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pH Measurement and Temperature Compensation
1. Use
the
pH/mV
button to select the pH mode. The unit of measure appears on the LCD.
2. Connect the pH electrode to the meter and place the sensor end in the solution under test.
3. For automatic temperature compensation, connect the temperature probe to the meter (display
will read ATC) and place the sensor end in the solution about 1/3 of the way below the solution
surface. The temperature reading of the solution appears on the bottom of the LCD. When the
temperature of a sample differs from a buffer solution temperature, allow enough time for the
electrode to stabilize to the sample's temperature.
4. For manual temperature compensation, a temperature sensor is not connected to the meter.
(MANUAL is displayed). A manual thermometer will be needed to determine the solution
temperature first.
Adjust the meter’s temperature display with the
up/down
buttons so that the displayed
temperature matches the temperature of the solution.
5. To change the unit of measure for temperature (C to F or F to C), turn the unit OFF then
complete the following steps. Press and continue to hold the
pH/mV
button and then press and
hold the
Power
button. Release the
pH/mV
button first then release the
power
button. The LCD
reflects the unit of measure.
6. Read the pH measurement on the main display. An out of range reading is indicated by dashes
( ----- ).
7. When the test is complete, unplug the electrode and rinse it in distilled water.
8. Place approx. 1 ml of pH 4 solution in the wetting cap before replacing it.
mV (ORP) Measurements
1. Note that calibration is not required for mV (ORP) measurements.
2. Use
the
pH/mV
button to select the mV mode. The display will reflect the unit of measure.
3. Remove the wetting cap from the ORP electrode and connect the cable via the BNC meter
connection.
4. Rinse the ORP electrode and place it into a sample solution. When the LCD stabilizes it will
read the redox potential of the sample in millivolts.
5. When sampling is complete, unplug and rinse the electrode. Place a small portion (1ml) of
distilled water in the wetting cap. Place the cap over the electrode.
25-Reading Measurement Storage
1. Press
the
STORE/RECALL
button to store the current reading. Press each time a reading is to
be stored.
2. If an attempt is made to store more than 25 readings, the stored readings (starting with the first
reading) will be overwritten.
3. To recall readings, press and hold the
STORE/RECALL
button until the ‘RECALL’ icon appears
on the LCD. Use the up/down arrow buttons to scroll through the stored readings. Note that
‘NULL’ is displayed if there are no readings in memory.
4. To exit this mode, press and hold the
STORE/RECALL
button until the ‘RECALL’ icon
disappears.
5. To clear the contents of the memory press and hold the
up
and the
down
arrow buttons while
powering the meter on until the ‘CLr’ icon appears on the LCD. All 25 locations will be erased.
Note: Readings are stored in non-volatile memory (saved when the meter is turned off).
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