Owner manual


VIII. CALIBRATION INTERVALS
There is no simple answer as to how often one should calibrate an
instrument. The Ultrameter II is designed to not require frequent
recalibration. The most common sources of error were eliminated in
the design, and there are no mechanical adjustments. Still, to ensure

standards occasionally.
A. 
On the average, we expect calibration need only be checked monthly
          

solutions will require more frequent intervals.
B. 
         
are making are minimal for your application, you can check less often.
Changes in conductivity calibration should be recorded in percent.

Calibration is purposely limited in the Ultrameter II to
±
10% for the
conductivity cell, as any change beyond that indicates damage, not
drift. Likewise, calibration changes are limited to
±

any change beyond that indicates the end of the sensor’s lifetime and
replacement is recommended.
C. 
 
with foaming cleaner or mild acid. Do not scrub inside the cell.
 Calibrate with solutions close to the measurements you make.
 
 
 
different solution selections and the resulting compensation,
 
 
 
temperature changes more than the instrument’s accuracy.
 
Allowing slow dissolving crystals to form in the cell
contaminates future samples.
 
 