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6) During the calibration process, press
key
to exit from
the calibration mode. The meter can
perform one-point, two-point and three-point calibration. Calibration guide icons appear on LCD.
5.5
Measuring pH
Screw off the KCL storage bottle, and put it aside (do not dump or spill the KCL solution). Prepare a cup of
distilled water, and rinse the electrode in it for a few seconds. Gently shake the probe to remove excess water,
and dry it with clean tissue paper or Kimwipes (DO NOT rub or wipe the probe, just use paper to dap off excess
water). Gently stir the electrode for a few seconds after it’s dipped into the test solution and then let it stand
still. Wait for the stable measurement (a smiley face icon appears and stays) and then record the
readings.
Please refer to Figure-8 for calibration and measurement process of the pH meter.
Figure-8 Calibration and measurement process of pH meter
Notes:
1)
This default 201T-F electrode will NOT give accurate and stable pH readings when testing
purified water such as distilled or deionized water. This because those water do not have
enough ions present for the electrode to function properly. To measure distilled or deionized
water’s pH, users need to use a specialized pH electrode with the meter such as LabSen
TM
803 Pure Water pH Electrode. Contact us at 1-614-285-3080 for more details. When testing
purified water like spring water or drinking water, it will take longer for the readings to get
stabilized (typically 3-5 minutes) because there is very few ions left to be detected by the
sensor in those purified water.
2)
Purified water such as distilled water and deionized water are recommended for only rinsing
the probe for the best result.
3)
The 201T-F pH Electrode is NOT suitable for testing high-temperature samples (>176˚F).
Testing high-temperature samples could cause permanent damage to the electrode. A
specialized electrode such as LabSen
TM
213 (up to 225˚F) should be used in this situation.
4)
The electrode housing is polycarbonate. When using cleaning solutions, take cautions on carbon
tetrachloride, trichlorethylene, tetrahydrofuran, acetone, etc., which will dissolve the housing and
invalidate the electrode.
After the 1
st
point
calibration is done,
press key to
enter the
measurement mode.
Press to turn
on the meter.
Press key to
enter the
calibration mode.
Submerge the
electrode in pH7.00
solution, press
key when icon
appears.
Sample
Test
1
st
point
calibration
2
n d
point
calibration
3
r d
point
calibration
After the 2
nd
point
calibration is done,
press key to
enter the
measurement mode.
After the 3
rd
point
calibration is done,
the meter enters the
measurement mode
automatically.
Submerge the
electrode in pH4.00
solution, press
key when icon
appears.
Submerge the
electrode in
pH10.01 solution,
press key when
icon appears.