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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 ﬁ lms of oil

and dirt. However, if very dirty samples—particularly scaling

types—are allowed to dry in the cell cup, a ﬁ lm will build up. This

ﬁ lm reduces accuracy. When there are visible ﬁ lms of oil, dirt

or scale in the cell cup or on the electrode, scrub them lightly

with a small brush and household cleanser such as Comet™ or

Windex™. Rinse out the cleanser and the meter is now ready

for accurate measurements.

WATER INSIDE THE METER

Your Myron L PoolMeter 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 in order 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, or 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 getting 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 service.

SERVICE

Any service required other than battery replacement, cleaning

or calibration must be referred to the Myron L Company.

Additionally, if you have any questions about this instrument,

its use, or a particular application, please contact the Myron L

Company directly (see back cover for contact information).

ACCESSORIES

STANDARD SOLUTIONS

442™: Unless otherwise speciﬁ ed, your PoolMeter has been

factory calibrated with the TDS 442 Standard Solution. 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 almost four decades ago.

Sodium Chloride: For every ppm 442 Standard Solution,

there is a ppm sodium chloride (NaCI) solution that will have

the same conductivity. The parts per million of the equivalent

NaCI solution is on each Standard Solution label. Instruments

calibrated to NaCI standards are set using equivalent NaCI

values.

All Myron L Company Standard Solutions are traceable to the

National Institute of Standards and Technology (NIST) and are

within 1.00% of reference solutions. The concentrations of the

reference solutions are calculated from data in the International

Critical Tables, Vol. 6.

All Myron L conductivity Standard Solution bottle labels

show three values: ppm 442, ppm sodium chloride, and

conductivity in micromhos.