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.
FIELD CALIBRATION/MAINTENANCE ACCESSORIES
2. Adjust
Calibration
Control to ½
value shown
on label.
3. Test Sample.
1. Press Red
“S” button.
4. Double Dial
Reading
EASY STEPS TO DOUBLE RANGE
1. Remove the bottom cover using ngernails or a small
screwdriver to loosen the front or rear edge.
2. Press the red “S” button and adjust the Calibration
Control until the meter reading is the same as the
INTERNAL STANDARD value.
3. Replace the bottom cover.
RANGE DOUBLING
1. Remove the bottom cover.
2. While pressing the red “S” button, adjust the
Calibration Control until the meter reads one-half the
INTERNAL STANDARD value shown on the bottom
label. For example:
If the INTERNAL STANDARD value is 4200, adjust the
Calibration Control until the reading is 2100.
3. Test your sample (take care to keep the inside of the
meter dry). Multiply by two the reading of the sample
tested. For example:
If the meter reading is 3200, the actual value of the
sample tested is 6400 (3200 x 2).
NOTE:
After completing tests requiring range doubling, reset
“S” to its proper value and replace bottom cover.
CELL
Self-conditioning of the built-in electrodes occurs each
time the button is pressed with a sample in the cell cup.
This ensures consistent results each time. With some
samples a small downward swing of the pointer is a result
of this conditioning action. This action is powerful and
removes normal lms of oil and dirt. However, if very dirty
samples – particularly scaling types – are allowed to dry
in the cell cup, a lm will build up. This lm reduces
accuracy. When there are visible lms of oil, dirt or scale
in the cell cup or on the electrode, scrub them lightly with
a small brush and household cleanser. Rinse out the
cleanser and the meter is ready for accurate
measurements.
WATER INSIDE THE METER
Your Myron L meter is a rugged instrument and will
withstand water exposure around its cell, meter
movement, and switches. However, care should be taken
to keep water from leaking in around the bottom cover. It is
not sealed (to prevent condensation from forming).
If water is relatively clean (i.e., tap water or better), and
there are only a few drops inside the meter, dry it as
described below. Large amounts of water, corrosive or
very dirty solutions will almost certainly damage the meter
movement or electronics. Such meters should be returned
to the Myron L Company for repair.
To dry your meter:
1. Shake excess water out of the inside of the meter.
2. Dab the exposed surfaces dry with an absorbent cloth
or tissue. Avoid pushing any water into the Calibration
Control or either of the switches.
3. Air dry the meter in a warm area with the bottom cover
off. Allow several hours for thorough drying.
If the water entered through a leak in the case or cell, or
if the instrument shows erratic readings or other unusual
behavior, return it to the Myron L Company for servicing.
MAINTENANCE
BATTERY CHECK
1. Press the red “S” button. Adjust the Calibration Control
to maximum.
2. If the meter reads less than full scale, the battery
should be replaced. Remove the bottom cover. Detach
the battery connector. Pull on the vinyl strap to remove
the battery. Replace with a fresh zinc carbon or alkaline
9 volt battery. Reinsert the vinyl strap to secure battery.
SERVICE
Any service required other than battery replacement,
cleaning , or calibration must be referred to the Myron L
Company. If you have any questions about this instrument,
its use, or a particular application, please contact the
Myron L Company.
STANDARD SOLUTIONS
Your DS Meter has been factory calibrated with the appropriate
NIST traceable Standard Solution. All Myron L
conductivity Standard Solution bottle labels show three
values: ppm 442™, ppm sodium chloride, and
conductivity in micromhos.
442: Unless otherwise specied, the calibration used for
all DS Meters is the “442” standard. The 442 Standard Solutions™
consist of the following salt ratios: 40% sodium
sulfate, 40% sodium bicarbonate, and 20% sodium
chloride. This salt ratio has conductivity characteristics
closely matching natural waters and was developed by the Myron L
Company over three decades ago.
Sodium Chloride: For every ppm 442 Standard
Solution, there is a ppm sodium chloride (NaCl) solution which will
have the same conductivity. The parts per million
of the equivalent NaCl solution is on each Standard
Solution label. Instruments calibrated to NaCl standards
are set using equivalent NaCl values.
