Myron L TH1 - Manual (Page 18)

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NOTE: If the “Acd” and “bAS” indicators are blinking, the unit is indicating an
error and needs either an acid or base solution present in the sensor well.
3. Rinse sensor well 3 times with acid or base buffer solution.
4. Refill sensor well again with same buffer solution.
5. Press or until display agrees with buffer value.
6. Press to accept 2nd point of calibration. Now the display
indicates the next type of buffer to be used.
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 base buffer if acid 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 5 using opposite buffer solution.
8. Press to accept 3rd point of calibration, which completes
the Calibration procedure. Fill sensor well with Myron L pH
Sensor Storage Solution and replace protective cap.
VIII. CALIBRATION INTERVALS
There is no simple answer as to how often one should calibrate
an instrument. The TechPro 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
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 or TDS functions. The pH (TPH1 & TH1) function
should be checked every 2 weeks to ensure accuracy. Measuring some
solutions will require more frequent intervals.