Myron L 3P User Manual

Page 10

Pour DI water in the sensor well and allow to stand for no more
than 4 hours (longer can deplete the reference solution and
damage the glass bulb). Retest.

If neither method is successful, sensor must be replaced.

"Drifting" can be caused by a film on the pH sensor bulb. Spray a liquid
cleaner such as Windex™ or Fantastic™ into the sensor well to clean it.
The sensor bulb is very thin and delicate. Do not scrub or wipe the
pH/ORP sensor.

Leaving high pH (alkaline) solutions in contact with the pH sensor for long
periods of time can damage it. Rinsing such liquids from the pH/ORP
sensor well and refilling well with Myron L Storage Solution, a saturated
KCl solution, pH 4 buffer, or a salty tap water will extend the sensor’s
useful life.

Samples containing chlorine, sulfur, or ammonia can "poison" any pH
electrode. If it is necessary to measure the pH of any such sample,
thoroughly rinse the sensor well with clean water immediately after taking

the measurement. Any sample element which will reduce (add an

electron to) silver, such as cyanide, will attack the reference electrode.

Replacement sensors are available only from the Myron L Company or its
authorized distributors.

Sensor
Body

pH/ORP Sensor
Top View

ORP
Electrode

pH Glass
Electrode

Reference
Junction
under Glass
pH Bulb

CARE and MAINTENANCE

Ultrameters should be rinsed with clean water after use. Solvents should
be avoided. Shock damage from a fall may cause instrument failure.

A. Temperature Extremes

Solutions in excess of 160°F/71°C should not be placed in the cell cup
area; this may cause damage. The pH sensor may fracture if the
Ultrameter temperature is allowed to go below -10°C (14°F). Care should
be exercised not to exceed rated operating temperature.
Leaving the Ultrameter in a vehicle or storage shed on a hot day can
easily subject the instrument to over 150°F. This will void the warranty.

B. Battery Replacement

Dry Instrument THOROUGHLY

Remove the four (4) bottom

screws. Open instrument carefully; it may be necessary to rock the
bottom slightly side to side to release it from the RS-232 connector.
Carefully detach battery from circuit board. Replace with 9 volt alkaline
battery. Replace bottom, ensuring the sealing gasket is installed in the
groove of the top half of case. Re-install screws, tighten evenly and
securely.

N O T E : Because of nonvolatile EEPROM circuitry, all data stored in
memory and all calibration settings are protected even during power loss
or battery replacement.

C. pH/ORP Sensor Replacement

Order model RPR. When ordering, be sure to include the model and
serial number of your instrument to ensure receiving the proper type.
Complete installation instructions are provided with each replacement
sensor.

D. Cleaning pH/ORP Sensors

The unique pH/ORP sensor in your Ultrameter is a nonrefillable
combination type which features a porous liquid junction. It should not be
allowed to dry out. If it does, the sensor can sometimes be rejuvenated
by first cleaning the sensor well with a liquid spray cleaner such as
Windex™ or Fantastic™ and rinsing well. Do not scrub or wipe the
pH/ORP sensor.

Then use one of the following methods:
1.

Pour a HOT salt solution ~60°C (140°F), preferably potassium
chloride (KCI) solution — HOT tap water with table salt (NaCl) will
work fine — in the sensor well and allow to cool. Retest.