Hanna Instruments hi 98140 User Manual
11
Connect the pH electrode with the built-in tempera-
ture sensor to the meter and press ON/OFF to
power on the instrument. The meter automatically
checks that the stored calibration data correspond to the connected
electrode. The pH range will be automatically set.
If the pH electrode is not connected the LCD will display the "no
probe" message and then dashed lines in place of the readings.
For greatest accuracy, it is recommended to set
the Calibration alarm time-out to the value
appropriate to your specific use and calibrate
the meter as soon as the "DATE" warning
symbol blinks on LCD (see GLP section).
To take pH measurements, simply submerge
the bottom 4 cm (1½") of the electrode in
the solution to be tested and stir gently.
Allow for the reading to stabilize.
The temperature is displayed in the lower LCD.
The pH reading is automatically temperature compensated (ATC).
If the meter displays "----" it means that the reading is out of range.
A blinking reading means that the electrode is "dead".
By continuously pressing the RANGE key the
following information will be displayed on
the upper LCD:
• mV reading (HI98150 only)
ture sensor to the meter and press ON/OFF to
power on the instrument. The meter automatically
checks that the stored calibration data correspond to the connected
electrode. The pH range will be automatically set.
If the pH electrode is not connected the LCD will display the "no
probe" message and then dashed lines in place of the readings.
For greatest accuracy, it is recommended to set
the Calibration alarm time-out to the value
appropriate to your specific use and calibrate
the meter as soon as the "DATE" warning
symbol blinks on LCD (see GLP section).
To take pH measurements, simply submerge
the bottom 4 cm (1½") of the electrode in
the solution to be tested and stir gently.
Allow for the reading to stabilize.
The temperature is displayed in the lower LCD.
The pH reading is automatically temperature compensated (ATC).
If the meter displays "----" it means that the reading is out of range.
A blinking reading means that the electrode is "dead".
By continuously pressing the RANGE key the
following information will be displayed on
the upper LCD:
• mV reading (HI98150 only)
The mV scale is autoranging, when the
reading is outside ±600mV the decimal
point automatically disappears.
reading is outside ±600mV the decimal
point automatically disappears.
• Time
• Day - Month
• Year
Pressing RANGE again, the meter returns to pH reading.
• Day - Month
• Year
Pressing RANGE again, the meter returns to pH reading.
Note: When date or time is displayed, it is possible to change them
pressing ALT and FNC with no need to enter setup mode.
Note: If measurements are taken successively in different samples, it
is recommended to rinse the electrode thoroughly with deion-
ized water or, if not available, tap water first and then with
some of the next sample to condition the electrode before
immersing it in the sample.
ized water or, if not available, tap water first and then with
some of the next sample to condition the electrode before
immersing it in the sample.
TAKING pH MEASUREMENTS