Myron L MLJ-PS6SI, Operation Manual

Page: 21 / 56

17
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.
4. 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 P
ool
P
ro
has an electronic ORP calibration. This causes the zero point on the
reference electrode to be set whenever pH 7 calibration is done.
5. Temperature Calibration
Temperature calibration is not necessary in the P
ool
P
ro
.
VIII. CALIBRATION INTERVALS
There is no simple answer as to how often one should calibrate an
instrument. The P
ool
P
ro
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, MIN/SALT 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.