Conductivity: All Myron L Company Standard Solutions are
traceable to the National Institute of Standards and Technology and
are within 1.00% of Potassium Chloride reference solutions. The
concentrations of the reference solutions are calculated from data in
the International
Critical Tables, Vol. 6.
RE-10 Range Extender
ACCESSORIES CONTINUED
RECOMMENDED STANDARD SOLUTIONS
PPM 442™ OR PPM NACL
MODEL SOLUTION
512T2 442-30
512T3 442-300
512T4 442-1500 with RE-10: 442-15,000
512T5 442-3000 with RE-10: 442-30,000
512T10 KCL-7000
MICROMHOS
MODEL SOLUTION
512M2 442-30
512M3 442-300
512M4 442-1500 with RE-10: 442-15,000
512M5 442-3000 with RE-10: 442-30,000
512M10 KCl-7000 with RE-10: 442-30,000
RANGE EXTENDER
The RE-10 Range Extender is a useful accessory for
testing high conductivity/ppm solutions beyond the normal
range of your DS meter (except 512T10). Inserting the RE10 into a sample-lled cell cup increases the maximum
range ten times. Use the Range Extender whenever the
reading is off the scale.
USING THE RE-10
1. Fill the cell cup three times to rinse it, but each time
insert the Range Extender to rinse it also.
2. Fill the cell cup with your sample. Push the Range
Extender into the cell cup, seating the O-ring seal.
3. Use and read the DS Meter in the normal manner.
Multiply the reading by 10.
4. For best accuracy, repeat the complete test with a fresh
sample.
5. When you’re done testing, remove the Range Extender.
Thoroughly rinse the cell cup and Extender with clean
water (preferably distilled or deionized) to eliminate
dried salts build-up. This is extremely important when
the instrument will be used to test high purity water.
CALIBRATING THE RE-10
1. Calibrate the meter (without RE-10) using the Standard
Solution.
2. Fill the cell cup with appropriate high conductivity
Standard Solution (442-15,000 or 442-30,000).
3. Insert RE-10 and press the black button. Multiply the
reading by 10 and compare it with the value on the
Standard Solution label. It they are not the same the
RE-10 must be recalibrated.
NOTE: DO NOT adjust the Conductivity Calibration
Control.
4. Adjust the white insert of the Extender as follows:
If the reading is too high – push or tap inward.
If the reading is too low – twist or pull outward with
pliers.
NOTE: The Range Extender is factory calibrated to a
particular meter. It should be recalibrated if it is to be used
with another meter.
PORTA PAK
Carrying Case for use with all
Myron L portable meters is
foam-lined and molded of sturdy
ABS plastic.
ORDERING
To order accessories contact your nearest stocking
distributor, or the Myron L Company.
Myron L DS Meters have a limited two year warranty. If your
instrument fails to operate properly, check the batteries and
calibration. If it still fails to function properly, return it prepaid to
the Myron L Company.
Faulty instruments may be returned to us without prior
permission.
METERS WITHIN TWO YEAR WARRANTY PERIOD:
Failures due to materials or workmanship will be repaired or
replaced (our option) without charge if returned freight prepaid.
If failure is deemed by the factory to have been caused by
abuse or tampering, the following procedure will apply.
INSTRUMENTS/CONTROLS OUT OF WARRANTY:
Diagnosis will be made and repairs completed, providing the
repair charges are $70.00 or less.
NOTE: Actual repair charges may be less than this amount.
Printed in the U.S.A.
WARRANTY & SERVICE
We will diagnose (but not repair) a returned meter and mail
an estimate of charges if ANY of the following apply:
1. Repair charges will be more than $70.00.
2. You specically request an estimate of required repairs and
charges.
3. The cost of required repairs exceeds one-half the list price of
a new instrument.
4. The instrument is over ten years old. Because of component
changes and improvements, such instruments may no longer
be repaired.
NOTE: Unrepaired meters are discarded unless you want them
returned to you. If so, there is currently a $35.00 charge per
unrepaired instrument to cover diagnosis and handling.
This warranty is limited to the repair or replacement of the
Myron L DS Meter only. The Myron L Company assumes no
other responsibility or liability.
Specications subject to change without notice
2450 Impala Drive
Carlsbad, CA 92010-7226
TELEPHONE: +1-760-438-2021
FAX: +1-760-931-9189
www.myronl.com
© Myron L Company 03/08
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