Myron L 4P (includes Addendum 10-01) User Manual
Page 12
XII.
TROUBLESHOOTING CHART
Symptom
Possible Cause
Corrective
Action
No
display
, even though Battery weak or not connected.
Check connections or replace battery
measurement key pressed
(ref. Battery Replacement, pg. 20).
Unstable
1. Dirty electrodes.
1. Clean cell cup and electrodes (ref.
Conductivity
/
TDS
/
2.
T
est samples greater than
Cleaning Cell Cup, pg. 20).
Resistivity
readings
1 megohm.
2. Minimize test sample exposure to air
(ref. Measuring Resistivity
, pg. 10).
Unable to calibrate
Film or deposits on electrodes.
Clean cell cup and electrodes (ref.
Conductivity
/
TDS
Cleaning Cell Cup, pg. 20).
Resistivity
readings
1. Contamination from previous
1. Rinse cell cup more thoroughly before
much lower than expected sample or from pH sensor well.
measurement. Insure pH cap is snugly
2. Carbon dioxide in test sample.
in place.
2. See Measuring Resistivity
, pg. 10.
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XI.
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. 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. Cleaning Conductivity/TDS/Resistivity Cell Cup
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 a foaming non-abrasive household cleaner. Rinse out
the cleaner and your Ultrameter is ready for accurate measurements.
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