Myron L 512M10 - Manual (Page 2)

1. 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!
2. Fill the cell with another sample to at least 1/4” (6mm)
above the upper electrode.
3. press the black button.
4. read the dial value indicated by the pointer to determine
parts per million (ppm) total Dissolved solids on the
512t models or the conductivity in micromhos (µmhos)
on the 512M models.
5. if the pointer goes off the scale to the right, try range
DouBLing (see FieLD caLiBration) or 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.
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 2 above). this allows the automatic temperature
compensation feature time to work properly.
caution
do not use with samples hotter than 160ºF (71ºc).
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.
standard solutions: a standard solution has a
known conductivity and ppm. Your meter was calibrated at
the factory using a standard solution. You can keep your
meter accurate by using the same standard solution. to
pick the right standard solution for your meter see
accessories.
checking calibration
1. test a sample of appropriate standard solution.
caution: throw the standard solution away as you use
it. Don’t put the used samples back in the bottle.
2. if the Ds 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 inside.
rinse the cell thoroughly and test the standard solution
again. if the Ds Meter still does not indicate the correct
value, recalibrate it as described below.
to recalibrate the meter
1. Remove the bottom cover using fingernails or a small
screwdriver to loosen the front or rear edge. identify the
calibration control (see photo below left) so you can
find it by touch while calibrating.
2. test another sample of the standard solution (be
careful to not to get any solution inside the meter).
3. adjust the calibration control until the meter indicates
the value that is on the standard solution label.
4. press the red “s” button. compare the meter reading to
the internaL stanDarD value on the meter’s bottom
label. if they are noticeably different, mark the new value
in place of the old one.
note:
a 512t (ppm) Meter may be calibrated to read either
442™ or nacl parts per million, but not micromhos. a
512M (conductivity) Meter may only be set to read
micromhos.
internal standard: an internaL stanDarD value
for each meter is on the label on the bottom cover of each
meter. use it between normal calibrations as a field check
of your meter’s accuracy. to verify your meter’s calibration:
1. press the red “s” button.
2. if the reading matches the internaL stanDarD value
on the bottom label, your meter is in calibration. if not,
see FieLD caLiBration.
note:
The feature described above is intended as a quick field
calibration check, or for using the range doubling
technique. it is not a replacement for calibration with
standard solution.
using your meter calibration
Battery Strap
Calibration Control
Lower Electrode
(inside cell)