Myron L 512M10 - Manual (Page 3)

1. Remove the bottom cover using fingernails 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.
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.
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 films of oil and dirt. However, if very dirty
samples – particularly scaling types – are allowed to dry
in the cell cup, a film will build up. This film reduces
accuracy. When there are visible films 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.
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 specified, 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.
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