4
5
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 7 with pH 4 or 10 buffer calibration solution.
10. Leave the pen in the same buffer solution until the unit powers off. The
offset will be applied to the remaining calibration point.
11. Verify calibration by retesting the calibration solution.
D. 1-Point Calibration
Use pH 7, 4 or 10 buffer for 1-point calibration.
1. Thoroughly rinse the pen by submerging the sensor in pH 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 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 calibration is successful, the display will indicate “SAVEd”, then
“PUSHCONT” will be displayed. “PUSHCONT” will not display if you
calibrated 4 or 10.
8. Leave the pen in the same buffer solution until the unit powers off. The
offset will be applied to the remaining calibration points.
9. Verify calibration by retesting the calibration solution.
E. Factory Calibration
When pH buffers are not available, the PT2 can be returned to factory default
calibration using the FAC CAL function. This will erase any stored wet calibration.
NOTE: default factory calibration resets the electronics only and does NOT take
the condition of the sensor into consideration.
To return your unit to factory calibration:
1. Push and release the push button.
2. Push and hold the push button. The display will alternate between “CAL”,
“FAC CAL”, “ºCºF TEMP”, “ModE SEL” and “ESC”.
3. Release the button when “FAC CAL” displays. The display will alternate
between “PUSHnHLD” and “FAC CAL”.
4. Push and hold the push button. “SAVEd FAC” displays indicating the pen
has been reset to its factory calibration.
MAINTENANCE
I. Battery Replacement
The PT2 display has a battery indicator that depicts the life remaining in the battery.
When the indicator icon is at 3 bars, the battery is full. When the indicator icon falls
to 1 bar, replace the battery with an N type battery.
1. In a CLEAN DRY environment unscrew the pen cap in a counter-clockwise
motion.
2. Slide the cap and battery housing out of the pen.
3. Remove the depleted battery out of its housing.
4. Insert a new battery into the battery housing oriented with the negative end
touching the spring.
5. Align the groove along the battery housing with the guide bump inside the pen
case and slide the battery housing back in.
6. Screw the pen cap back on in a clockwise direction. Do not overtighten.
Battery Housing
Battery
+
_
Align groove in battery housing with guide
bump in pen case.
Pen Case
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