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The Sentry controller, the heart of the Sentry system, manages the sensor modules and alarm relays and interfaces with the operator via a user-friendly front panel. The front panel includes a display indicating concentration and sensor number, an alphanumeric display for diagnostics and menu, keypad and status indicators. Adaptability to specific application needs is key to the Sentry design. From the controller the user can configure alarm logic schemes for zone or individual alarms, set easily identifiable gas and module tags, perform non-intrusive one-person calibration, access printer reports and utilize Modbus or other protocols for interface to plant-wide distributed control systems.

Key features of the controller include:

• Menu prompting guides the user through system configuration and operation.
  
• System security with user identification codes to prevent unauthorized users from changing the configuration and identifies those users who made changes.
  
• Internal self-diagnostics routine makes over 120 checks of operating parameters to ensure proper system performance.
  
• User configured alphanumeric gas tags and module tags to easily identify sensor modules location and gas type.
  
• Modbus or other commonly used protocols available for interface to other systems.
  
• Sensor scan displays choices to meet your specific needs. Reduced installation costs through multiplexing of digital signals from the sensors to the controller via a common twisted pair cable.
  
• Simple record keeping via an optional 40-column printer.
  
• Relay logic for customized response - standard common relays, individual relays, custom relays.
  
• Optional battery backup.
  
• Optional output expansion module for individual channel relays and analog output.
  
• Optional software enhancement package for enhance alarm acknowledgment features and fixed gas and module tags.