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distilled water and blot the bulb dry. Be careful as the glass bulb is fragile. This procedure
will help remove contaminates from the electrode’s surface so that a true and proper
calibration can be done.
2. Dip the pH electrode into a pH 7 buffer solution.
Swish back and forth to dislodge air bubbles then
wait for the meter’s display to stabilize. Gently turn
the pH 7 calibration screw until the display reads pH
7.00. Do not turn calibration screw past its stop.
3. Remove from buffer solution and rinse the electrode
with distilled water and blot it dry with a clean cloth.
4. Dip the electrode into a pH 4 buffer solution. Swish back and forth to dislodge air bubbles
then wait for the meter’s display to stabilize. Gently turn the pH 4 calibration screw until the
display reads pH 4.00. Do not turn calibration screw past its stop.
5. Remove from buffer solution and rinse the electrode with distilled water and blot it dry with
a clean cloth.
6. Dip the pH electrode back into a pH 7 buffer solution. Swish back and forth to dislodge air
bubbles then wait for the meters display to stabilize. Gently turn the pH 7 calibration screw
until the display reads pH 7.00. Calibration process is complete.
Troubleshooting –
If the meter fails to calibrate pH properly after using the Rejuve it! cleaner on the electrode,
the pH electrode’s life may be over and will need to be replaced. Contact your local supply
store or CWP Instruments for replacement. Note: If the meter can’t be calibrated because the
calibration screws do not allow enough travel the pH calibration screws need to be
repositioned to center travel position before calibrating again. To do this, gently turn each pH
calibration screw counterclockwise until it stops and then back clockwise until it stops. This will
show you the full travel of the calibration screw. Now gently turn each calibration screw to the
center or to its halfway position and start the calibration steps 2-4 again. If this does not allow
for enough calibration screw travel during calibration, gently turn each calibration screw (from
full clockwise position) counterclockwise to the 1/4 position and calibrate the meter again
using steps 2-4. The starting position of the calibration screws is very important when
calibrating.
Temperature Measurement –
Dip the Temperature electrode into the solution for measuring. The monitor will display the
correct temperature after 10 minutes.
Calibration –
Dip the Temperature electrode and a waterproof thermometer into a solution for 10 minutes to
determine temperature. (Waterproof thermometers can easily be found at stores selling
aquarium supplies). After the pH electrode and thermometer have been submerged for 10
minutes, gently adjust the calibration screw on the meter to display the same temperature as
the thermometer.
Placement -
Place the Accurate pH 9.0 meter out of direct light, sprays of water and areas of high humidity.
Hang the meter on a wall using the holes located on the back of the meter. Plug the 9 volt
transformer into a surge protected outlet.
*The latest electronic components have been incorporated into this meter and will hold
calibration for long periods of time. The monitors are all calibrated before leaving the factory.