Emerson MAN -0016-00, UVC120 manual Unit V MAINTENANCE, Routine Maintenance, Troubleshooting

Unit V MAINTENANCE

ROUTINE MAINTENANCE

The detector requires no periodic calibration. To maintain maximum sensitivity, the viewing windows should be cleaned on a routine basis depending on the type and amount of contaminants in the area.

The rubber O-rings on the detector housing are used to ensure it is watertight. The housings should be opened periodically and the O-rings inspected for breaks, cracks or dryness. To test them, remove the O-rings from the detector housing and stretch them slightly. If cracks are visible, the O-ring should be replaced. If they feel dry to the touch, a thin coating of lubricant should be applied. W hen re-installing the O-rings, be sure that they are properly seated in the groove on the housing.

These O-rings must be properly installed and in good condition to prevent water from entering the detector and causing failure. The life expectancy of rubber O-rings varies, depending on the type and amount of contaminants present in the area. The person who maintains the system must rely on experience and common sense to determine how frequently the rings should be inspected. A coating of lubricant should also be applied to the enclosure threads before reassembling the detector to help prevent moisture from entering.

CAUTION

The O-ring should be lubricated with polyalphaolefin grease, such as GRS-450 made by CPI Engineering. Silicone based lubricants should never be used if catalytic type combustible gas sensors are being used in conjunction with the UV detectors, since silicone lubricant on or near the combustible gas sensor will cause permanent damage to the sensing element.

TROUBLESHOOTING

The Automatic vi (visual integrity) feature continuously checks the detectors for correct response. If a problem is detected, the fault LED will turn on, the left side of the digital display will indicate which channel has the problem and the right side of the digital display will show “OIL” or “OIH” The fault relay will become de-energized.

If a fault is in the detector or wiring, the left side of the display will indicate which detector is affected. The right side of the display will indicate by code number the type of fault. If the fault is in the microprocessor circuitry, the fault LED will turn on, but the left side of the digital display will remain blank. Refer to Table 3 for a detailed explanation of the status/fault codes.

DEVICE REPAIR AND RETURN

The detector and controller are not designed to be repaired by the customer in the field. If a problem should develop, first carefully check for proper wiring and programming. If it is determined that the problem is caused by an electrical malfunction, the unit must be returned to the factory for repair.

Net Safety Monitoring Inc encourages its distributors to make advance replacement units available to the user during the warranty period. This allows Net Safety Monitoring Inc. to take time to repair the unit completely while users keep their operations running with the advance replacement unit.

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