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anode portion of the Spindle. A possible
indication of lead oxide build-up is lower
than normal readings due to less
surface area on the lead anode. The
lead strip will appear dull and possibly
have yellow deposits near the edges.
To clean the lead anode, simply take a
toothbrush or plastic scouring pad (i.e.
Scotch-Brite) and gently scrub the lead
anode with distilled water until it shines.
You should also check the platinum
cathode tip and the four flow-through
holes for dirt or debris. If any exists, use
a fine wire to clean the holes.
NOTE: Do NOT scrub the platinum
cathode. However, you can polish the
platinum tip using a polishing cloth.
Lastly, make sure the o-rings used in
the Outer Body, Filler Valve, and Flow
Chamber are intact and in good
condition.
When placing the dissolved oxygen
sensor into the stainless steel Flow
Chamber, follow the steps outlined
below:
1. Gently remove the red vinyl wetting
cap from the end of the dissolved
oxygen sensor.
2. Carefully insert the dissolved oxygen
sensor into the flow chamber until it
rests flush with the top of the
chamber. Any twisting of the probe
should always be clockwise. Place
the locking nut over the dissolved
oxygen sensor cable and secure it
firmly onto the flow chamber.
3. To hook up sample flow to the Flow
Chamber, place the inlet flow on the
left fitting (with the mounting bracket
facing away from you) and the outlet
flow on the right fitting. If the Flow
Chamber is to be permanently
mounted on-line, stainless steel
fittings with ¼ inch stainless steel
tubing is recommended. If the
installation is a portable application,
nylon or heavy-wall Tygon tubing
may be used.
3.11 Troubleshooting
The Martek Mark 25 represents over
thirty years of experience in water
quality measurements and, as such, has
been designed to provide simple,
reliable operation for many years.
To obtain optimum performance from
the Mark 25, care should be taken to
ensure the sensor has adequate flow
and is free of obstructions. In addition, it
is important to maintain correct
calibration on a regular basis.
Comparison of the Mark 25 to a referee
system is the preferred method of
validation, however, calibration using
the Mark 25's internal circuitry is also
acceptable.
In the event a problem develops with
the Mark 25 that cannot be resolved
through calibration or maintenance,
contact Martek Instruments directly via
telephone, fax, or e-mail located at our
website, ww.martekinstruments.com.
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