Unit installation

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6. Replace the probe and the coaxial cable.
7. Turn the power “on” and resume operation.
Whenever new lamps have been installed,
follow all resetting instructions.
measuring performance
Every UV treatment unit should be tested periodically
to verify actual efficiency. Regardless of the intended
application or any optional equipment which may have
been provided with your UV unit, the most accurate and
dependable procedure is to conduct post-UV sample
analysis in accordance with standard testing methods.
Periodic sample collection and testing should be
scheduled as often as the user deems sufficient to be
assured the quality of the Aquafine ultraviolet unit
effluent is acceptable.
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, and should you choose one, be
sure to follow the manufacturer’s recommended
procedures.
We have provided
1
/4” NPT threaded fittings on both the
intake and discharge UV chamber flange risers. 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
1
/4” (6 mm).
sampling procedures
The following procedure is recommended for collecting
samples for bacteriological analysis when sample valves
are installed:
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
1
/4” (6 mm) 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 one 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
one half minutes, reduce the flow to a reasonable
stream of water (not less than 50% of full flow).
Continue flowing to drain three additional minutes.
4. Remove any temporary tubing used for flow diver-
sion.
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 his finger to touch the inside of the cap or
the 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 three hours of sample collection and
should comply with accepted standard methods.
The above procedure was developed by a leading national
pharmaceutical firm after an 18-month study. It has been
found that virtually all removable debris which may
accumulate within a sample valve can be mechanically
flushed during the procedures detailed above.
We recommend duplicate samples be taken at each test
station, during each specific test, to avoid laboratory
error and to ensure reasonable repeatability and validity
through comparison.