The Oxigraf remote indicator light is specially chosen for use in your control room environment. It has four colors:

• Red (Limit A exceeded, potentially hazardous low-level of oxygen)
• Amber (Indicates a warning condition requiring techician attention)
• Blue (Limit B exceeded, calibration recommended)
• Green (Indicates System OK, no malfunctions)

It is labeled to describe the meaning of each light. The lights are long-life LED's for reliability. In addition to the lights, the unit has an alarm that sounds when the Limit A light (Red) is activated.