Myron L 6Pfc and 4P - Manual (Page 36)

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XVII. CARE and MAINTENANCE
Ultrameter IIs 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 71°C/160°F should not be placed in the cell
cup area; this may cause damage. The pH sensor may fracture if the
Ultrameter II temperature is allowed to go below 0°C/32°F. Care should
be exercised not to exceed rated operating temperature.
Leaving the Ultrameter II in a vehicle or storage shed on a hot day
can easily subject the instrument to over 66°C/150°F. This will void the
warranty.
B. Battery Replacement
Dry Instrument ThOROUGhLy. Remove the four (4) bottom screws.
Open instrument carefully. 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.
NOTE: Because of nonvolatile EEPROM circuitry, all data stored in
memory and all calibration settings are protected even during power
loss or battery replacement. However, loss of time and date may occur if
battery is removed for longer than 3 minutes (180 seconds).
C. pH/ORP Sensor Replacement (6Pfc)
Order model RPR. When ordering, be sure to include the model and
serial number of your instrument to ensure receipt of the proper type.
Complete installation instructions are provided with each replacement
sensor.
D. Cleaning Sensors
1. Conductivity/TDS/Resistivity
The conductivity cell cup should be kept as clean as possible. Flushing
with clean water following use will prevent buildup on electrodes.
However, if very dirty samples — particularly scaling types — are
allowed to dry in the cell cup, a film will form. This film reduces accuracy.
When there are visible films of oil, dirt, or scale in the cell cup or on the
electrodes, use isopropyl alcohol or a foaming non-abrasive household
cleaner. Rinse out the cleaner and your Ultrameter II is again ready for
accurate measurements.
2. pH/ORP (6Pfc)
The unique pH/ORP sensor in your Ultrameter II is a nonrefillable
combination type that features a porous liquid junction. It should not