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4.0 Maintenance
4.1 Replacing the sample filter element
If your Model 450 has been equipped with an internal or external sample filter, the
Teflon filter elements must be replaced on a regular basis to ensure accurate readings
from the M450. The frequency of this operation will be determined by the particulate
loading from the air being sampled and will vary greatly from location to location. When
the instrument is first installed, the sample filters should be checked at least once a week
for dirt loading and replaced if necessary. Once the replacement frequency is
determined, a regular schedule for filter replacement should be instituted.
For replacement 47mm Teflon filter elements, please contact Teledyne API’s sales
department and request part number 00969.
Filter Replacement Procedure:
1. If the M450 has been equipped with an internal filter, access the filter by releasing the
two quick-release tabs near the top of the front panel. The front panel will now swing
down and the filter element can be viewed through the glass cover on the filter
assembly, which is located on the left hand side of the panel.
2. To replace the element, unscrew the black knurled ring over the glass cover and
carefully remove the glass cover and the white Teflon retaining ring over the element.
The element can now be removed and replaced.
1. Replace the Teflon retaining ring and glass cover. Note: When re-installing the
Teflon retaining ring, make sure the notches in the ring are visible and facing up
towards the glass cover.
NOTE
Take care when handling the filter element and the sample filter parts that
they are not contaminated with oil from your fingers or other sources. Even
a small amount of oil on the wetted surfaces can cause the instrument to
respond very slowly to ozone. Clean gloves or tweezers should be used to
handle the clean filter elements.
2. Screw the black ring onto the glass cover. The ring should be screwed to a snug
position by hand, no tool should ever be used for installing the knurled ring.
P/N 02395D1 Teledyne API Model 450 O
3
Monitor Instruction Manual - Page 45