Myron L 6P and 4P User Manual

Page 23

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 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:

Repeat steps 3 through 6 using opposite buffer solution.

Press

to accept 3rd point of calibration, which

completes the Calibration procedure. Fill sensor well with

Myron L Storage Solution and replace protective cap.

6. ORP Calibration (6P)

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 II

has an electronic ORP calibration. This causes the zero point on the

reference electrode to be set whenever pH 7 calibration is done.

7. Temperature Calibration

Temperature calibration is not necessary in the Ultrameter II.

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

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 (6P) function should be

checked every 2 weeks to ensure accuracy. Measuring some solutions

will require more frequent intervals.