Preventative Maintenance

TO:Equipment User

SUBJECT:Preventative Maintenance for the microwave powered UV system.

A general PM schedule for your UV system is detailed below:

Power supply:

There are no regular maintenance procedures that apply to the power supply except to verify

proper operation of the front cooling fan(s) and to replace filters, if so equipped. Mechanical placement of power supplies should always allow for the unrestricted air movement at front and

rear of the power supply chassis. Since dirt and/or dust deposits can settle on internal electrical components during use, it is advised that this material be removed with a source of dry

compressed air during normal scheduled down time.

Irradiator:

(Regular maintenance) * Every 30 days of operation or as needed

* NOTE: Dirty operating environments may require more frequent service.

1)Remove irradiator from it’s light-shield, and carefully place on workbench with the lamp

cavity facing up.

2)Remove the RF screen assembly, which covers the lamp cavity, and inspect fine tungsten

mesh for any signs of damage. Damage includes tears or punctures in screen mesh, especially

where the screen material is attached to screen frame, arcing on the braided gasket material under screen frame, loose or missing parts. Replace screen assembly if there are any signs of damage.

3)Remove UV bulb, and clean with “Windex” glass cleaner and a lint- free cloth. Alcohol ( IPA ) can also be used to clean the UV bulbs and reflector.

During normal use, foreign material that has passed through the irradiator air supply filters will

deposit on the outer surface of the UV bulb and reflector.

IMPORTANT: These external deposits are difficult to remove, and can eventually

contribute to a reduction of UV energy at the irradiator focal point.

4)Inspect the elliptical reflector for signs of RF damage. This may be seen as a pitting of the

reflective surfaces, dark discoloration on front face, top edges, or at end reflectors. Replace entire reflector assembly if any damage is observed. Note condition of polished surfaces, as a dull or

hazy reflector finish can severely effect the performance of this equipment. Due to the heat in

and around this lamp cavity, most chemicals that come in contact with reflectors/bulbs will be

difficult to completely remove once the irradiator has been in operation for some time.

Clean reflectors with “Windex” glass cleaner or alcohol (IPA) and a lint-free cloth.

Retighten all reflector screws. Normal irradiator operation may cause these screws to loosen, contributing to RF arcing or pitting on the rear surface of the aluminum reflector and wave-guides.

At time of reflector removal or replacement, do inspect the ignitor bulb for signs of damage, including loose quartz envelope, broken wire antennae, or improper installation. If damage exists, replace ignitor bulb, and mounting clip if necessary.

Clean ignitor bulb with alcohol and a lint-free cloth.

5)Reinstall UV bulb into lamp cavity, being careful not to touch quartz surface.

If quartz bulb surface is touched, clean with “Windex” glass cleaner and a lint free cloth. Use a glass cleaner that is free of waxes, silicone, and polishes.

NOTE: The use of alcohol as a cleaning agent may not completely remove grease and oils from the outer surface of the bulbs and reflectors.

Operation of UV bulb with external deposits may cause premature failure of the quartz.

6)Reinstall the RF screen over irradiator lamp cavity, and fasten with screws provided.

Hand-tighten all screws. Do not over-tighten these screws as damage to the screw heads will result, making later removal of RF screen very difficult.

NOTE: Do not operate this equipment with missing or damaged hardware.

7)Reinstall UV irradiator into light-shield, being careful not to damage the RF screen mesh.

8)Reconnect the high voltage cables at the irradiator. Verify a complete connection. IMPORTANT: Verify that all cable connectors are in good condition, and there are no damaged/missing parts. Damage to HV connectors or the wire insulation will require complete cable replacement. Never attempt to repair HV cables.

9)Change air supply filters on a regular schedule to prevent the buildup of foreign material on bulb, reflector, and magnetron assemblies. Airborne impurities can degrade the optical performance of both the UV bulb and the polished reflector surfaces.

10)Verify irradiator inlet cooling air to be within the proper specification. Operation of irradiator below the minimum air cooling specification can result in premature failure of major components. Severe damage to magnetrons and quartz bulb will result.

Consult Fusion OPERATION / MAINTENANCE manual for specific instructions on how to correctly measure irradiator air pressure values.

11)Verify that RF detector is in good condition, and there are no damaged parts.

Test the operation of RF detector. Place system in “STANDBY” or “LAMP-ON”, then

push the black button on the side of RF-1 detector for approx. 4 seconds. At this time the power supply should fault out with an indication of; RF INTLK