OPERATIONAL GUIDE
CE DECLARATION OF CONFORMITY
IST8314R1 06/05
INITIAL PREPARATION
The meter is supplied complete with a 9V battery. Remove the
battery compartment cover on the back of the meter, install the
battery while paying attention to its polarity.
Always remove the electrode protective cap before taking any
measurements. If the electrode has been left dry, soak the tip in
HI 70300
storage solution for half an hour to reactivate it.
Connect the pH electrode to the DIN connector on the top of the
instrument.
Turn the meter ON by pressing the ON/OFF key.
TAKING pH MEASUREMENTS
To take a pH measurement simply sub-
merge the electrode tip (at least 4cm/1½")
into the sample to be tested.
Select the pH mode. Shake briefly and wait
a couple of minutes for the reading to
stabilize. The display will show the pH
value automatically compensated for tem-
perature variations.
In order to take accurate pH measurements, make sure that the
instrument has been calibrated for pH before use.
If measurements are taken in different samples successively, it is
recommended to rinse the electrode thoroughly to avoid cross-
contamination. After cleaning, rinse the electrode with some of
the sample to be measured.
TAKING ORP MEASUREMENTS
Connect the ORP electrode to the DIN connector on the top of the
meter.
To enter the "mV" mode (ORP, Oxidation
Reduction Potential) turn the instrument
ON and press the mV key.
To take the mV measurement of a sample submerge the ORP
electrode tip (at least 4 cm/1½") into the solution to be tested.
Wait a few minutes for the reading to stabilize.
TAKING TEMPERATURE MEASUREMENTS
Turn the instrument ON, press the °C key
and allow the reading to stabilize.
°C
For greatest accuracy, frequent calibration of the instrument is
recommended. The instrument should be recalibrated for pH:
a) whenever the pH electrode is replaced
b) at least once a month
c) after testing aggressive chemicals
d) where extreme accuracy is required
PREPARATION
Pour small quantities of pH7.01 (
HI 7007
) and pH4.01
(
HI 7004
) buffer solutions into two clean beakers.
For accurate calibration use two beakers for each buffer solution,
the first one for rinsing the tip of the electrode, the second one for
calibration. In this way contamination of the buffers is minimized.
To obtain accurate readings, use pH7.01 (
HI 7007
) and pH4.01
(
HI 7004
) buffers if you are going to measure acidic samples, or
pH7.01 (
HI 7007
) and pH10.01 (
HI 7010
) for alkaline mea-
surements.
If you need to calibrate the meter to NIST standards, use
pH6.86 (
HI 7006
) instead of pH7.01 and pH9.18 (
HI 7009
)
instead of pH10.01.
PROCEDURE
• Connect the pH electrode and switch the meter ON.
• Remove the protective cap from the electrode, rinse the tip
with some pH7.01 solution, then immerse the electrode into
a pH7.01 buffer solution; stir gently and wait a couple of
minutes for thermal equilibrium to be reached.
Note:
the electrode should be submerged approximately 4 cm
(1½") into the solution.
• Press the °C key to
display the tempera-
ture of the buffer (e.g.
20°C).
• Press the pH key to read pH values. Stir
gently and wait for a couple of minutes.
• Adjust the STD trimmer on the lower left of the front panel
until LCD shows the pH value at the noted temperature.
pH CALIBRATION
•
Rinse and immerse the pH electrode in pH4.01 or pH10.01
buffer (2
nd
calibration point) and stir gently.
• Wait a couple of minutes and adjust the SLOPE trimmer on
the lower right of the front panel until the LCD shows the pH
value at the noted temperature.
The pH calibration is now complete.
pH
OFFSET
pH
SLOPE
pH
BATTERY REPLACEMENT
When the battery becomes weak, the
meter displays a blinking additional deci-
mal point on the left side of the LCD.
When the low battery indicator appears only a few hours of
battery life is remaining. A low battery level may also result in
unreliable measurements. It is recommended to replace the
battery immediately.
Unscrew the 3 screws on the back of the meter, remove the
battery cover and replace the battery while paying attention
to its polarity.
Replacement must only take place in a non-hazardous area
using an alkaline 9V battery.
ACCESSORIES
HI 1217D
Double junction, gel filled pH-electrode with built-
in temperature sensor, DIN connector and 1 m
(3.3’) cable
HI 3618D
Platinum ORP-electrode with built-in temperature
sensor, DIN connector and 1 m (3.3’) cable
HI 4619D
Gold ORP-electrode with built-in temperature sen-
sor, DIN connector and 1 m (3.3’) cable
HI 7004M
pH 4.01 buffer solution, 230 mL bottle
HI 7007M
pH 7.01 buffer solution, 230 mL bottle
HI 7010M
pH 10.01 buffer solution, 230 mL bottle
HI 70300M
Storage solution, 230 mL bottle
HI 7061M
General cleaning solution, 230 mL bottle
HI 7091M
Reducing pretreatment solution, 230 mL bottle
HI 7092M
Oxidizing pretreatment solution, 230 mL bottle
HI 731326
Calibration screwdriver (20 pcs)
HI 76405
Electrode holder
°C
ºC
TEMP pH VALUES
°C 4.01 7.01 10.01
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
4.01
4.00
4.00
4.00
4.00
4.01
4.02
4.03
4.04
4.05
4.06
4.07
4.09
4.11
4.12
7.13
7.10
7.07
7.04
7.03
7.01
7.00
6.99
6.98
6.98
6.98
6.98
6.98
6.99
6.99
10.32
10.24
10.18
10.12
10.06
10.01
9.96
9.92
9.88
9.85
9.82
9.79
9.77
9.76
9.75
pH VS. TEMPERATURES
