User Guide

23
To measure the mV of a sample 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 page 42 for more informa-
tion about REDOX measurements.
Note (for HI 8424 and HI 9622): the
resolution is 0.1 mV for values within the
±400mV range.
TAKING TEMPERATURE MEASUREMENTS (EXCEPT
HI 8014)
Turn the instrument ON and press °C (HI 8314 and HI 8915) or
RANGE (HI 8424 and HI 9622).
Make sure the temperature probe (for HI 8314,
HI 8915, HI 8424 and HI 9622) or pH/°C
electrode (for HI 9214 and HI 931000) is con-
nected to the meter.
Dip the temperature probe or the pH/°C elec-
trode into the sample and allow the reading to
stabilize (a couple of minutes).
For HI 9214: To display the measured tem-
perature, press and hold the °C button on the top of the meter.
When the button is released, the display will return to the pH
reading.
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.
4 cm
(1½
")
mV
ins
e
ru
m
n
s
ON
OFF
C
A
L
C
F
M
H
I 9
2
1
4
s
tic
k
p
H
m
e
te
r
ºC
ON
OFF
°C
RANGE
°C
34
pH
CAL
• The meter will request pH 4.01 or 10.01
buffer by showing "Er-4". This indicates
that the instrument is ready for the second
point calibration
Note: Only by pressing CFM, offset calibration and the date are
memorized.
• Rinse the electrode and temperature probe before immersing
them in a pH 4.01 or pH 10.01 calibration buffer. Stir gently
and wait a couple of minutes for thermal equilibrium. The display
will show the value of the temperature compensated buffer
solution.
• When "CAL" disappears and the meter displays "CFM" press CFM
to confirm the slope calibration.
The instrument is now calibrated and will remain calibrated even
when it is turned off.
Note: The meter will lose calibration if the battery is removed.
If for some reason the temperature probe is out of order, or a manual
temperature compensation is required, follow the procedure below:
• Make sure the temperature probe is detached.
• Press RANGE to select the temperature
mode.
• Place the tip of the pH electrode into the
pH 7.01 buffer and stir gently. Wait a
couple of minutes for thermal equilibrium.
• Note the temperature of the buffer with a
ChecktempC (or an accurate thermometer),
e.g. 20.0°C.
HI 7004
pH
CAL
pH
CFM
CFM
RANGE
°C