circuit isolator and will be unaffected by a single short-circuit on either loop input or output.

ELECTRICAL CONSIDERATIONS
The Switch Monitor is loop powered and operates at 17-28V DC with protocol voltage pulses of 5-9V. It is designed to accept a maximum line resistance of 50Ω. The end-of-line resistor required is 20kΩ.
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