Hanna Instruments HI 9023 - Manual (Page 8)

15
ORP MEASUREMENTS (HI 9023C AND HI 9025C)
To enter the "mV" mode (ORP or ISE), turn the instrument ON and
press the RANGE key until the display changes to mV.
To measure the mV of a solution simply
submerge the ORP or ISE electrode tip (4cm/
1½") into the sample to be tested. Allow a
few minutes for the readings to stabilize. See
also "Taking REDOX Measurements" section at
page 29.
TEMPERATURE MEASUREMENTS (HI 9023C,
HI 9023CN, HI 9024C, HI 9025C AND HI 9210N):
Taking a temperature measurement is very easy. Turn the instrument
ON and press the RANGE key to enter temperature mode.
For HI 9023C, HI 9024C and HI 9025C, dip the liquid/general
purpose temperature probe HI 7669/2W into the sample. For
HI 9023CN and HI 9210N, simply dip the pH/ C electrode which
contains the temperature sensor. Then allow a couple of minutes for
the reading to stabilize.
Note: You can also calibrate the offset point of the HI 9210N tem-
perature sensor, if needed. For this purpose, immerse the pH/
C electrode in a solution at a known temperature. Then turn
the #5 trimmer (see page 10) until the temperature dis-
played on the LCD is that of the solution.
ON/OFF
ON/OFF
4 cm (1½
")
RANGE
RANGE
16
It is recommended to calibrate the instrument frequently, especially if
high accuracy is required.
The instrument should be recalibrated for pH:
a) Whenever the pH electrode or temperature probe is replaced.
b) At least once a month.
c) After testing aggressive chemicals.
d) Whenever the batteries have been replaced.
e) If greater accuracy is required.
PREPARATION
Pour small quantities of pH 7.01 and pH 4.01 solution into two clean
beakers.
For accurate calibration use two beakers for each buffer solution, the
first one for rinsing the electrode and the second one for calibration.
This way contamination of buffer is minimized.
To obtain accurate readings, use pH 7.01 and pH 4.01 buffers if you
are going to measure acidic samples, or pH 7.01 and pH 10.01 for
alkaline measurements.
PROCEDURE FOR HI 9023C AND HI 9023CN:
• Make sure that the meter is in the pH mode.
• Remove the protective cap from the elec-
trode, rinse it with some pH 7.01 solution,
then immerse the pH electrode and tem-
perature probe (HI 9023C
HI 9023C HI 9023C HI 9023C HI 9023C) or the pH/ C
electrode (HI 9023CN HI 9023CN HI 9023CN HI 9023CN HI 9023CN) into pH 7.01 buffer
solution and stir gently and wait for the
reading to stabilize.
HI 7004 HI 7007
HI 7004
HI 7007
CALIBRATION
HI 7007
RINSE
pppppH CALIBRATION H CALIBRATION H CALIBRATION H CALIBRATION H CALIBRATION
HI 7007