Myron L 3P - Manual (Page 9)

VII. CHANGING from CENTIGRADE to FAHRENHEIT
1. Press .
2. Press to display the stored memory records.
3. Press repeatedly until you pass the memory “ CL
r
ALL ”
location”. The display will show a “ C ” or “ F ” (see Figures 6 & 7).
4. Press ; the display will change to the other unit.
5. Press ; all temperature readings are now in degrees last
shown.
N O T E : Units symbol “°F” is not displayed in Fahrenheit mode. Tempco
will still be shown in %/°C.
VIII. TOTAL RETURN to FACTORY SETTINGS “FAC SEL”
There may come a time when it would be desirable to quickly reset all the
recorded calibration values in the instrument back to the factory settings.
This might be to ensure all calibrations are set to a known value, or to give
the instrument to someone else free of adjustments or recorded data for
a particular application.
1. Press .
2. Press to display the stored memory records.
14
MR
MR
pH
Figure 6 Figure 7
CAL
MCLR
pH
MR
pH
3. Press repeatedly until
you pass the CL
r
ALL and the
C-F locations. The display will
show a “
FAC SEL ”
(see Figure 8).
4. Press to accept the resetting.
IX. CALIBRATION INTERVALS
There is no simple answer to how often one should calibrate an
instrument. The Ultrameter 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 has to be checked against chemical
standards occasionally.
A. Suggested Intervals
On the average, 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.
Calibration is purposely limited in the Ultrameter to ±1 pH unit because
more than that indicates the end of the sensor lifetime and it should be
replaced.
C. pH and ORP Practices to Maintain Calibration
1. Keep the sensor wet with Myron L Storage Solution.
2. Rinse away caustic solutions immediately after use.
ORP calibration solutions are not only caustic, but 5% is considered very
accurate. By using the pH zero setting (0 mV = 7 pH) for ORP and
precision electronics for detection, the Ultrameter delivers better
accuracy without calibration than a simpler instrument could using
calibration solutions.
15
MR
CAL
MCLR
Figure 8