Myron L 512M10 User Manual

SINGLE RANGE DS METERS

Model 512M5 shown

Range “S” Button
(Internal Standard)

Cell Cup

Black Button
(µmhos or ppm)

Upper Electrode

Meter Zero

Adjust

Pointer

OPERATING INSTRUCTIONS

Us er ’s Manual for Models 512T2
512T3
512T4
512T5
512T10
512M2
512M3
512M4
512M5
512M10

DESCRIPTION

This manual describes your Myron L DS meter, tells you
how to use it, and how to keep it working accurately for
many years.

Your model 512 single range DS Meter is a compact
instrument which operates on the principal of electrical
conductivity. It will quickly determine the conductivity or
ppm/Total Dissolved Solids of almost any solution. Models
512M2, 512M3, 512M4, 512M5 and 512M10 have dials
calibrated in micromhos (µmhos), which is equivalent to
the metric microsiemens (µS). Models 512T2, 512T3,
512T4, 512T5 and 512T10 convert the conductivity
directly into parts per million (ppm) of Total Dissolved
Solids.

All are 3.4” x 4.5” x 4.0” (85 x 129 x 126mm) and weigh
less than one pound (0.45kg). DS Meters are completely
self-contained. The built-in cell is automatically
temperature compensated from 50º to 160ºF (10º to
71ºC). They are powered by a 9 volt battery good for at
least 2000 tests, or one year shelf life.

512T 512M

MODEL RANGE MODEL RANGE

512T2 0-50 ppm 512M2 0-50 µmhos

512T3 0-500 ppm 512M3 0-5000 µmho

512T4 0-2500 ppm 512M4 0-2500 µmho

512T5 0-5000 ppm 512M5 0-5000 µmho

512T10 0-10,000 ppm 512M10 0-10,000 µmho

The pictures in this manual show the major operating
parts of your Myron L DS Meter. Handle your DS Meter
and identify these parts to become familiar with it.

By using an RE-10 Range Extender (see
ACCESSORIES), the maximum range of most meters may
be increased ten times.

USING YOUR METER CALIBRATION

Battery Strap

Calibration Control

Lower Electrode
(inside cell)

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 nished 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 ll 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 x 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, rst 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 ngernails or a small
screwdriver to loosen the front or rear edge. Identify the
Calibration Control (see photo below left) so you can

nd 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 eld 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 eld
calibration check, or for using the range doubling
technique. It is not a replacement for calibration with
Standard Solution.