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• To return to normal
Measure
mode press .
Note: If the reading is out of range, “-----” will be displayed on the LCD.
Outside Cal Range feature warns the user if the current reading is
out of the calibrated area. The calibrated area is that part of the pH
range in which the calibration point assures an accurate reading. If
the reading is taken out of the calibration area, the “Outside Cal
Range” message will start blinking on the LCD. The calibrated area
is calculated in according with the pH resolution used during the
reading. To avoid having this message, the calibration points have
to be well distributed in the desired measurement range.
If measurements are taken successively in different samples, it is
recommended to rinse the electrode thoroughly with deionized
water or tap water and then with some of the next sample to
prevent cross-contamination and to condition the electrode before
immersing it into the sample solution.
The pH reading is affected by temperature. In order to measure the pH accurately, the temperature effect must
be compensated. To use the Automatic Temperature Compensation (ATC) feature, connect and submerge the
HI 7662-T temperature probe into the sample as close as possible to the electrode and wait for a few seconds.
If the temperature of the sample is known, Manual Temperature Compensation (MTC) can be performed by
disconnecting the temperature probe.
Notes: • For single channel pH measurements (HI 4221) “MTC” or “ATC” indicators will be displayed on the LCD,
while for dual channel pH measurements (HI 4222) “MTC” or “ATC1”/”ATC2” indicators will be
displayed, depending on the temperature compensation mode and selected channel.
• For mV/Rel mV measurements “NO PROBE” or “TEMP” indicators will be displayed on the LCD (HI 4221
only), respectively “NoProbe” or “TEMP1”/”TEMP2” indicators (HI 4222 only) for mV/Rel mV/ISE
measurements, depending on the temperature compensation mode and selected channel.
• When in MTC mode, the temperature can be modified by pressing
for
pH Measure
mode and
for
mV
/
Rel mV Measure
mode (HI 4221 only) if the Reading Mode option is Direct (HI 4222
only). The temperature value can be ajusted with
or from –20.0 ºC to 120.0 ºC. Press
to save the new temperature value or press to return to
Measure
mode.
• When in ATC mode for pH, respectively TEMP for mV/Rel mV, “-----” will be displayed on the LCD if
the measured temperature is under or over temperature range (–20.0 ºC to 120.0 ºC).