Myron L M6/PH - Manual (Page 3)

USING YOUR METER
CONDUCTIVITY MEASUREMENT: Model EP11/pH
1. Turn the Range Switch to the desired range. If you don't know
which range to use, set it to 1000.
2. Rinse the cell cup three times with the sample you want to test.
(For very hot or very cold samples see TEMPERATURE
COMPENSATION below.)
NEVER FILL THE CELL BY DIPPING THE METER INTO WATER!
3. Fill the cell with another sample to at least
1 /
4
" (6 mm) above the
upper electrode.
4. Press the black button.
5. Read the dial's black scale value indicated by the pointer. If the
pointer is very low on the left or goes off the scale to the right, try
the next lower or higher range.
6. Multiply the dial's black scale value by the range setting to
determine conductivity in micromhos (microsiemens).
7. If the pointer goes off the scale to the right on the x1000 range,
use an RE-10 range extender (see ACCESSORIES).
CONDUCTIVITY MEASUREMENT: Model M6/pH
1. Rinse and fill the cell cup as in steps 2 and 3 above.
2. Press the black button.
3. Read the conductivity value in micromhos (microsiemens)
indicated by the pointer on the dial's black scale.
4. If the pointer goes off the scale to the right, use an RE-10 range
extender (see ACCESSORIES).
NOTE: When you are finished with the meter, RINSE THE CELL
CUP with clean water, preferably distilled or deionized.
pH MEASUREMENT
1. Obtain sample to be tested; if necessary, heat or cool it to room
temperature.
2. Remove the pH compartment cap and sharply shake out any
liquid.
3. Pour or squirt the sample into the built-in cell cup, especially the
small pH compartment. Shake out and repeat three times with
the sample to be tested. These may be the same rinsings used
to condition the cell for conductivity measurement.
4. Press the red button. The pointer immediately indicates the pH
of the sample on the red scale. If the pointer drifts, wait
approximately 30 seconds and press the button again to obtain
a stable reading of pH. If drifting continues, the electrode may be
coated with a film. Use a liquid cleaner such as Windex
™ or
Fantastic ™ to clean the pH sensor bulb (see pH SENSOR).
5. Rinse both pH and conductivity parts of the cell with clean water.
LEAVE SOME LIQUID IN THE pH COMPARTMENT AND
RECAP.
TEMPERATURE COMPENSATION: For very hot or very cold
solutions let the three rinse samples each remain in the cell for several
seconds, then immediately fill the cell with the sample you want to
test (step 3 above). This allows the automatic temperature
compensation feature time to work properly.
CAUTION:
ALWAYS store your pH sensor wet and with the cap on.
ALWAYS rinse the cell cup with pure water immediately after use or
cleaning. This will prevent the build-up of unwanted deposits and
possible contamination of the sample.
DO NOT test solutions which could damage the pH sensor. See
MAINTENANCE.
DO NOT use with samples hotter than 160
°
F (71
°
C). The readings
WILL NOT be accurate.
DO NOT splash solvents such as lacquer thinner, acetone benzene
or chlorinated solvents on the plastic case.
DO NOT fix or modify the meter. That will void your warranty. See
SERVICE for details or consult Myron L Company.
DO NOT DIP THE INSTRUMENT INTO WATER. If water does get
inside the instrument, see MAINTENANCE for instructions on drying
it.
CONDUCTIVITY CALIBRATION
CONDUCTIVITY STANDARD SOLUTIONS: A Standard Solution
has a known conductivity and ppm. Your meter was calibrated at the
factory using NIST Standard Solutions. You can keep your meter
accurate by using the same NIST Standard Solutions. To pick the
right Myron L Company Standard Solution for your meter see
ACCESSORIES.
How often you calibrate your meter depends on how much you
use it. For once a day use, recalibrate it every three months.
CHECKING CONDUCTIVITY CALIBRATION
1. Turn the Range Switch to the x1000 range (EP11/pH only).
2. Test a sample of appropriate Standard Solution.
CAUTION: Throw away the Standard Solution as you use it. Don't
put the used samples back in the bottle.
3. If the pDS Meter does not indicate the same value as is on the
Standard Solution bottle's label, first clean the cell. For directions
on how to do this see CELL CUP inside. Rinse the cell thoroughly
and test the Standard Solution again. If the pDS Meter still does
not indicate the correct value, recalibrate it as described below.
TO RECALIBRATE CONDUCTIVITY
1. Remove the bottom cover using fingernails or a small screwdriver
to loosen the front or rear edge. Identify the Conductivity
Calibration Control (see photo below) so you can find it by touch
while calibrating.
2. Test another sample of the Standard Solution (be careful to not
splash solution inside the meter).
3. Adjust the Conductivity Calibration Control until the meter
indicates the value that is on the Standard Solution label.