35
Single point Gain Calibration is complete. You may continue for the 3rd
point of calibration (2nd Gain) or exit by pressing any measurement key.
Exiting causes the value accepted for the buffer to be used for both acid
and base measurements.
To continue with 3rd point calibration, use basic buffer if acidic buffer
was used in the 2nd point, or vice-versa. Again, match the display to the
known buffer value as in Step 2 and continue with the following steps:
7.
Repeat Steps 3 through 6 using opposite buffer solution.
8.
Press
to accept 3rd point of calibration, which
completes the calibration procedure. Fill sensor well with
Myron L
®
Storage Solution and replace protective cap.
8.
ORP Calibration
ORP electrodes rarely give false readings without problems in the
reference electrode. For this reason, and because calibration solutions
for ORP are highly reactive and potentially hazardous, your Ultrameter
III
has an electronic ORP calibration. This causes the zero point on the
reference electrode to be set whenever pH 7 calibration is done.
9.
Temperature Calibration
Temperature calibration is not necessary in the Ultrameter
III
.
VIII.
CALIBRATION INTERVALS
There is no simple answer as to how often one should calibrate an
instrument. The Ultrameter
III
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
specified accuracy, any instrument must be checked against chemical
standards occasionally.
A. Suggested Intervals
On the average, we expect calibration need only be checked monthly
for the Conductivity, RES or TDS functions. The pH function should be
checked every 2 weeks to ensure accuracy. Measuring some solutions
will require more frequent intervals.
B. Calibration Tracking Records
To minimize your calibration effort, keep records. If adjustments you
are making are minimal for your application, you can check less often.
Changes in conductivity calibration should be recorded in percent.
Changes in pH calibration are best recorded in pH units.
Calibration is purposely limited in the Ultrameter
III
to ±10% for the conductivity
cell, as any change beyond that indicates damage, not drift. Likewise,
calibration changes are limited to ±1 pH unit, as any change beyond that
indicates the end of the sensor’s lifetime and replacement is recommended.
Summary of Contents for POOLPRO PS9TKB
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