12
13
Notes
:
• In order to take accurate pH measurements, make sure that the
instrument is calibrated for pH before use.
• 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 clean the electrode thoroughly 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 931000
uses an electrode with a built-in temperature sensor and
therefore no additional temperature probe is needed.
To use the Automatic Temperature Compensation feature of
HI 8915
,
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. When the
temperature probe is disconnected, the pH reading will be compen-
sated at 25°C.
HI 8014 provides only for manual compensation.
ORP MEASUREMENTS (HI 8014 & HI 8915)
Connect an ORP electrode to the BNC socket on the top of the meter.
To enter the "mV" mode (ORP Oxidation Reduction Potential) turn the
instrument ON and select the mV mode.
To measure the mV of a sample submerge submerge the ORP
electrode tip (4 cm/1½") in the sample to be tested.
Allow a few minutes for the readings to stabilize. Also, see further on
for more information about REDOX measurements.
TEMPERATURE MEASUREMENTS (not for HI 8014)
Turn the instrument ON and press °C.
Make sure the temperature probe (for
HI 8915
) or the pH/°C
electrode (for
HI 931000
) is connected to the meter.
Dip the temperature probe or the pH/°C electrode into the sample
and allow the reading to stabilize (a couple of minutes).
For
HI 931000
, to display the measured tem-
perature, press and hold the °C key. When the
key is released, the display will return to the pH
reading.
HOLD FUNCTION (HI 8915 only)
The hold function is activated by the HOLD key. The measured value
is frozen on the display when this key is pressed. "S" symbol will
appear on the display to indicate the holding (storage) mode.
Press the HOLD key again to return to the normal mode.
AFTER MEASUREMENTS
After measurements switch the instrument off to save the battery,
disconnect the electrode from the meter and store it with a few drops
of
HI 70300
storage solution in the protective cap.
°C
