1
The display will alternate between the final pH and temperature readings.
Note the readings for your records.
b. In LIVE mode
allow the pen to remain in solution while the LED flashes
slowly. The display will alternate between live pH and temperature
readings. Note the readings for your records. LIVE measurement will time
out after 1 minute OR push and release the push button to power the pen
off at any time during LIVE measurement.
IV. Calibration
The Myron L Company recommends calibrating twice a month, depending on
usage. However, you should check the calibration whenever measurements are not
as expected. 3-point Wet Calibration is most accurate and is recommended.
NOTE: If the measurement is NOT within calibration limits for any reason, “Error”
will display. Check to make sure you are using a proper pH buffer solution. If the
solution is correct, clean the glass bulb of the sensor with a cotton swab soaked in
isopropyl alcohol. Restart calibration.
NOTE: Small bubbles trapped in the sensor may give a false calibration. After
calibration is completed, measure the pH buffer solutions again to verify correct
calibration.
NOTE: If at any point during calibration, you do not submerge the sensor in solution
before the flashing slows, allow the pen to power off and start over.
A. Calibration Preparation
1. For maximum accuracy, fill 2 clean containers with each pH buffer. Arrange them
in such a way that you can clearly remember which is the rinse solution and
which is the calibration buffer. If you don’t have enough buffer, you can use
1 container of each buffer for calibration and 1 container of clean water for all
rinsing. Always rinse the pH sensor between buffer solutions.
2. Ensure the pH sensor is clean and free of debris.
B. 3-Point Calibration
Use pH 7, 4 and 10 buffers for 3-point calibration.
1. Thoroughly rinse the pen by submerging the sensor in pH 7 buffer rinse
solution and swirling it around.
2. Push and release the push button to turn the unit on.
3. Push and hold the push button. The display will alternate between “CAL”,
“FAC CAL”, “ºCºF TEMP”, “ModE SEL” and “ESC”.
4. Release the button when “CAL” displays. The display will indicate “CAL” and
the LED will flash rapidly.
5. While the LED flashes rapidly, dip the pen in pH 7 buffer calibration solution
so that the sensor is completely submerged.
6. While the LED flashes slowly, the pH calibration point will display along with
“CAL”. Swirl the pen around to remove bubbles, keeping the sensor submerged.
7. If the pH 7 calibration is successful, the display will indicate “SAVEd”, then
“PUSHCONT” will be displayed.
8. Push and release the push button to continue. The LED will begin flashing rapidly.
9. Repeat steps 5 through 8 with pH 4 and 10 buffer calibration solutions.
10. After the 3rd calibration point is successfully saved, the display will indicate
“SAVEd” and power off.
11. Verify calibration by retesting the calibration solution.
C. 2-Point Calibration
Use pH 7 and 4 or 10 buffers for 2-point calibration.
1. Thoroughly rinse the pen by submerging the sensor in pH 7 buffer rinse
solution and swirling it around.
2. Push and release the push button to turn the unit on.
3. Push and hold the push button. The display will alternate between “CAL”,
“FAC CAL”, “ºCºF TEMP”, “ModE SEL” and “ESC”.
4. Release the button when “CAL” displays. The display will indicate “CAL” and
the LED will flash rapidly.
5. While the LED flashes rapidly, dip the pen in pH 7 buffer calibration solution
so that the sensor is completely submerged.
6. While the LED flashes slowly, the pH calibration point will display along with
“CAL”. Swirl the pen around to remove bubbles, keeping the sensor submerged.
3
continued on page 4 ...
