User guide

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 AR1 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 (LO BATT)
Dry Instrument THOROUGHLY. Remove the four bottom screws.
Open instrument. 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. Tighten screws evenly
and securely. (Do NOT overtighten)
C. Cleaning Cell Cup
The 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 AR1 is
ready for accurate measurements.
Possible Cause
Corrective ActionSymptom
Check connections or replace battery.
(ref. Battery Replacement, pg. 12).
Clean cell cup and electrodes.
(ref. Cleaning Cell Cup, pg. 12)
Clean cell cup and electrodes (ref.
Cleaning Cell Cup, pg. 12).
Battery weak or not connected.
Film or deposits on electrodes.
Film or deposits on electrodes.
No display, even though
measurement key pressed.
Unstable Conductivity or
TDS readings.
Unable to calibrate
Conductivity or TDS.
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