User Guide

21
For HI 9214 and HI 931000: Simply sub-
merge the tip (4cm/1½") of the combination
pH/temperature electrode in the sample.
Turn the instrument ON. Select the pH mode
(HI 8314 and HI 8915 only) or press the
RANGE key until the display changes to pH
(HI 8424 and HI 9622 only).
Shake the electrode briefly and allow a couple
of minutes for the reading to stabilize. The
display will show the pH value compensated
for temperature.
For HI 9214 and HI 931000:
After submerging the electrode in the sample,
wait until the stability indicator "∆" stops
blinking. The pH readout is also temperature
compensated.
In order to take accurate pH measurements, make sure that the
instrument is calibrated for pH before use (see page 25).
For a faster response time when using refillable electrodes,
unscrew the refill hole cap.
If measurements are taken in different samples successively, it is
recommended to rinse clean the electrode thoroughly in between
samples to eliminate cross-contamination. After cleaning, rinse the
electrode with some of the sample to be measured.
TEMPERATURE COMPENSATION
The pH reading is directly affected by temperature. In order for the
meter to measure the pH accurately temperature must be taken into
consideration.
HI 9214 and HI 931000 use an electrode with a built-in tempera-
ture sensor and therefore no additional temperature probe is needed.
To use the Automatic Temperature Compensation feature of HI 8314,
HI 8424, HI 8915 and HI 9622, submerge the temperature probe
into the sample as close to the electrode as possible and wait for a
couple of minutes. The displayed pH reading is compensated for the
temperature variance.
If you know the temperature of the sample you can also manually
4 cm
(1½
")
RANGE
pH
∆
36
TEMPERATURE CALIBRATION
HI 8314, HI 8915, HI 8424, HI 9214, HI 931000 and HI 9622
have been accurately precalibrated for temperature at the factory.
For optimum accuracy, it is recommended that you have your pH
meter recalibrated for temperature at least once a year.
Contact your Dealer or the nearest Hanna Customer Service Center for
more information.
mV OUTPUT
It is possible to attach the HI 8915 to a recorder or plotter using the
mV output sockets.
pH, mV and °C readings can be transmitted through the output
sockets at a voltage that proportionally matches the displayed value.
For example, when the meter reads 2.00, 7.00 or 12.00 pH, it emits
a 200, 700 or 1200 mV signal, respectively.
This makes it unnecessary to use conversion tables and charts.
The output signals for the three measurement ranges of the meter are
100 mV for every pH unit, 1mV for every mV unit and 10 mV for
every degree centigrade.