The QRO consists of a high-voltage, low-current power supply section located in the P300MQ power supply that allows the magnetron in the irradiator to maintain an ignited bulb at a very low input power level (approximately 10%) and a very low UV output level (less than 1%). This feature is intended for use in processes that require occasional periods of decreased UV output, or in the event of a short duration process interruption.

CAUTION: The QRO is not intended for use as a shutter, or in processes that require rapid On-Off cycles. This kind of use may be detrimental to bulb life span.

The actual restart time of the bulb will depend upon the elapsed time from when the lamp was switched from the Lamp On state to the Standby state. Representative data for the restart time from the QRO state to the Lamp On state (70%, 80%, and 90% UV output) is shown versus QRO state duration in Figure 16, Figure 17, and Figure 18.

The QRO state, when enabled, will automatically occur when the power supply is switched from the Lamp On state to the Standby state. The QRO state is indicated by the alternate flashing of the green Lamp On and yellow Standby buttons on the front of the power supply. The QRO state will last for a maximum of 40 seconds, after which it will revert to the Standby state and the yellow button only will remain on.

WARNING: While the lamp’s light output is low during the QRO state, both eye and skin protection should be worn in the event of possible direct or indirect exposure. Refer to Chapter 1, “Safety” for detailed information regarding ultraviolet radiation safety.

Installation, Operation, and Maintenance Manual # 509252 Rev R

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