42
SYMPTOM
PROBABLE CAUSE
REMEDY
LEAKING
Heat Damaged Part
If the unit is operating with compression
nuts manufactured with CPVC (gray
plastic) and has been exposed to elevated
temperatures, the material may be
damaged. Excessive heat can distort the
plastic material, resulting in a loss in
compression of the O-ring seal. Change
nuts to stainless steel.
Obtaining Proper Water Samples:
Our experience has shown that the vast majority of unsatisfactory post-UV
bacteriological samples are directly related to improper sample-taking techniques.
There are a variety of commercial sample collection apparatuses available.
Should you choose one, be sure to follow the manufacturer’s recommended
procedures.
Optional sample unit fittings on both the intake and discharge UV chamber flange
risers can be provided. We recommend you use these fittings to collect “before
and after UV” water samples to eliminate the possibility of contamination by
nearby piping, fittings, etc.
We recommend you select a valve with a discharge orifice no larger than ¼”
(6mm).
Sampling Procedures:
1) Prior to taking the water sample, have on hand an adequate supply of
sterile bottles. These should be obtained from a source laboratory
and should have been autoclaved and contained within a plastic outer
wrapping.
2) The inside diameter of a sample valve must not exceed ¼” (6mm) to
ensure proper velocity. Prior to taking the sample, it is imperative that
the test sample valve be fully opened under full pressure for a full
three and a half minutes. Temporary tubing or some other material
may be used to direct the water to a container or drain to avoid
unnecessary spillage.
3) After the valve has been left fully open for three and a half minutes,
reduce the flow to a reasonable stream of water (not less than 50% of
full flow). Continue flowing to drain 3 additional minutes.
4) Remove any temporary tubing used for flow diversion.
5) Open the sterile bottle. Holding the cap in a down position, the
operator should then hold his breath while taking the sample so as to
avoid atmospheric contamination of the sample. The operator must
also not allow any fingers to touch the inside of the cap or neck of the
bottle.
6) After the water sample has been taken, the cap should be
immediately secured on the sample container.
7) The sample container should be labeled and placed in a plastic
wrapping and must be taken to the laboratory for plating as soon as
possible. Processing should begin within 3 hours of sample collection
and should comply with accepted standard methods.
Summary of Contents for optima hx series
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