The GDS Corp. C2 Quad Four Channel Display / Alarm Controller is designed to provide simultaneous display and alarm functions for four gas detection variables. A graphic LCD displays monitored data as bar graphs and engineering units. Three adjustable alarm levels are provided per channel. Relay outputs allow control of beacons, horns and other alarm events.

The C2 Quad Protector controller supports industry standard 4-20mA inputs as well as direct connection to catalytic bead or SmartIR infrared sensors for combustible gases or photoionization (PID) sensors for Benzene or other volatile organic compounds (VOCs). Sensors may be remote mounted. When using the direct bridge input option, up to two of the four channels can be configured for direct 4-20mA analog input.

The C2 Quad is easy to configure and user friendly. Measurement ranges in engineering units, adjustable alarm set-points, optional serial interfaces, and many other features offer flexibility to meet most demanding applications.

An optional RS-485 Modbus slave port allows up to 128 C2’s to be multidropped onto a single data highway for interrogation by a remote MODBUS master device. A MODBUS TCP interface is also available for ethernet network applications.

Available C2 Quad options include 5 amp SPDT discrete alarm relays per channel, 4-20mA outputs, light stacks and audible annunciators

Brochure Manual


  • Analog input or direct bridge-type sensor input for combustibles
  • High resolution LCD with graphic display and channel-specific indicator LEDs for quick problem identification
  • Alarm LEDs flash when new and become steady when acknowledged
  • Channel-specific display with short term trend data
  • Three independent alarm levels per channel that include setpoint, on/off delay, alarm above / below and voting options
  • Built-in calibration mode offers pushbutton zero / span calibration for direct sensor interface applications
  • Standard outputs include two programmable common relays plus MODBUS slave interface
  • Optional discrete channel-specific relays and 4-20mA outputs
  • Magnetic keypad available for nonintrusive operation in potentially hazardous locations
  • CSA approved for Class I Div 2 areas without purge. CE mark
  • NEMA 4X and NEMA 7 Explosion-Proof packaging options available
  • Authorization Mode allows locking of critical configuration variables