OPERATING PROCEDURE
The 9 volt
battery should already be installed
1. Extend electrode pair to either the 90° or 180° measurement
position.
2. Remove the electrode covers as described in “Setting
Up the Electrodes” section.
3. Turn on the instrument by pressing the ON/OFF switch
once.
“–1” and the unit of measure will momentarily appear and
then a second number with the unit of measure is displayed. The
display should show which parameter is being measured (for example,
pH, µS (micro-siemens), or µS x 10. Only the 200K range utilizes
the x10 annunciator on the TDS-4. 20K and 2K are direct readings.
Overrange conductivity is indicated by "1" on the
display.
4. Calibrate the meter before using the instrument. Refer
to the previous section.
5. Immerse electrodes in solution to be measured. For proper
operation, immerse electrodes to half their length.
6. Agitate electrodes briefly (to mix the sample) and observe
the reading.
7. To change parameters, press the pH/µS switch one time.
The range sequence on the TDS-4 is pH-200K-20K-2K.
8. Rinse the electrodes thoroughly and replace pH soaker
bottle and conductivity cover before folding into storage compartment
(at the back); fill the bottle with a small amount of pH4 buffer
or pH7 buffer.
9. Remove the battery when the instrument is to be stored
for a long period of time.
pH ELECTRODE CARE
pH Electrodes must be kept moist. The pH electrode was shipped
stored in a soaker storage bottle. The storage solution contained
in the bottle is a potassium chloride solution. Do not be alarmed
if white crystals form at the end of the electrode. It is
simply potassium chloride. Rinse with distilled water to dissolve
the crystals before using the electrode.
For storage, place the electrode back in the soaker bottle.
If the potassium chloride solution evaporates or is lost, simply
use pH buffer 4.0 or pH buffer 7.0 supplied for storage. DO NOT
use distilled or deionized water as this will drastically reduce
the electrode lifespan.
If the pH electrode should dry out, soak the electrode up to 2
hours in pH buffer 4.0 solution. If the electrode is left dry
from an extended period of time, permanent damage will result.
pH
ELECTRODE REPLACEMENT
pH Electrode Replacement The pH electrode can be replaced
with the replacement electrode available from NEWPORT
Engineering (part number PHE-8200). To remove the electrode,
simply unscrew it clockwise from the electrode pivot hinge
on the meter. You will hear a pop; that’s OK. Refer to
Figure 4.
To install a new electrode,
attach the connector ends and screw counter-clockwise
or to the right until you have a good connection.
Figure
4 (on right)
How to Unscrew the pH Electrode
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CONDUCTIVITY
ELECTRODE CARE
The conductivity electrode needs to be kept clean and free of
deposits and other types of build-up. Use the detergent powder
supplied in the plastic bag for cleaning the electrode.
1. Mix a convenient amount of cleaning solution using the
detergent powder. Use a mixing ratio that is 30 grams of powder
to 4 liters of water (the bag contains 30 grams).
2. Dip the brush into the cleaning solution.
3. Insert the brush into the conductivity electrode approximately
1 1/2" taking care to clean both conductance rings. One ring
is located at the bottom of the electrode and the other is located
approximately 1" up from the bottom, above the blue collar.
4. Twist the brush and scrub up and down for 20 to 30 seconds.
5. Rinse the electrode thoroughly in distilled or deionized
water.
6. Clean the brush with tap water and rinse it with distilled
or deionized water after using.
CONDUCTIVITY ELECTRODE
REPLACEMENT
THE CONDUCTIVITY ELECTRODE CANNOT BE UNSCREWED (THIS IS THE ELECTRODE
WITH A SMALL HOLE IN THE BLUE CONNECTOR HOUSING). The conductivity
electrode is field replaceable by qualified technicians only.
The part number of the conductivity electrode is CDE-8200. Contact
NEWPORT’s Engineering Department for instructions on how
to replace the electrode.
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