Myron L EP-10 User Manual

Battery

Indicator

Range Switch

Cell Cup

Button

Upper Electrode

Meter Zero

Adjust

Pointer

Model EP10 shown

4&5 RANGE CONDUCTIVITY METERS

OPERATING INSTRUCTIONS

User’s Manual for Models EP

EP-10

DESCRIPTION

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

Myron L EP & EP10 Meters are compact, multi-range
instruments which operate on the principle of electrical
conductivity. They each contain a built-in cell cup and will
quickly determine the conductivity of almost any solution.
Both have dials calibrated in micromhos (µmhos)
equivalent to the metric microsiemens (µS). Model EP
features a second dial scale calibrated in
megohms/resistivity for testing ultrapure water.

weigh less than one pound (0.45 kg). EP series meters are
completely self-contained. The built-in cell is automatically
temperature compensated. They are powered by one 9
volt battery good for at least 2000 tests, or one year shelf
life.

MODEL RANGES

EP 0-0.5, 0-5, 0-50, 0-500, 0-5,000 micromhos (µmhos)

2-30 Megohms

EP10 0-10, 0-100, 0-1,000, 0-10,000 micromhos (µmhos)

ACCURACY: (Both Models) ±2% of full scale
REPEATABILITY: (Both Models) ±1%

TEMPERATURE COMPENSATION TO 25ºC:

EP 32-120ºF (0-49ºC)
EP10 50-160ºF (10-71ºC)

Both are 3.4” x 4.5” x 4.0” (86 x 114 x 102mm) and

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 EP series meter. Handle your meter
and identify these parts to become familiar with it.

MODEL EP

MODEL EP

MODEL EP10

USING YOUR METER

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’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).

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.

RESISTIVITY MEASUREMENT: Model EP only. Accurate
measurement of high purity water is difcult even under
controlled conditions. Water temperature and even carbon
dioxide (CO

) in the atmosphere will greatly inuence

2

resistivity. Use the following

methods for best accuracy:

1. Turn the range switch to the x.1 range (with the “Ω”
symbol around it).

2. Hold your meter close to the high purity water outlet.
While pressing the button, allow the water to ow into
the Cell Cup and out again, continuously purging the
cell. Do not allow air bubbles to collect.

3. As the cell is washed clean of trace contamination, the
reading will drop and eventually stabilize. Read the
resistivity directly in megohms on the red scale. DO

NOT multiply the dial reading by the range switch value.

NOTE:

The closer the tested water temperature is to 25ºC
(77ºF), and the less it is exposed to air, the more accurate
your reading will be.

CAUTION
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 next
sample.

DO NOT use with samples hotter than specied. 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.