Myron L 532M1 User Manual

Model 532T1 shown

Range Switch
(set on Internal Standard)

Cell Cup

Button

Upper Electrode

Meter Zero

Adjust

Pointer

THREE RANGE DS METERS™

OPERATING INSTRUCTIONS

User’s Manual for Models

532T1
532T2
532M1

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 532 three range DS Meter is a compact
instrument which operates on the principle of electrical
conductivity. It will quickly determine the conductivity or
ppm/Total Dissolved Solids of almost any solution. Model
532M1 has a dial calibrated in micromhos (µmhos), which
is equivalent to the metric microsiemens (µS). Models
532T1 and 532T2 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 (.45 kg). DS Meters are completely self­contained. 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.

MODEL RANGES

532T1 0-50, 0-500, 0-5000 ppm
532T2 0-25, 0-250, 0-2500 ppm
532M1 0-50, 0-500, 0-5000 µmho

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

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.

USING YOUR METER CALIBRATION

Battery Strap

Master Calibration Control (X1000)

Lower Electrode

(inside cell)

X100
Trimmer

X10
Trimmer

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” (6mm)
above the upper electrode.

4. Press the black button.

5. Read the dial 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 value by the range setting to determine
parts per million (ppm) Total Dissolved Solids on the
532T models or the conductivity in micromhos (µmhos)
on the 532M1.

7. If the pointer goes off the scale to the right on the x1000
range, try RANGE DOUBLING (see inside) 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 3 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 NIST traceable Standard Solutions. You
can keep your meter accurate by using these same
Standard Solutions. To pick the right Standard Solution for
your meter see ACCESSORIES.

CHECKING CALIBRATION

1. Turn the Range Switch to the x1000 range.

2. 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.

3. 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
three Calibration Controls (see photo below left) so you

can nd them by touch while calibrating.

2. Test another sample of the Standard Solution (be
careful to not to splash solution inside the meter).

3. Adjust the Master Calibration Control until the meter
indicates the value that is on the Standard Solution
label.

4. The Master Calibration Control adjusts all ranges. For
best accuracy in the lower ranges, use the
recommended Standard Solutions for the x100 and x10
ranges. Use the x100 and x10 trimmers to recalibrate
those ranges as in steps 2 and 3 above.

5. Turn the Range Switch to “S” and press the 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 532T (ppm) Meter may be calibrated to read either
442 or NaCl parts per million, but not micromhos. A
532M1 (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. Turn the Range Switch to “S” and press the 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.