PH150-C V2.1 07/09
4
Operation
Overview
When the electrode is placed in a solution, the main display and bargraph indicate the pH
reading while the lower display reads temperature. The bargraph is ‘center zero’, i.e. at pH
7 there is no display. As the pH rises, the bar moves from the center to the right. If the pH
drops, the bar moves from the center to the left.
Powering the ExStik™
The ExStik®uses four (4) CR2032 Lithium Ion Batteries (included). If the batteries are
weak, the ‘BAT’ indicator appears on the LCD. Press the ON/OFF key to turn the ExStik®
on or off. The auto power off feature shuts the ExStik®off automatically after 10 minutes of
inactivity to preserve battery life.
pH Calibration (1, 2, or 3 points)
1. Place the electrode into a buffer solution (4, 7, or 10). Press and hold the
CAL/RECALL key until “CAL” appears in the lower (temp.) display. When doing a 2
or 3 point calibration, calibrate with pH 7 buffer first, then follow with pH 4 then the pH
10 buffer.
2. The ExStik®automatically recognizes the solution and calibrates itself to that value
(the circled number on the LCD will match the solution). Note that if the solution is
more than 1 pH unit off from the L (4), M (7), or H (10) pH buffer, or if the electrode
slope is low, the ExStik®will assume an error and abort the calibration (End will be
displayed, and the unit will return to measure mode.)
3. During calibration, the pH reading flashes on the main display.
4. When calibration is complete, the ExStik®automatically displays “SA”, then “End” and
returns to normal operation mode.
5. The appropriate circled indicator (L, M, or H) appears on the LCD when a particular
calibration or series of calibrations has been completed within one power on cycle.
When the ExStik®is turned off, the circled indicator configuration and the calibration
data will be retained.
6. For a two or three point calibration, rinse in distilled water and repeat steps 1-4.
Note: Always turn the meter off and then on before calibrating to allow sufficient time to
complete the calibrations during one power cycle. If the meter auto powers off
during calibration the calibrations remain valid, but new calibrations will turn the
circled indicators off.
Changing the Displayed Temperature Units
To change the displayed temperature units (oC or oF):
1. With the unit OFF, press and hold down the CAL/RECALL button.
2. With the CAL/RECALL button depressed momentarily press the ON/OFF button.
When “SELF CAL” appears in the display release the CAL/RECALL button. The unit
will power on with temperature displayed in the new units.
Data Hold
Press the MODE/HOLD button to hold (freeze) a reading in the display. The meter will
enter the HOLD mode and the “HOLD” indicator will appear.
Note: This also stores the reading.
Press the MODE/HOLD button again to return to normal operation.
