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6.0 Maintenance
6.1 Replacing the gas filter element
The Model 460H is equipped with a gas filter on the ozone inlet. These filters accept
25mm diameter glass fiber elements. Only filter elements of borosilicate glass or quartz
fibers should be used. When the instrument is first installed, the sample filters should be
checked at least once a week for particulate loading and replaced if necessary. Once the
replacement frequency is determined, a regular schedule for filter replacement should be
instituted.
For replacement 25mm filter elements, please contact API’s sales department and request
part number 02851.
Filter Replacement Procedure:
1. First ensure that the gas delivery line is not under pressure and has been purged of
ozone.
2. Remove the four screws securing the gas filter assembly.
3. Remove the bottom half of the filter housing
4. Examine the internal sealing o-ring and replace if necessary.
5. Pull out the stainless steel screen securing the filter element.
6. The element can now be removed and replaced. When re-assembling filter, make
sure that the top stainless steel screen is pushed into the filter cavity, securing the
element in place.
7. After re-assembly, the gas line should be pressurized with oxygen or dry air and
checked for leaks using a bubble solution.
6.2 Cleaning Exterior Surfaces of the M460H
If necessary, the exterior surfaces of M454H can be cleaned with a damp cloth. Do not
attempt to clean any of the other surfaces of the instrument. Do not submerge any part of
the instrument in water or cleaning solution.
6.3 Degree of Protection
The Model 460NEMA has a water ingress rating of IPX65 which indicates that it can
withstand strong jets of water and is totally protected against dust.
P/N 03662D Teledyne API Model 460H O
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Monitor Operator Manual - Page 33